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Merge pull request 'NLnet task 3' (#667) from nlnet-task3 into next-0.10

Browse source 
Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/garage/pulls/667
This commit is contained in:
Alex 2024-01-11 10:58:08 +00:00
commit 8a6ec1d611
41 changed files with 3284 additions and 1668 deletions
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143
doc/drafts/admin-api.md
View file

@ -69,8 +69,8 @@ Example response body:
```json
{
"node": "ec79480e0ce52ae26fd00c9da684e4fa56658d9c64cdcecb094e936de0bfe71f",
"garageVersion": "git:v0.9.0-dev",
"node": "b10c110e4e854e5aa3f4637681befac755154b20059ec163254ddbfae86b09df",
"garageVersion": "v0.10.0",
"garageFeatures": [
"k2v",
"sled",
@ -81,83 +81,92 @@ Example response body:
],
"rustVersion": "1.68.0",
"dbEngine": "LMDB (using Heed crate)",
"knownNodes": [
"layoutVersion": 5,
"nodes": [
{
"id": "ec79480e0ce52ae26fd00c9da684e4fa56658d9c64cdcecb094e936de0bfe71f",
"addr": "10.0.0.11:3901",
"id": "62b218d848e86a64f7fe1909735f29a4350547b54c4b204f91246a14eb0a1a8c",
"role": {
"id": "62b218d848e86a64f7fe1909735f29a4350547b54c4b204f91246a14eb0a1a8c",
"zone": "dc1",
"capacity": 100000000000,
"tags": []
},
"addr": "10.0.0.3:3901",
"hostname": "node3",
"isUp": true,
"lastSeenSecsAgo": 9,
"hostname": "node1"
"lastSeenSecsAgo": 12,
"draining": false,
"dataPartition": {
"available": 660270088192,
"total": 873862266880
},
"metadataPartition": {
"available": 660270088192,
"total": 873862266880
}
},
{
"id": "4a6ae5a1d0d33bf895f5bb4f0a418b7dc94c47c0dd2eb108d1158f3c8f60b0ff",
"addr": "10.0.0.12:3901",
"id": "a11c7cf18af297379eff8688360155fe68d9061654449ba0ce239252f5a7487f",
"role": null,
"addr": "10.0.0.2:3901",
"hostname": "node2",
"isUp": true,
"lastSeenSecsAgo": 1,
"hostname": "node2"
"lastSeenSecsAgo": 11,
"draining": true,
"dataPartition": {
"available": 660270088192,
"total": 873862266880
},
"metadataPartition": {
"available": 660270088192,
"total": 873862266880
}
},
{
"id": "23ffd0cdd375ebff573b20cc5cef38996b51c1a7d6dbcf2c6e619876e507cf27",
"addr": "10.0.0.21:3901",
"id": "a235ac7695e0c54d7b403943025f57504d500fdcc5c3e42c71c5212faca040a2",
"role": {
"id": "a235ac7695e0c54d7b403943025f57504d500fdcc5c3e42c71c5212faca040a2",
"zone": "dc1",
"capacity": 100000000000,
"tags": []
},
"addr": "127.0.0.1:3904",
"hostname": "lindy",
"isUp": true,
"lastSeenSecsAgo": 7,
"hostname": "node3"
"lastSeenSecsAgo": 2,
"draining": false,
"dataPartition": {
"available": 660270088192,
"total": 873862266880
},
"metadataPartition": {
"available": 660270088192,
"total": 873862266880
}
},
{
"id": "e2ee7984ee65b260682086ec70026165903c86e601a4a5a501c1900afe28d84b",
"addr": "10.0.0.22:3901",
"id": "b10c110e4e854e5aa3f4637681befac755154b20059ec163254ddbfae86b09df",
"role": {
"id": "b10c110e4e854e5aa3f4637681befac755154b20059ec163254ddbfae86b09df",
"zone": "dc1",
"capacity": 100000000000,
"tags": []
},
"addr": "10.0.0.1:3901",
"hostname": "node1",
"isUp": true,
"lastSeenSecsAgo": 1,
"hostname": "node4"
"lastSeenSecsAgo": 3,
"draining": false,
"dataPartition": {
"available": 660270088192,
"total": 873862266880
},
"metadataPartition": {
"available": 660270088192,
"total": 873862266880
}
}
],
"layout": {
"version": 12,
"roles": [
{
"id": "ec79480e0ce52ae26fd00c9da684e4fa56658d9c64cdcecb094e936de0bfe71f",
"zone": "dc1",
"capacity": 10737418240,
"tags": [
"node1"
]
},
{
"id": "4a6ae5a1d0d33bf895f5bb4f0a418b7dc94c47c0dd2eb108d1158f3c8f60b0ff",
"zone": "dc1",
"capacity": 10737418240,
"tags": [
"node2"
]
},
{
"id": "23ffd0cdd375ebff573b20cc5cef38996b51c1a7d6dbcf2c6e619876e507cf27",
"zone": "dc2",
"capacity": 10737418240,
"tags": [
"node3"
]
}
],
"stagedRoleChanges": [
{
"id": "e2ee7984ee65b260682086ec70026165903c86e601a4a5a501c1900afe28d84b",
"remove": false,
"zone": "dc2",
"capacity": 10737418240,
"tags": [
"node4"
]
}
{
"id": "23ffd0cdd375ebff573b20cc5cef38996b51c1a7d6dbcf2c6e619876e507cf27",
"remove": true,
"zone": null,
"capacity": null,
"tags": null,
}
]
}
]
}
```

2
src/api/admin/api_server.rs
View file

@ -279,7 +279,7 @@ impl ApiHandler for AdminApiServer {
Endpoint::GetClusterLayout => handle_get_cluster_layout(&self.garage).await,
Endpoint::UpdateClusterLayout => handle_update_cluster_layout(&self.garage, req).await,
Endpoint::ApplyClusterLayout => handle_apply_cluster_layout(&self.garage, req).await,
Endpoint::RevertClusterLayout => handle_revert_cluster_layout(&self.garage, req).await,
Endpoint::RevertClusterLayout => handle_revert_cluster_layout(&self.garage).await,
// Keys
Endpoint::ListKeys => handle_list_keys(&self.garage).await,
Endpoint::GetKeyInfo {

4
src/api/admin/bucket.rs
View file

@ -122,7 +122,7 @@ async fn bucket_info_results(
.table
.get(&bucket_id, &EmptyKey)
.await?
.map(|x| x.filtered_values(&garage.system.ring.borrow()))
.map(|x| x.filtered_values(&garage.system.cluster_layout()))
.unwrap_or_default();
let mpu_counters = garage
@ -130,7 +130,7 @@ async fn bucket_info_results(
.table
.get(&bucket_id, &EmptyKey)
.await?
.map(|x| x.filtered_values(&garage.system.ring.borrow()))
.map(|x| x.filtered_values(&garage.system.cluster_layout()))
.unwrap_or_default();
let mut relevant_keys = HashMap::new();

180
src/api/admin/cluster.rs
View file

@ -1,3 +1,4 @@
use std::collections::HashMap;
use std::net::SocketAddr;
use std::sync::Arc;
@ -15,25 +16,95 @@ use crate::admin::error::*;
use crate::helpers::{json_ok_response, parse_json_body};
pub async fn handle_get_cluster_status(garage: &Arc<Garage>) -> Result<Response<Body>, Error> {
let layout = garage.system.cluster_layout();
let mut nodes = garage
.system
.get_known_nodes()
.into_iter()
.map(|i| {
(
i.id,
NodeResp {
id: hex::encode(i.id),
addr: Some(i.addr),
hostname: i.status.hostname,
is_up: i.is_up,
last_seen_secs_ago: i.last_seen_secs_ago,
data_partition: i
.status
.data_disk_avail
.map(|(avail, total)| FreeSpaceResp {
available: avail,
total,
}),
metadata_partition: i.status.meta_disk_avail.map(|(avail, total)| {
FreeSpaceResp {
available: avail,
total,
}
}),
..Default::default()
},
)
})
.collect::<HashMap<_, _>>();
for (id, _, role) in layout.current().roles.items().iter() {
if let layout::NodeRoleV(Some(r)) = role {
let role = NodeRoleResp {
id: hex::encode(id),
zone: r.zone.to_string(),
capacity: r.capacity,
tags: r.tags.clone(),
};
match nodes.get_mut(id) {
None => {
nodes.insert(
*id,
NodeResp {
id: hex::encode(id),
role: Some(role),
..Default::default()
},
);
}
Some(n) => {
if n.role.is_none() {
n.role = Some(role);
}
}
}
}
}
for ver in layout.versions.iter().rev().skip(1) {
for (id, _, role) in ver.roles.items().iter() {
if let layout::NodeRoleV(Some(r)) = role {
if !nodes.contains_key(id) && r.capacity.is_some() {
nodes.insert(
*id,
NodeResp {
id: hex::encode(id),
draining: true,
..Default::default()
},
);
}
}
}
}
let mut nodes = nodes.into_values().collect::<Vec<_>>();
nodes.sort_by(|x, y| x.id.cmp(&y.id));
let res = GetClusterStatusResponse {
node: hex::encode(garage.system.id),
garage_version: garage_util::version::garage_version(),
garage_features: garage_util::version::garage_features(),
rust_version: garage_util::version::rust_version(),
db_engine: garage.db.engine(),
known_nodes: garage
.system
.get_known_nodes()
.into_iter()
.map(|i| KnownNodeResp {
id: hex::encode(i.id),
addr: i.addr,
is_up: i.is_up,
last_seen_secs_ago: i.last_seen_secs_ago,
hostname: i.status.hostname,
})
.collect(),
layout: format_cluster_layout(&garage.system.get_cluster_layout()),
layout_version: layout.current().version,
nodes,
};
Ok(json_ok_response(&res)?)
@ -84,13 +155,14 @@ pub async fn handle_connect_cluster_nodes(
}
pub async fn handle_get_cluster_layout(garage: &Arc<Garage>) -> Result<Response<Body>, Error> {
let res = format_cluster_layout(&garage.system.get_cluster_layout());
let res = format_cluster_layout(&garage.system.cluster_layout());
Ok(json_ok_response(&res)?)
}
fn format_cluster_layout(layout: &layout::ClusterLayout) -> GetClusterLayoutResponse {
fn format_cluster_layout(layout: &layout::LayoutHistory) -> GetClusterLayoutResponse {
let roles = layout
.current()
.roles
.items()
.iter()
@ -104,10 +176,12 @@ fn format_cluster_layout(layout: &layout::ClusterLayout) -> GetClusterLayoutResp
.collect::<Vec<_>>();
let staged_role_changes = layout
.staging_roles
.staging
.get()
.roles
.items()
.iter()
.filter(|(k, _, v)| layout.roles.get(k) != Some(v))
.filter(|(k, _, v)| layout.current().roles.get(k) != Some(v))
.map(|(k, _, v)| match &v.0 {
None => NodeRoleChange {
id: hex::encode(k),
@ -125,7 +199,7 @@ fn format_cluster_layout(layout: &layout::ClusterLayout) -> GetClusterLayoutResp
.collect::<Vec<_>>();
GetClusterLayoutResponse {
version: layout.version,
version: layout.current().version,
roles,
staged_role_changes,
}
@ -154,8 +228,8 @@ struct GetClusterStatusResponse {
garage_features: Option<&'static [&'static str]>,
rust_version: &'static str,
db_engine: String,
known_nodes: Vec<KnownNodeResp>,
layout: GetClusterLayoutResponse,
layout_version: u64,
nodes: Vec<NodeResp>,
}
#[derive(Serialize)]
@ -189,14 +263,27 @@ struct NodeRoleResp {
tags: Vec<String>,
}
#[derive(Serialize)]
#[derive(Serialize, Default)]
#[serde(rename_all = "camelCase")]
struct KnownNodeResp {
struct FreeSpaceResp {
available: u64,
total: u64,
}
#[derive(Serialize, Default)]
#[serde(rename_all = "camelCase")]
struct NodeResp {
id: String,
addr: SocketAddr,
role: Option<NodeRoleResp>,
addr: Option<SocketAddr>,
hostname: Option<String>,
is_up: bool,
last_seen_secs_ago: Option<u64>,
hostname: String,
draining: bool,
#[serde(skip_serializing_if = "Option::is_none")]
data_partition: Option<FreeSpaceResp>,
#[serde(skip_serializing_if = "Option::is_none")]
metadata_partition: Option<FreeSpaceResp>,
}
// ---- update functions ----
@ -207,10 +294,10 @@ pub async fn handle_update_cluster_layout(
) -> Result<Response<Body>, Error> {
let updates = parse_json_body::<UpdateClusterLayoutRequest>(req).await?;
let mut layout = garage.system.get_cluster_layout();
let mut layout = garage.system.cluster_layout().clone();
let mut roles = layout.roles.clone();
roles.merge(&layout.staging_roles);
let mut roles = layout.current().roles.clone();
roles.merge(&layout.staging.get().roles);
for change in updates {
let node = hex::decode(&change.id).ok_or_bad_request("Invalid node identifier")?;
@ -231,11 +318,17 @@ pub async fn handle_update_cluster_layout(
};
layout
.staging_roles
.staging
.get_mut()
.roles
.merge(&roles.update_mutator(node, layout::NodeRoleV(new_role)));
}
garage.system.update_cluster_layout(&layout).await?;
garage
.system
.layout_manager
.update_cluster_layout(&layout)
.await?;
let res = format_cluster_layout(&layout);
Ok(json_ok_response(&res)?)
@ -245,12 +338,16 @@ pub async fn handle_apply_cluster_layout(
garage: &Arc<Garage>,
req: Request<Body>,
) -> Result<Response<Body>, Error> {
let param = parse_json_body::<ApplyRevertLayoutRequest>(req).await?;
let param = parse_json_body::<ApplyLayoutRequest>(req).await?;
let layout = garage.system.get_cluster_layout();
let layout = garage.system.cluster_layout().clone();
let (layout, msg) = layout.apply_staged_changes(Some(param.version))?;
garage.system.update_cluster_layout(&layout).await?;
garage
.system
.layout_manager
.update_cluster_layout(&layout)
.await?;
let res = ApplyClusterLayoutResponse {
message: msg,
@ -259,15 +356,14 @@ pub async fn handle_apply_cluster_layout(
Ok(json_ok_response(&res)?)
}
pub async fn handle_revert_cluster_layout(
garage: &Arc<Garage>,
req: Request<Body>,
) -> Result<Response<Body>, Error> {
let param = parse_json_body::<ApplyRevertLayoutRequest>(req).await?;
let layout = garage.system.get_cluster_layout();
let layout = layout.revert_staged_changes(Some(param.version))?;
garage.system.update_cluster_layout(&layout).await?;
pub async fn handle_revert_cluster_layout(garage: &Arc<Garage>) -> Result<Response<Body>, Error> {
let layout = garage.system.cluster_layout().clone();
let layout = layout.revert_staged_changes()?;
garage
.system
.layout_manager
.update_cluster_layout(&layout)
.await?;
let res = format_cluster_layout(&layout);
Ok(json_ok_response(&res)?)
@ -279,7 +375,7 @@ type UpdateClusterLayoutRequest = Vec<NodeRoleChange>;
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct ApplyRevertLayoutRequest {
struct ApplyLayoutRequest {
version: u64,
}

8
src/api/common_error.rs
View file

@ -53,9 +53,7 @@ impl CommonError {
pub fn http_status_code(&self) -> StatusCode {
match self {
CommonError::InternalError(
GarageError::Timeout
| GarageError::RemoteError(_)
| GarageError::Quorum(_, _, _, _),
GarageError::Timeout | GarageError::RemoteError(_) | GarageError::Quorum(..),
) => StatusCode::SERVICE_UNAVAILABLE,
CommonError::InternalError(_) | CommonError::Hyper(_) | CommonError::Http(_) => {
StatusCode::INTERNAL_SERVER_ERROR
@ -72,9 +70,7 @@ impl CommonError {
match self {
CommonError::Forbidden(_) => "AccessDenied",
CommonError::InternalError(
GarageError::Timeout
| GarageError::RemoteError(_)
| GarageError::Quorum(_, _, _, _),
GarageError::Timeout | GarageError::RemoteError(_) | GarageError::Quorum(..),
) => "ServiceUnavailable",
CommonError::InternalError(_) | CommonError::Hyper(_) | CommonError::Http(_) => {
"InternalError"

11
src/api/k2v/index.rs
View file

@ -5,7 +5,6 @@ use serde::Serialize;
use garage_util::data::*;
use garage_rpc::ring::Ring;
use garage_table::util::*;
use garage_model::garage::Garage;
@ -26,7 +25,11 @@ pub async fn handle_read_index(
) -> Result<Response<Body>, Error> {
let reverse = reverse.unwrap_or(false);
let ring: Arc<Ring> = garage.system.ring.borrow().clone();
let node_id_vec = garage
.system
.cluster_layout()
.all_nongateway_nodes()
.to_vec();
let (partition_keys, more, next_start) = read_range(
&garage.k2v.counter_table.table,
@ -35,7 +38,7 @@ pub async fn handle_read_index(
&start,
&end,
limit,
Some((DeletedFilter::NotDeleted, ring.layout.node_id_vec.clone())),
Some((DeletedFilter::NotDeleted, node_id_vec)),
EnumerationOrder::from_reverse(reverse),
)
.await?;
@ -54,7 +57,7 @@ pub async fn handle_read_index(
partition_keys: partition_keys
.into_iter()
.map(|part| {
let vals = part.filtered_values(&ring);
let vals = part.filtered_values(&garage.system.cluster_layout());
ReadIndexResponseEntry {
pk: part.sk,
entries: *vals.get(&s_entries).unwrap_or(&0),

2
src/api/s3/put.rs
View file

@ -253,7 +253,7 @@ pub(crate) async fn check_quotas(
.await?;
let counters = counters
.map(|x| x.filtered_values(&garage.system.ring.borrow()))
.map(|x| x.filtered_values(&garage.system.cluster_layout()))
.unwrap_or_default();
let (prev_cnt_obj, prev_cnt_size) = match prev_object {

20
src/block/manager.rs
View file

@ -264,8 +264,10 @@ impl BlockManager {
F: Fn(DataBlockHeader, ByteStream) -> Fut,
Fut: futures::Future<Output = Result<T, Error>>,
{
let who = self.replication.read_nodes(hash);
let who = self.system.rpc.request_order(&who);
let who = self
.system
.rpc_helper()
.block_read_nodes_of(hash, self.system.rpc_helper());
for node in who.iter() {
let node_id = NodeID::from(*node);
@ -305,7 +307,7 @@ impl BlockManager {
// if the first one doesn't succeed rapidly
// TODO: keep first request running when initiating a new one and take the
// one that finishes earlier
_ = tokio::time::sleep(self.system.rpc.rpc_timeout()) => {
_ = tokio::time::sleep(self.system.rpc_helper().rpc_timeout()) => {
debug!("Get block {:?}: node {:?} didn't return block in time, trying next.", hash, node);
}
};
@ -354,7 +356,7 @@ impl BlockManager {
/// Send block to nodes that should have it
pub async fn rpc_put_block(&self, hash: Hash, data: Bytes) -> Result<(), Error> {
let who = self.replication.write_nodes(&hash);
let who = self.replication.write_sets(&hash);
let (header, bytes) = DataBlock::from_buffer(data, self.compression_level)
.await
@ -363,10 +365,10 @@ impl BlockManager {
Req::new(BlockRpc::PutBlock { hash, header })?.with_stream_from_buffer(bytes);
self.system
.rpc
.try_call_many(
.rpc_helper()
.try_write_many_sets(
&self.endpoint,
&who[..],
who.as_ref(),
put_block_rpc,
RequestStrategy::with_priority(PRIO_NORMAL | PRIO_SECONDARY)
.with_quorum(self.replication.write_quorum()),
@ -439,7 +441,7 @@ impl BlockManager {
tokio::spawn(async move {
if let Err(e) = this
.resync
.put_to_resync(&hash, 2 * this.system.rpc.rpc_timeout())
.put_to_resync(&hash, 2 * this.system.rpc_helper().rpc_timeout())
{
error!("Block {:?} could not be put in resync queue: {}.", hash, e);
}
@ -533,7 +535,7 @@ impl BlockManager {
None => {
// Not found but maybe we should have had it ??
self.resync
.put_to_resync(hash, 2 * self.system.rpc.rpc_timeout())?;
.put_to_resync(hash, 2 * self.system.rpc_helper().rpc_timeout())?;
return Err(Error::Message(format!(
"block {:?} not found on node",
hash

8
src/block/resync.rs
View file

@ -377,7 +377,7 @@ impl BlockResyncManager {
info!("Resync block {:?}: offloading and deleting", hash);
let existing_path = existing_path.unwrap();
let mut who = manager.replication.write_nodes(hash);
let mut who = manager.replication.storage_nodes(hash);
if who.len() < manager.replication.write_quorum() {
return Err(Error::Message("Not trying to offload block because we don't have a quorum of nodes to write to".to_string()));
}
@ -385,7 +385,7 @@ impl BlockResyncManager {
let who_needs_resps = manager
.system
.rpc
.rpc_helper()
.call_many(
&manager.endpoint,
&who,
@ -431,10 +431,10 @@ impl BlockResyncManager {
.with_stream_from_buffer(bytes);
manager
.system
.rpc
.rpc_helper()
.try_call_many(
&manager.endpoint,
&need_nodes[..],
&need_nodes,
put_block_message,
RequestStrategy::with_priority(PRIO_BACKGROUND)
.with_quorum(need_nodes.len()),

4
src/garage/admin/bucket.rs
View file

@ -70,7 +70,7 @@ impl AdminRpcHandler {
.table
.get(&bucket_id, &EmptyKey)
.await?
.map(|x| x.filtered_values(&self.garage.system.ring.borrow()))
.map(|x| x.filtered_values(&self.garage.system.cluster_layout()))
.unwrap_or_default();
let mpu_counters = self
@ -79,7 +79,7 @@ impl AdminRpcHandler {
.table
.get(&bucket_id, &EmptyKey)
.await?
.map(|x| x.filtered_values(&self.garage.system.ring.borrow()))
.map(|x| x.filtered_values(&self.garage.system.cluster_layout()))
.unwrap_or_default();
let mut relevant_keys = HashMap::new();

30
src/garage/admin/mod.rs
View file

@ -18,7 +18,7 @@ use garage_util::error::Error as GarageError;
use garage_table::replication::*;
use garage_table::*;
use garage_rpc::ring::PARTITION_BITS;
use garage_rpc::layout::PARTITION_BITS;
use garage_rpc::*;
use garage_block::manager::BlockResyncErrorInfo;
@ -126,8 +126,8 @@ impl AdminRpcHandler {
opt_to_send.all_nodes = false;
let mut failures = vec![];
let ring = self.garage.system.ring.borrow().clone();
for node in ring.layout.node_ids().iter() {
let all_nodes = self.garage.system.cluster_layout().all_nodes().to_vec();
for node in all_nodes.iter() {
let node = (*node).into();
let resp = self
.endpoint
@ -163,9 +163,9 @@ impl AdminRpcHandler {
async fn handle_stats(&self, opt: StatsOpt) -> Result<AdminRpc, Error> {
if opt.all_nodes {
let mut ret = String::new();
let ring = self.garage.system.ring.borrow().clone();
let all_nodes = self.garage.system.cluster_layout().all_nodes().to_vec();
for node in ring.layout.node_ids().iter() {
for node in all_nodes.iter() {
let mut opt = opt.clone();
opt.all_nodes = false;
opt.skip_global = true;
@ -274,11 +274,11 @@ impl AdminRpcHandler {
fn gather_cluster_stats(&self) -> String {
let mut ret = String::new();
// Gather storage node and free space statistics
let layout = &self.garage.system.ring.borrow().layout;
// Gather storage node and free space statistics for current nodes
let layout = &self.garage.system.cluster_layout();
let mut node_partition_count = HashMap::<Uuid, u64>::new();
for short_id in layout.ring_assignment_data.iter() {
let id = layout.node_id_vec[*short_id as usize];
for short_id in layout.current().ring_assignment_data.iter() {
let id = layout.current().node_id_vec[*short_id as usize];
*node_partition_count.entry(id).or_default() += 1;
}
let node_info = self
@ -293,8 +293,8 @@ impl AdminRpcHandler {
for (id, parts) in node_partition_count.iter() {
let info = node_info.get(id);
let status = info.map(|x| &x.status);
let role = layout.roles.get(id).and_then(|x| x.0.as_ref());
let hostname = status.map(|x| x.hostname.as_str()).unwrap_or("?");
let role = layout.current().roles.get(id).and_then(|x| x.0.as_ref());
let hostname = status.and_then(|x| x.hostname.as_deref()).unwrap_or("?");
let zone = role.map(|x| x.zone.as_str()).unwrap_or("?");
let capacity = role
.map(|x| x.capacity_string())
@ -440,8 +440,8 @@ impl AdminRpcHandler {
) -> Result<AdminRpc, Error> {
if all_nodes {
let mut ret = vec![];
let ring = self.garage.system.ring.borrow().clone();
for node in ring.layout.node_ids().iter() {
let all_nodes = self.garage.system.cluster_layout().all_nodes().to_vec();
for node in all_nodes.iter() {
let node = (*node).into();
match self
.endpoint
@ -488,8 +488,8 @@ impl AdminRpcHandler {
) -> Result<AdminRpc, Error> {
if all_nodes {
let mut ret = vec![];
let ring = self.garage.system.ring.borrow().clone();
for node in ring.layout.node_ids().iter() {
let all_nodes = self.garage.system.cluster_layout().all_nodes().to_vec();
for node in all_nodes.iter() {
let node = (*node).into();
match self
.endpoint

189
src/garage/cli/cmd.rs
View file

@ -1,4 +1,4 @@
use std::collections::HashSet;
use std::collections::{HashMap, HashSet};
use std::time::Duration;
use format_table::format_table;
@ -49,50 +49,61 @@ pub async fn cli_command_dispatch(
}
pub async fn cmd_status(rpc_cli: &Endpoint<SystemRpc, ()>, rpc_host: NodeID) -> Result<(), Error> {
let status = match rpc_cli
.call(&rpc_host, SystemRpc::GetKnownNodes, PRIO_NORMAL)
.await??
{
SystemRpc::ReturnKnownNodes(nodes) => nodes,
resp => return Err(Error::Message(format!("Invalid RPC response: {:?}", resp))),
};
let status = fetch_status(rpc_cli, rpc_host).await?;
let layout = fetch_layout(rpc_cli, rpc_host).await?;
println!("==== HEALTHY NODES ====");
let mut healthy_nodes =
vec!["ID\tHostname\tAddress\tTags\tZone\tCapacity\tDataAvail".to_string()];
for adv in status.iter().filter(|adv| adv.is_up) {
match layout.roles.get(&adv.id) {
Some(NodeRoleV(Some(cfg))) => {
let data_avail = match &adv.status.data_disk_avail {
_ if cfg.capacity.is_none() => "N/A".into(),
Some((avail, total)) => {
let pct = (*avail as f64) / (*total as f64) * 100.;
let avail = bytesize::ByteSize::b(*avail);
format!("{} ({:.1}%)", avail, pct)
}
None => "?".into(),
};
let host = adv.status.hostname.as_deref().unwrap_or("?");
if let Some(NodeRoleV(Some(cfg))) = layout.current().roles.get(&adv.id) {
let data_avail = match &adv.status.data_disk_avail {
_ if cfg.capacity.is_none() => "N/A".into(),
Some((avail, total)) => {
let pct = (*avail as f64) / (*total as f64) * 100.;
let avail = bytesize::ByteSize::b(*avail);
format!("{} ({:.1}%)", avail, pct)
}
None => "?".into(),
};
healthy_nodes.push(format!(
"{id:?}\t{host}\t{addr}\t[{tags}]\t{zone}\t{capacity}\t{data_avail}",
id = adv.id,
host = host,
addr = adv.addr,
tags = cfg.tags.join(","),
zone = cfg.zone,
capacity = cfg.capacity_string(),
data_avail = data_avail,
));
} else {
let prev_role = layout
.versions
.iter()
.rev()
.find_map(|x| match x.roles.get(&adv.id) {
Some(NodeRoleV(Some(cfg))) => Some(cfg),
_ => None,
});
if let Some(cfg) = prev_role {
healthy_nodes.push(format!(
"{id:?}\t{host}\t{addr}\t[{tags}]\t{zone}\t{capacity}\t{data_avail}",
"{id:?}\t{host}\t{addr}\t[{tags}]\t{zone}\tdraining metadata...",
id = adv.id,
host = adv.status.hostname,
host = host,
addr = adv.addr,
tags = cfg.tags.join(","),
zone = cfg.zone,
capacity = cfg.capacity_string(),
data_avail = data_avail,
));
}
_ => {
let new_role = match layout.staging_roles.get(&adv.id) {
Some(NodeRoleV(Some(_))) => "(pending)",
} else {
let new_role = match layout.staging.get().roles.get(&adv.id) {
Some(NodeRoleV(Some(_))) => "pending...",
_ => "NO ROLE ASSIGNED",
};
healthy_nodes.push(format!(
"{id:?}\t{h}\t{addr}\t{new_role}",
"{id:?}\t{h}\t{addr}\t\t\t{new_role}",
id = adv.id,
h = adv.status.hostname,
h = host,
addr = adv.addr,
new_role = new_role,
));
@ -101,51 +112,76 @@ pub async fn cmd_status(rpc_cli: &Endpoint<SystemRpc, ()>, rpc_host: NodeID) ->
}
format_table(healthy_nodes);
let status_keys = status.iter().map(|adv| adv.id).collect::<HashSet<_>>();
let failure_case_1 = status
// Determine which nodes are unhealthy and print that to stdout
let status_map = status
.iter()
.any(|adv| !adv.is_up && matches!(layout.roles.get(&adv.id), Some(NodeRoleV(Some(_)))));
let failure_case_2 = layout
.roles
.items()
.iter()
.any(|(id, _, v)| !status_keys.contains(id) && v.0.is_some());
if failure_case_1 || failure_case_2 {
println!("\n==== FAILED NODES ====");
let mut failed_nodes =
vec!["ID\tHostname\tAddress\tTags\tZone\tCapacity\tLast seen".to_string()];
for adv in status.iter().filter(|adv| !adv.is_up) {
if let Some(NodeRoleV(Some(cfg))) = layout.roles.get(&adv.id) {
let tf = timeago::Formatter::new();
failed_nodes.push(format!(
"{id:?}\t{host}\t{addr}\t[{tags}]\t{zone}\t{capacity}\t{last_seen}",
id = adv.id,
host = adv.status.hostname,
addr = adv.addr,
tags = cfg.tags.join(","),
zone = cfg.zone,
capacity = cfg.capacity_string(),
last_seen = adv
.last_seen_secs_ago
.map(|adv| (adv.id, adv))
.collect::<HashMap<_, _>>();
let tf = timeago::Formatter::new();
let mut drain_msg = false;
let mut failed_nodes =
vec!["ID\tHostname\tAddress\tTags\tZone\tCapacity\tLast seen".to_string()];
let mut listed = HashSet::new();
for ver in layout.versions.iter().rev() {
for (node, _, role) in ver.roles.items().iter() {
let cfg = match role {
NodeRoleV(Some(role)) if role.capacity.is_some() => role,
_ => continue,
};
if listed.contains(node) {
continue;
}
listed.insert(*node);
let adv = status_map.get(node);
if adv.map(|x| x.is_up).unwrap_or(false) {
continue;
}
// Node is in a layout version, is not a gateway node, and is not up:
// it is in a failed state, add proper line to the output
let (host, addr, last_seen) = match adv {
Some(adv) => (
adv.status.hostname.as_deref().unwrap_or("?"),
adv.addr.to_string(),
adv.last_seen_secs_ago
.map(|s| tf.convert(Duration::from_secs(s)))
.unwrap_or_else(|| "never seen".into()),
));
}
}
for (id, _, role_v) in layout.roles.items().iter() {
if let NodeRoleV(Some(cfg)) = role_v {
if !status_keys.contains(id) {
failed_nodes.push(format!(
"{id:?}\t??\t??\t[{tags}]\t{zone}\t{capacity}\tnever seen",
id = id,
tags = cfg.tags.join(","),
zone = cfg.zone,
capacity = cfg.capacity_string(),
));
}
}
),
None => ("??", "??".into(), "never seen".into()),
};
let capacity = if ver.version == layout.current().version {
cfg.capacity_string()
} else {
drain_msg = true;
"draining metadata...".to_string()
};
failed_nodes.push(format!(
"{id:?}\t{host}\t{addr}\t[{tags}]\t{zone}\t{capacity}\t{last_seen}",
id = node,
host = host,
addr = addr,
tags = cfg.tags.join(","),
zone = cfg.zone,
capacity = capacity,
last_seen = last_seen,
));
}
}
if failed_nodes.len() > 1 {
println!("\n==== FAILED NODES ====");
format_table(failed_nodes);
if drain_msg {
println!();
println!("Your cluster is expecting to drain data from nodes that are currently unavailable.");
println!("If these nodes are definitely dead, please review the layout history with");
println!(
"`garage layout history` and use `garage layout skip-dead-nodes` to force progress."
);
}
}
if print_staging_role_changes(&layout) {
@ -226,3 +262,18 @@ pub async fn cmd_admin(
}
Ok(())
}
// ---- utility ----
pub async fn fetch_status(
rpc_cli: &Endpoint<SystemRpc, ()>,
rpc_host: NodeID,
) -> Result<Vec<KnownNodeInfo>, Error> {
match rpc_cli
.call(&rpc_host, SystemRpc::GetKnownNodes, PRIO_NORMAL)
.await??
{
SystemRpc::ReturnKnownNodes(nodes) => Ok(nodes),
resp => Err(Error::unexpected_rpc_message(resp)),
}
}

230
src/garage/cli/layout.rs
View file

@ -32,6 +32,10 @@ pub async fn cli_layout_command_dispatch(
LayoutOperation::Config(config_opt) => {
cmd_config_layout(system_rpc_endpoint, rpc_host, config_opt).await
}
LayoutOperation::History => cmd_layout_history(system_rpc_endpoint, rpc_host).await,
LayoutOperation::SkipDeadNodes(assume_sync_opt) => {
cmd_layout_skip_dead_nodes(system_rpc_endpoint, rpc_host, assume_sync_opt).await
}
}
}
@ -49,6 +53,7 @@ pub async fn cmd_assign_role(
};
let mut layout = fetch_layout(rpc_cli, rpc_host).await?;
let all_nodes = layout.get_all_nodes();
let added_nodes = args
.node_ids
@ -58,21 +63,23 @@ pub async fn cmd_assign_role(
status
.iter()
.map(|adv| adv.id)
.chain(layout.node_ids().iter().cloned()),
.chain(all_nodes.iter().cloned()),
node_id,
)
})
.collect::<Result<Vec<_>, _>>()?;
let mut roles = layout.roles.clone();
roles.merge(&layout.staging_roles);
let mut roles = layout.current().roles.clone();
roles.merge(&layout.staging.get().roles);
for replaced in args.replace.iter() {
let replaced_node = find_matching_node(layout.node_ids().iter().cloned(), replaced)?;
let replaced_node = find_matching_node(all_nodes.iter().cloned(), replaced)?;
match roles.get(&replaced_node) {
Some(NodeRoleV(Some(_))) => {
layout
.staging_roles
.staging
.get_mut()
.roles
.merge(&roles.update_mutator(replaced_node, NodeRoleV(None)));
}
_ => {
@ -130,7 +137,9 @@ pub async fn cmd_assign_role(
};
layout
.staging_roles
.staging
.get_mut()
.roles
.merge(&roles.update_mutator(added_node, NodeRoleV(Some(new_entry))));
}
@ -149,14 +158,16 @@ pub async fn cmd_remove_role(
) -> Result<(), Error> {
let mut layout = fetch_layout(rpc_cli, rpc_host).await?;
let mut roles = layout.roles.clone();
roles.merge(&layout.staging_roles);
let mut roles = layout.current().roles.clone();
roles.merge(&layout.staging.get().roles);
let deleted_node =
find_matching_node(roles.items().iter().map(|(id, _, _)| *id), &args.node_id)?;
layout
.staging_roles
.staging
.get_mut()
.roles
.merge(&roles.update_mutator(deleted_node, NodeRoleV(None)));
send_layout(rpc_cli, rpc_host, layout).await?;
@ -174,13 +185,16 @@ pub async fn cmd_show_layout(
let layout = fetch_layout(rpc_cli, rpc_host).await?;
println!("==== CURRENT CLUSTER LAYOUT ====");
print_cluster_layout(&layout, "No nodes currently have a role in the cluster.\nSee `garage status` to view available nodes.");
print_cluster_layout(layout.current(), "No nodes currently have a role in the cluster.\nSee `garage status` to view available nodes.");
println!();
println!("Current cluster layout version: {}", layout.version);
println!(
"Current cluster layout version: {}",
layout.current().version
);
let has_role_changes = print_staging_role_changes(&layout);
if has_role_changes {
let v = layout.version;
let v = layout.current().version;
let res_apply = layout.apply_staged_changes(Some(v + 1));
// this will print the stats of what partitions
@ -189,7 +203,7 @@ pub async fn cmd_show_layout(
Ok((layout, msg)) => {
println!();
println!("==== NEW CLUSTER LAYOUT AFTER APPLYING CHANGES ====");
print_cluster_layout(&layout, "No nodes have a role in the new layout.");
print_cluster_layout(layout.current(), "No nodes have a role in the new layout.");
println!();
for line in msg.iter() {
@ -199,16 +213,12 @@ pub async fn cmd_show_layout(
println!();
println!(" garage layout apply --version {}", v + 1);
println!();
println!(
"You can also revert all proposed changes with: garage layout revert --version {}",
v + 1)
println!("You can also revert all proposed changes with: garage layout revert");
}
Err(e) => {
println!("Error while trying to compute the assignment: {}", e);
println!("This new layout cannot yet be applied.");
println!(
"You can also revert all proposed changes with: garage layout revert --version {}",
v + 1)
println!("You can also revert all proposed changes with: garage layout revert");
}
}
}
@ -241,9 +251,15 @@ pub async fn cmd_revert_layout(
rpc_host: NodeID,
revert_opt: RevertLayoutOpt,
) -> Result<(), Error> {
if !revert_opt.yes {
return Err(Error::Message(
"Please add the --yes flag to run the layout revert operation".into(),
));
}
let layout = fetch_layout(rpc_cli, rpc_host).await?;
let layout = layout.revert_staged_changes(revert_opt.version)?;
let layout = layout.revert_staged_changes()?;
send_layout(rpc_cli, rpc_host, layout).await?;
@ -266,11 +282,11 @@ pub async fn cmd_config_layout(
.parse::<ZoneRedundancy>()
.ok_or_message("invalid zone redundancy value")?;
if let ZoneRedundancy::AtLeast(r_int) = r {
if r_int > layout.replication_factor {
if r_int > layout.current().replication_factor {
return Err(Error::Message(format!(
"The zone redundancy must be smaller or equal to the \
replication factor ({}).",
layout.replication_factor
layout.current().replication_factor
)));
} else if r_int < 1 {
return Err(Error::Message(
@ -280,7 +296,9 @@ pub async fn cmd_config_layout(
}
layout
.staging_parameters
.staging
.get_mut()
.parameters
.update(LayoutParameters { zone_redundancy: r });
println!("The zone redundancy parameter has been set to '{}'.", r);
did_something = true;
@ -297,25 +315,166 @@ pub async fn cmd_config_layout(
Ok(())
}
pub async fn cmd_layout_history(
rpc_cli: &Endpoint<SystemRpc, ()>,
rpc_host: NodeID,
) -> Result<(), Error> {
let layout = fetch_layout(rpc_cli, rpc_host).await?;
let min_stored = layout.min_stored();
println!("==== LAYOUT HISTORY ====");
let mut table = vec!["Version\tStatus\tStorage nodes\tGateway nodes".to_string()];
for ver in layout
.versions
.iter()
.rev()
.chain(layout.old_versions.iter().rev())
{
let status = if ver.version == layout.current().version {
"current"
} else if ver.version >= min_stored {
"draining"
} else {
"historical"
};
table.push(format!(
"#{}\t{}\t{}\t{}",
ver.version,
status,
ver.roles
.items()
.iter()
.filter(|(_, _, x)| matches!(x, NodeRoleV(Some(c)) if c.capacity.is_some()))
.count(),
ver.roles
.items()
.iter()
.filter(|(_, _, x)| matches!(x, NodeRoleV(Some(c)) if c.capacity.is_none()))
.count(),
));
}
format_table(table);
println!();
if layout.versions.len() > 1 {
println!("==== UPDATE TRACKERS ====");
println!("Several layout versions are currently live in the version, and data is being migrated.");
println!(
"This is the internal data that Garage stores to know which nodes have what data."
);
println!();
let mut table = vec!["Node\tAck\tSync\tSync_ack".to_string()];
let all_nodes = layout.get_all_nodes();
for node in all_nodes.iter() {
table.push(format!(
"{:?}\t#{}\t#{}\t#{}",
node,
layout.update_trackers.ack_map.get(node, min_stored),
layout.update_trackers.sync_map.get(node, min_stored),
layout.update_trackers.sync_ack_map.get(node, min_stored),
));
}
table[1..].sort();
format_table(table);
println!();
println!(
"If some nodes are not catching up to the latest layout version in the update trackers,"
);
println!("it might be because they are offline or unable to complete a sync successfully.");
println!(
"You may force progress using `garage layout skip-dead-nodes --version {}`",
layout.current().version
);
} else {
println!("Your cluster is currently in a stable state with a single live layout version.");
println!("No metadata migration is in progress. Note that the migration of data blocks is not tracked,");
println!(
"so you might want to keep old nodes online until their data directories become empty."
);
}
Ok(())
}
pub async fn cmd_layout_skip_dead_nodes(
rpc_cli: &Endpoint<SystemRpc, ()>,
rpc_host: NodeID,
opt: SkipDeadNodesOpt,
) -> Result<(), Error> {
let status = fetch_status(rpc_cli, rpc_host).await?;
let mut layout = fetch_layout(rpc_cli, rpc_host).await?;
if layout.versions.len() == 1 {
return Err(Error::Message(
"This command cannot be called when there is only one live cluster layout version"
.into(),
));
}
let min_v = layout.min_stored();
if opt.version <= min_v || opt.version > layout.current().version {
return Err(Error::Message(format!(
"Invalid version, you may use the following version numbers: {}",
(min_v + 1..=layout.current().version)
.map(|x| x.to_string())
.collect::<Vec<_>>()
.join(" ")
)));
}
let all_nodes = layout.get_all_nodes();
let mut did_something = false;
for node in all_nodes.iter() {
if status.iter().any(|x| x.id == *node && x.is_up) {
continue;
}
if layout.update_trackers.ack_map.set_max(*node, opt.version) {
println!("Increased the ACK tracker for node {:?}", node);
did_something = true;
}
if opt.allow_missing_data {
if layout.update_trackers.sync_map.set_max(*node, opt.version) {
println!("Increased the SYNC tracker for node {:?}", node);
did_something = true;
}
}
}
if did_something {
send_layout(rpc_cli, rpc_host, layout).await?;
println!("Success.");
Ok(())
} else if !opt.allow_missing_data {
Err(Error::Message("Nothing was done, try passing the `--allow-missing-data` flag to force progress even when not enough nodes can complete a metadata sync.".into()))
} else {
Err(Error::Message(
"Sorry, there is nothing I can do for you. Please wait patiently. If you ask for help, please send the output of the `garage layout history` command.".into(),
))
}
}
// --- utility ---
pub async fn fetch_layout(
rpc_cli: &Endpoint<SystemRpc, ()>,
rpc_host: NodeID,
) -> Result<ClusterLayout, Error> {
) -> Result<LayoutHistory, Error> {
match rpc_cli
.call(&rpc_host, SystemRpc::PullClusterLayout, PRIO_NORMAL)
.await??
{
SystemRpc::AdvertiseClusterLayout(t) => Ok(t),
resp => Err(Error::Message(format!("Invalid RPC response: {:?}", resp))),
resp => Err(Error::unexpected_rpc_message(resp)),
}
}
pub async fn send_layout(
rpc_cli: &Endpoint<SystemRpc, ()>,
rpc_host: NodeID,
layout: ClusterLayout,
layout: LayoutHistory,
) -> Result<(), Error> {
rpc_cli
.call(
@ -327,7 +486,7 @@ pub async fn send_layout(
Ok(())
}
pub fn print_cluster_layout(layout: &ClusterLayout, empty_msg: &str) {
pub fn print_cluster_layout(layout: &LayoutVersion, empty_msg: &str) {
let mut table = vec!["ID\tTags\tZone\tCapacity\tUsable capacity".to_string()];
for (id, _, role) in layout.roles.items().iter() {
let role = match &role.0 {
@ -366,21 +525,22 @@ pub fn print_cluster_layout(layout: &ClusterLayout, empty_msg: &str) {
}
}
pub fn print_staging_role_changes(layout: &ClusterLayout) -> bool {
let has_role_changes = layout
.staging_roles
pub fn print_staging_role_changes(layout: &LayoutHistory) -> bool {
let staging = layout.staging.get();
let has_role_changes = staging
.roles
.items()
.iter()
.any(|(k, _, v)| layout.roles.get(k) != Some(v));
let has_layout_changes = *layout.staging_parameters.get() != layout.parameters;
.any(|(k, _, v)| layout.current().roles.get(k) != Some(v));
let has_layout_changes = *staging.parameters.get() != layout.current().parameters;
if has_role_changes || has_layout_changes {
println!();
println!("==== STAGED ROLE CHANGES ====");
if has_role_changes {
let mut table = vec!["ID\tTags\tZone\tCapacity".to_string()];
for (id, _, role) in layout.staging_roles.items().iter() {
if layout.roles.get(id) == Some(role) {
for (id, _, role) in staging.roles.items().iter() {
if layout.current().roles.get(id) == Some(role) {
continue;
}
if let Some(role) = &role.0 {
@ -402,7 +562,7 @@ pub fn print_staging_role_changes(layout: &ClusterLayout) -> bool {
if has_layout_changes {
println!(
"Zone redundancy: {}",
layout.staging_parameters.get().zone_redundancy
staging.parameters.get().zone_redundancy
);
}
true

24
src/garage/cli/structs.rs
View file

@ -112,6 +112,14 @@ pub enum LayoutOperation {
/// Revert staged changes to cluster layout
#[structopt(name = "revert", version = garage_version())]
Revert(RevertLayoutOpt),
/// View the history of layouts in the cluster
#[structopt(name = "history", version = garage_version())]
History,
/// Skip dead nodes when awaiting for a new layout version to be synchronized
#[structopt(name = "skip-dead-nodes", version = garage_version())]
SkipDeadNodes(SkipDeadNodesOpt),
}
#[derive(StructOpt, Debug)]
@ -164,9 +172,21 @@ pub struct ApplyLayoutOpt {
#[derive(StructOpt, Debug)]
pub struct RevertLayoutOpt {
/// Version number of old configuration to which to revert
/// The revert operation will not be ran unless this flag is added
#[structopt(long = "yes")]
pub(crate) yes: bool,
}
#[derive(StructOpt, Debug)]
pub struct SkipDeadNodesOpt {
/// Version number of the layout to assume is currently up-to-date.
/// This will generally be the current layout version.
#[structopt(long = "version")]
pub(crate) version: Option<u64>,
pub(crate) version: u64,
/// Allow the skip even if a quorum of ndoes could not be found for
/// the data among the remaining nodes
#[structopt(long = "allow-missing-data")]
pub(crate) allow_missing_data: bool,
}
#[derive(Serialize, Deserialize, StructOpt, Debug)]

4
src/garage/cli/util.rs
View file

@ -450,6 +450,8 @@ pub fn print_block_info(
if refcount != nondeleted_count {
println!();
println!("Warning: refcount does not match number of non-deleted versions");
println!(
"Warning: refcount does not match number of non-deleted versions (see issue #644)."
);
}
}

44
src/garage/tests/common/ext/process.rs
View file

@ -14,42 +14,20 @@ impl CommandExt for process::Command {
}
fn expect_success_status(&mut self, msg: &str) -> process::ExitStatus {
let status = self.status().expect(msg);
status.expect_success(msg);
status
self.expect_success_output(msg).status
}
fn expect_success_output(&mut self, msg: &str) -> process::Output {
let output = self.output().expect(msg);
output.expect_success(msg);
if !output.status.success() {
panic!(
"{}: command {:?} exited with error {:?}\nSTDOUT: {}\nSTDERR: {}",
msg,
self,
output.status.code(),
String::from_utf8_lossy(&output.stdout),
String::from_utf8_lossy(&output.stderr)
);
}
output
}
}
pub trait OutputExt {
fn expect_success(&self, msg: &str);
}
impl OutputExt for process::Output {
fn expect_success(&self, msg: &str) {
self.status.expect_success(msg)
}
}
pub trait ExitStatusExt {
fn expect_success(&self, msg: &str);
}
impl ExitStatusExt for process::ExitStatus {
fn expect_success(&self, msg: &str) {
if !self.success() {
match self.code() {
Some(code) => panic!(
"Command exited with code {code}: {msg}",
code = code,
msg = msg
),
None => panic!("Command exited with signal: {msg}", msg = msg),
}
}
}
}

2
src/garage/tests/common/garage.rs
View file

@ -96,7 +96,7 @@ api_bind_addr = "127.0.0.1:{admin_port}"
.arg("server")
.stdout(stdout)
.stderr(stderr)
.env("RUST_LOG", "garage=info,garage_api=trace")
.env("RUST_LOG", "garage=debug,garage_api=trace")
.spawn()
.expect("Could not start garage");

12
src/model/helper/bucket.rs
View file

@ -450,10 +450,12 @@ impl<'a> BucketHelper<'a> {
#[cfg(feature = "k2v")]
{
use garage_rpc::ring::Ring;
use std::sync::Arc;
let ring: Arc<Ring> = self.0.system.ring.borrow().clone();
let node_id_vec = self
.0
.system
.cluster_layout()
.all_nongateway_nodes()
.to_vec();
let k2vindexes = self
.0
.k2v
@ -462,7 +464,7 @@ impl<'a> BucketHelper<'a> {
.get_range(
&bucket_id,
None,
Some((DeletedFilter::NotDeleted, ring.layout.node_id_vec.clone())),
Some((DeletedFilter::NotDeleted, node_id_vec)),
10,
EnumerationOrder::Forward,
)

8
src/model/index_counter.rs
View file

@ -7,7 +7,7 @@ use serde::{Deserialize, Serialize};
use garage_db as db;
use garage_rpc::ring::Ring;
use garage_rpc::layout::LayoutHelper;
use garage_rpc::system::System;
use garage_util::background::BackgroundRunner;
use garage_util::data::*;
@ -83,9 +83,9 @@ impl<T: CountedItem> Entry<T::CP, T::CS> for CounterEntry<T> {
}
impl<T: CountedItem> CounterEntry<T> {
pub fn filtered_values(&self, ring: &Ring) -> HashMap<String, i64> {
let nodes = &ring.layout.node_id_vec[..];
self.filtered_values_with_nodes(nodes)
pub fn filtered_values(&self, layout: &LayoutHelper) -> HashMap<String, i64> {
let nodes = layout.all_nongateway_nodes();
self.filtered_values_with_nodes(&nodes)
}
pub fn filtered_values_with_nodes(&self, nodes: &[Uuid]) -> HashMap<String, i64> {

45
src/model/k2v/rpc.rs
View file

@ -127,23 +127,21 @@ impl K2VRpcHandler {
.item_table
.data
.replication
.write_nodes(&partition.hash());
.storage_nodes(&partition.hash());
who.sort();
self.system
.rpc
.rpc_helper()
.try_call_many(
&self.endpoint,
&who[..],
&who,
K2VRpc::InsertItem(InsertedItem {
partition,
sort_key,
causal_context,
value,
}),
RequestStrategy::with_priority(PRIO_NORMAL)
.with_quorum(1)
.interrupt_after_quorum(true),
RequestStrategy::with_priority(PRIO_NORMAL).with_quorum(1),
)
.await?;
@ -168,7 +166,7 @@ impl K2VRpcHandler {
.item_table
.data
.replication
.write_nodes(&partition.hash());
.storage_nodes(&partition.hash());
who.sort();
call_list.entry(who).or_default().push(InsertedItem {
@ -187,14 +185,12 @@ impl K2VRpcHandler {
let call_futures = call_list.into_iter().map(|(nodes, items)| async move {
let resp = self
.system
.rpc
.rpc_helper()
.try_call_many(
&self.endpoint,
&nodes[..],
K2VRpc::InsertManyItems(items),
RequestStrategy::with_priority(PRIO_NORMAL)
.with_quorum(1)
.interrupt_after_quorum(true),
RequestStrategy::with_priority(PRIO_NORMAL).with_quorum(1),
)
.await?;
Ok::<_, Error>((nodes, resp))
@ -223,15 +219,16 @@ impl K2VRpcHandler {
},
sort_key,
};
// TODO figure this out with write sets, is it still appropriate???
let nodes = self
.item_table
.data
.replication
.write_nodes(&poll_key.partition.hash());
.read_nodes(&poll_key.partition.hash());
let rpc = self.system.rpc.try_call_many(
let rpc = self.system.rpc_helper().try_call_many(
&self.endpoint,
&nodes[..],
&nodes,
K2VRpc::PollItem {
key: poll_key,
causal_context,
@ -239,9 +236,11 @@ impl K2VRpcHandler {
},
RequestStrategy::with_priority(PRIO_NORMAL)
.with_quorum(self.item_table.data.replication.read_quorum())
.send_all_at_once(true)
.without_timeout(),
);
let timeout_duration = Duration::from_millis(timeout_msec) + self.system.rpc.rpc_timeout();
let timeout_duration =
Duration::from_millis(timeout_msec) + self.system.rpc_helper().rpc_timeout();
let resps = select! {
r = rpc => r?,
_ = tokio::time::sleep(timeout_duration) => return Ok(None),
@ -283,11 +282,12 @@ impl K2VRpcHandler {
seen.restrict(&range);
// Prepare PollRange RPC to send to the storage nodes responsible for the parititon
// TODO figure this out with write sets, does it still work????
let nodes = self
.item_table
.data
.replication
.write_nodes(&range.partition.hash());
.read_nodes(&range.partition.hash());
let quorum = self.item_table.data.replication.read_quorum();
let msg = K2VRpc::PollRange {
range,
@ -300,7 +300,11 @@ impl K2VRpcHandler {
let rs = RequestStrategy::with_priority(PRIO_NORMAL).without_timeout();
let mut requests = nodes
.iter()
.map(|node| self.system.rpc.call(&self.endpoint, *node, msg.clone(), rs))
.map(|node| {
self.system
.rpc_helper()
.call(&self.endpoint, *node, msg.clone(), rs)
})
.collect::<FuturesUnordered<_>>();
// Fetch responses. This procedure stops fetching responses when any of the following
@ -316,8 +320,9 @@ impl K2VRpcHandler {
// kind: all items produced by that node until time ts have been returned, so we can
// bump the entry in the global vector clock and possibly remove some item-specific
// vector clocks)
let mut deadline =
Instant::now() + Duration::from_millis(timeout_msec) + self.system.rpc.rpc_timeout();
let mut deadline = Instant::now()
+ Duration::from_millis(timeout_msec)
+ self.system.rpc_helper().rpc_timeout();
let mut resps = vec![];
let mut errors = vec![];
loop {
@ -339,7 +344,7 @@ impl K2VRpcHandler {
}
if errors.len() > nodes.len() - quorum {
let errors = errors.iter().map(|e| format!("{}", e)).collect::<Vec<_>>();
return Err(Error::Quorum(quorum, resps.len(), nodes.len(), errors).into());
return Err(Error::Quorum(quorum, None, resps.len(), nodes.len(), errors).into());
}
// Take all returned items into account to produce the response.

10
src/rpc/graph_algo.rs → src/rpc/layout/graph_algo.rs
View file

@ -114,16 +114,6 @@ impl Graph<FlowEdge> {
Ok(result)
}
/// This function returns the value of the flow incoming to v.
pub fn get_inflow(&self, v: Vertex) -> Result<i64, String> {
let idv = self.get_vertex_id(&v)?;
let mut result = 0;
for edge in self.graph[idv].iter() {
result += max(0, self.graph[edge.dest][edge.rev].flow);
}
Ok(result)
}
/// This function returns the value of the flow outgoing from v.
pub fn get_outflow(&self, v: Vertex) -> Result<i64, String> {
let idv = self.get_vertex_id(&v)?;

294
src/rpc/layout/helper.rs Normal file
View file

@ -0,0 +1,294 @@
use std::collections::HashMap;
use std::ops::Deref;
use std::sync::atomic::{AtomicUsize, Ordering};
use serde::{Deserialize, Serialize};
use garage_util::data::*;
use super::*;
use crate::replication_mode::ReplicationMode;
#[derive(Debug, Clone, Serialize, Deserialize, Default, PartialEq, Eq)]
pub struct RpcLayoutDigest {
/// Cluster layout version
pub current_version: u64,
/// Number of active layout versions
pub active_versions: usize,
/// Hash of cluster layout update trackers
pub trackers_hash: Hash,
/// Hash of cluster layout staging data
pub staging_hash: Hash,
}
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
pub struct SyncLayoutDigest {
current: u64,
ack_map_min: u64,
min_stored: u64,
}
pub struct LayoutHelper {
replication_mode: ReplicationMode,
layout: Option<LayoutHistory>,
// cached values
ack_map_min: u64,
sync_map_min: u64,
all_nodes: Vec<Uuid>,
all_nongateway_nodes: Vec<Uuid>,
trackers_hash: Hash,
staging_hash: Hash,
// ack lock: counts in-progress write operations for each
// layout version ; we don't increase the ack update tracker
// while this lock is nonzero
pub(crate) ack_lock: HashMap<u64, AtomicUsize>,
}
impl Deref for LayoutHelper {
type Target = LayoutHistory;
fn deref(&self) -> &LayoutHistory {
self.layout()
}
}
impl LayoutHelper {
pub fn new(
replication_mode: ReplicationMode,
mut layout: LayoutHistory,
mut ack_lock: HashMap<u64, AtomicUsize>,
) -> Self {
// In the new() function of the helper, we do a bunch of cleanup
// and calculations on the layout history to make sure things are
// correct and we have rapid access to important values such as
// the layout versions to use when reading to ensure consistency.
if !replication_mode.is_read_after_write_consistent() {
// Fast path for when no consistency is required.
// In this case we only need to keep the last version of the layout,
// we don't care about coordinating stuff in the cluster.
layout.keep_current_version_only();
}
layout.cleanup_old_versions();
let all_nodes = layout.get_all_nodes();
let all_nongateway_nodes = layout.get_all_nongateway_nodes();
layout.clamp_update_trackers(&all_nodes);
let min_version = layout.min_stored();
// ack_map_min is the minimum value of ack_map among all nodes
// in the cluster (gateway, non-gateway, current and previous layouts).
// It is the highest layout version which all of these nodes have
// acknowledged, indicating that they are aware of it and are no
// longer processing write operations that did not take it into account.
let ack_map_min = layout
.update_trackers
.ack_map
.min_among(&all_nodes, min_version);
// sync_map_min is the minimum value of sync_map among storage nodes
// in the cluster (non-gateway nodes only, current and previous layouts).
// It is the highest layout version for which we know that all relevant
// storage nodes have fullfilled a sync, and therefore it is safe to
// use a read quorum within that layout to ensure consistency.
// Gateway nodes are excluded here because they hold no relevant data
// (they store the bucket and access key tables, but we don't have
// consistency on those).
// This value is calculated using quorums to allow progress even
// if not all nodes have successfully completed a sync.
let sync_map_min =
layout.calculate_sync_map_min_with_quorum(replication_mode, &all_nongateway_nodes);
let trackers_hash = layout.calculate_trackers_hash();
let staging_hash = layout.calculate_staging_hash();
ack_lock.retain(|_, cnt| *cnt.get_mut() > 0);
ack_lock
.entry(layout.current().version)
.or_insert(AtomicUsize::new(0));
LayoutHelper {
replication_mode,
layout: Some(layout),
ack_map_min,
sync_map_min,
all_nodes,
all_nongateway_nodes,
trackers_hash,
staging_hash,
ack_lock,
}
}
// ------------------ single updating function --------------
fn layout(&self) -> &LayoutHistory {
self.layout.as_ref().unwrap()
}
pub(crate) fn update<F>(&mut self, f: F) -> bool
where
F: FnOnce(&mut LayoutHistory) -> bool,
{
let changed = f(self.layout.as_mut().unwrap());
if changed {
*self = Self::new(
self.replication_mode,
self.layout.take().unwrap(),
std::mem::take(&mut self.ack_lock),
);
}
changed
}
// ------------------ read helpers ---------------
pub fn all_nodes(&self) -> &[Uuid] {
&self.all_nodes
}
pub fn all_nongateway_nodes(&self) -> &[Uuid] {
&self.all_nongateway_nodes
}
pub fn ack_map_min(&self) -> u64 {
self.ack_map_min
}
pub fn sync_map_min(&self) -> u64 {
self.sync_map_min
}
pub fn sync_digest(&self) -> SyncLayoutDigest {
SyncLayoutDigest {
current: self.layout().current().version,
ack_map_min: self.ack_map_min(),
min_stored: self.layout().min_stored(),
}
}
pub fn read_nodes_of(&self, position: &Hash) -> Vec<Uuid> {
let sync_min = self.sync_map_min;
let version = self
.layout()
.versions
.iter()
.find(|x| x.version == sync_min)
.or(self.layout().versions.last())
.unwrap();
version
.nodes_of(position, version.replication_factor)
.collect()
}
pub fn storage_sets_of(&self, position: &Hash) -> Vec<Vec<Uuid>> {
self.layout()
.versions
.iter()
.map(|x| x.nodes_of(position, x.replication_factor).collect())
.collect()
}
pub fn storage_nodes_of(&self, position: &Hash) -> Vec<Uuid> {
let mut ret = vec![];
for version in self.layout().versions.iter() {
ret.extend(version.nodes_of(position, version.replication_factor));
}
ret.sort();
ret.dedup();
ret
}
pub fn trackers_hash(&self) -> Hash {
self.trackers_hash
}
pub fn staging_hash(&self) -> Hash {
self.staging_hash
}
pub fn digest(&self) -> RpcLayoutDigest {
RpcLayoutDigest {
current_version: self.current().version,
active_versions: self.versions.len(),
trackers_hash: self.trackers_hash,
staging_hash: self.staging_hash,
}
}
// ------------------ helpers for update tracking ---------------
pub(crate) fn update_trackers(&mut self, local_node_id: Uuid) {
// Ensure trackers for this node's values are up-to-date
// 1. Acknowledge the last layout version which is not currently
// locked by an in-progress write operation
self.ack_max_free(local_node_id);
// 2. Assume the data on this node is sync'ed up at least to
// the first layout version in the history
self.sync_first(local_node_id);
// 3. Acknowledge everyone has synced up to min(self.sync_map)
self.sync_ack(local_node_id);
debug!("ack_map: {:?}", self.update_trackers.ack_map);
debug!("sync_map: {:?}", self.update_trackers.sync_map);
debug!("sync_ack_map: {:?}", self.update_trackers.sync_ack_map);
}
fn sync_first(&mut self, local_node_id: Uuid) {
let first_version = self.min_stored();
self.update(|layout| {
layout
.update_trackers
.sync_map
.set_max(local_node_id, first_version)
});
}
fn sync_ack(&mut self, local_node_id: Uuid) {
let sync_map_min = self.sync_map_min;
self.update(|layout| {
layout
.update_trackers
.sync_ack_map
.set_max(local_node_id, sync_map_min)
});
}
pub(crate) fn ack_max_free(&mut self, local_node_id: Uuid) -> bool {
let max_ack = self.max_free_ack();
let changed = self.update(|layout| {
layout
.update_trackers
.ack_map
.set_max(local_node_id, max_ack)
});
if changed {
info!("ack_until updated to {}", max_ack);
}
changed
}
pub(crate) fn max_free_ack(&self) -> u64 {
self.layout()
.versions
.iter()
.map(|x| x.version)
.skip_while(|v| {
self.ack_lock
.get(v)
.map(|x| x.load(Ordering::Relaxed) == 0)
.unwrap_or(true)
})
.next()
.unwrap_or(self.current().version)
}
}

306
src/rpc/layout/history.rs Normal file
View file

@ -0,0 +1,306 @@
use std::collections::HashSet;
use garage_util::crdt::{Crdt, Lww, LwwMap};
use garage_util::data::*;
use garage_util::encode::nonversioned_encode;
use garage_util::error::*;
use super::*;
use crate::replication_mode::ReplicationMode;
impl LayoutHistory {
pub fn new(replication_factor: usize) -> Self {
let version = LayoutVersion::new(replication_factor);
let staging = LayoutStaging {
parameters: Lww::<LayoutParameters>::new(version.parameters),
roles: LwwMap::new(),
};
LayoutHistory {
versions: vec![version],
old_versions: vec![],
update_trackers: Default::default(),
staging: Lww::raw(0, staging),
}
}
// ------------------ who stores what now? ---------------
pub fn current(&self) -> &LayoutVersion {
self.versions.last().as_ref().unwrap()
}
pub fn min_stored(&self) -> u64 {
self.versions.first().as_ref().unwrap().version
}
pub fn get_all_nodes(&self) -> Vec<Uuid> {
if self.versions.len() == 1 {
self.versions[0].all_nodes().to_vec()
} else {
let set = self
.versions
.iter()
.flat_map(|x| x.all_nodes())
.collect::<HashSet<_>>();
set.into_iter().copied().collect::<Vec<_>>()
}
}
pub(crate) fn get_all_nongateway_nodes(&self) -> Vec<Uuid> {
if self.versions.len() == 1 {
self.versions[0].nongateway_nodes().to_vec()
} else {
let set = self
.versions
.iter()
.flat_map(|x| x.nongateway_nodes())
.collect::<HashSet<_>>();
set.into_iter().copied().collect::<Vec<_>>()
}
}
// ---- housekeeping (all invoked by LayoutHelper) ----
pub(crate) fn keep_current_version_only(&mut self) {
while self.versions.len() > 1 {
let removed = self.versions.remove(0);
self.old_versions.push(removed);
}
}
pub(crate) fn cleanup_old_versions(&mut self) {
// If there are invalid versions before valid versions, remove them
if self.versions.len() > 1 && self.current().check().is_ok() {
while self.versions.len() > 1 && self.versions.first().unwrap().check().is_err() {
let removed = self.versions.remove(0);
info!(
"Layout history: pruning old invalid version {}",
removed.version
);
}
}
// If there are old versions that no one is reading from anymore,
// remove them (keep them in self.old_versions).
// ASSUMPTION: we only care about where nodes in the current layout version
// are reading from, as we assume older nodes are being discarded.
let current_nodes = &self.current().node_id_vec;
let min_version = self.min_stored();
let sync_ack_map_min = self
.update_trackers
.sync_ack_map
.min_among(current_nodes, min_version);
while self.min_stored() < sync_ack_map_min {
assert!(self.versions.len() > 1);
let removed = self.versions.remove(0);
info!(
"Layout history: moving version {} to old_versions",
removed.version
);
self.old_versions.push(removed);
}
while self.old_versions.len() > OLD_VERSION_COUNT {
let removed = self.old_versions.remove(0);
info!("Layout history: removing old_version {}", removed.version);
}
}
pub(crate) fn clamp_update_trackers(&mut self, nodes: &[Uuid]) {
let min_v = self.min_stored();
for node in nodes {
self.update_trackers.ack_map.set_max(*node, min_v);
self.update_trackers.sync_map.set_max(*node, min_v);
self.update_trackers.sync_ack_map.set_max(*node, min_v);
}
}
pub(crate) fn calculate_sync_map_min_with_quorum(
&self,
replication_mode: ReplicationMode,
all_nongateway_nodes: &[Uuid],
) -> u64 {
// This function calculates the minimum layout version from which
// it is safe to read if we want to maintain read-after-write consistency.
// In the general case the computation can be a bit expensive so
// we try to optimize it in several ways.
// If there is only one layout version, we know that's the one
// we need to read from.
if self.versions.len() == 1 {
return self.current().version;
}
let quorum = replication_mode.write_quorum();
let min_version = self.min_stored();
let global_min = self
.update_trackers
.sync_map
.min_among(all_nongateway_nodes, min_version);
// If the write quorums are equal to the total number of nodes,
// i.e. no writes can succeed while they are not written to all nodes,
// then we must in all case wait for all nodes to complete a sync.
// This is represented by reading from the layout with version
// number global_min, the smallest layout version for which all nodes
// have completed a sync.
if quorum == self.current().replication_factor {
return global_min;
}
// In the general case, we need to look at all write sets for all partitions,
// and find a safe layout version to read for that partition. We then
// take the minimum value among all partition as the safe layout version
// to read in all cases (the layout version to which all reads are directed).
let mut current_min = self.current().version;
let mut sets_done = HashSet::<Vec<Uuid>>::new();
for (_, p_hash) in self.current().partitions() {
for v in self.versions.iter() {
if v.version == self.current().version {
// We don't care about whether nodes in the latest layout version
// have completed a sync or not, as the sync is push-only
// and by definition nodes in the latest layout version do not
// hold data that must be pushed to nodes in the latest layout
// version, since that's the same version (any data that's
// already in the latest version is assumed to have been written
// by an operation that ensured a quorum of writes within
// that version).
continue;
}
// Determine set of nodes for partition p in layout version v.
// Sort the node set to avoid duplicate computations.
let mut set = v
.nodes_of(&p_hash, v.replication_factor)
.collect::<Vec<Uuid>>();
set.sort();
// If this set was already processed, skip it.
if sets_done.contains(&set) {
continue;
}
// Find the value of the sync update trackers that is the
// highest possible minimum within a quorum of nodes.
let mut sync_values = set
.iter()
.map(|x| self.update_trackers.sync_map.get(x, min_version))
.collect::<Vec<_>>();
sync_values.sort();
let set_min = sync_values[sync_values.len() - quorum];
if set_min < current_min {
current_min = set_min;
}
// defavorable case, we know we are at the smallest possible version,
// so we can stop early
assert!(current_min >= global_min);
if current_min == global_min {
return current_min;
}
// Add set to already processed sets
sets_done.insert(set);
}
}
current_min
}
pub(crate) fn calculate_trackers_hash(&self) -> Hash {
blake2sum(&nonversioned_encode(&self.update_trackers).unwrap()[..])
}
pub(crate) fn calculate_staging_hash(&self) -> Hash {
blake2sum(&nonversioned_encode(&self.staging).unwrap()[..])
}
// ================== updates to layout, public interface ===================
pub fn merge(&mut self, other: &LayoutHistory) -> bool {
let mut changed = false;
// Add any new versions to history
for v2 in other.versions.iter() {
if let Some(v1) = self.versions.iter().find(|v| v.version == v2.version) {
// Version is already present, check consistency
if v1 != v2 {
error!("Inconsistent layout histories: different layout compositions for version {}. Your cluster will be broken as long as this layout version is not replaced.", v2.version);
}
} else if self.versions.iter().all(|v| v.version != v2.version - 1) {
error!(
"Cannot receive new layout version {}, version {} is missing",
v2.version,
v2.version - 1
);
} else {
self.versions.push(v2.clone());
changed = true;
}
}
// Merge trackers
let c = self.update_trackers.merge(&other.update_trackers);
changed = changed || c;
// Merge staged layout changes
if self.staging != other.staging {
let prev_staging = self.staging.clone();
self.staging.merge(&other.staging);
changed = changed || self.staging != prev_staging;
}
changed
}
pub fn apply_staged_changes(mut self, version: Option<u64>) -> Result<(Self, Message), Error> {
match version {
None => {
let error = r#"
Please pass the new layout version number to ensure that you are writing the correct version of the cluster layout.
To know the correct value of the new layout version, invoke `garage layout show` and review the proposed changes.
"#;
return Err(Error::Message(error.into()));
}
Some(v) => {
if v != self.current().version + 1 {
return Err(Error::Message("Invalid new layout version".into()));
}
}
}
// Compute new version and add it to history
let (new_version, msg) = self
.current()
.clone()
.calculate_next_version(self.staging.get())?;
self.versions.push(new_version);
self.cleanup_old_versions();
// Reset the staged layout changes
self.staging.update(LayoutStaging {
parameters: self.staging.get().parameters.clone(),
roles: LwwMap::new(),
});
Ok((self, msg))
}
pub fn revert_staged_changes(mut self) -> Result<Self, Error> {
self.staging.update(LayoutStaging {
parameters: Lww::new(self.current().parameters),
roles: LwwMap::new(),
});
Ok(self)
}
pub fn check(&self) -> Result<(), String> {
// TODO: anything more ?
self.current().check()
}
}

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use std::collections::HashMap;
use std::sync::{atomic::Ordering, Arc, Mutex, RwLock, RwLockReadGuard};
use std::time::Duration;
use tokio::sync::Notify;
use netapp::endpoint::Endpoint;
use netapp::peering::fullmesh::FullMeshPeeringStrategy;
use netapp::NodeID;
use garage_util::config::Config;
use garage_util::data::*;
use garage_util::error::*;
use garage_util::persister::Persister;
use super::*;
use crate::replication_mode::ReplicationMode;
use crate::rpc_helper::*;
use crate::system::*;
pub struct LayoutManager {
node_id: Uuid,
replication_mode: ReplicationMode,
persist_cluster_layout: Persister<LayoutHistory>,
layout: Arc<RwLock<LayoutHelper>>,
pub(crate) change_notify: Arc<Notify>,
table_sync_version: Mutex<HashMap<String, u64>>,
pub(crate) rpc_helper: RpcHelper,
system_endpoint: Arc<Endpoint<SystemRpc, System>>,
}
impl LayoutManager {
pub fn new(
config: &Config,
node_id: NodeID,
system_endpoint: Arc<Endpoint<SystemRpc, System>>,
fullmesh: Arc<FullMeshPeeringStrategy>,
replication_mode: ReplicationMode,
) -> Result<Arc<Self>, Error> {
let replication_factor = replication_mode.replication_factor();
let persist_cluster_layout: Persister<LayoutHistory> =
Persister::new(&config.metadata_dir, "cluster_layout");
let cluster_layout = match persist_cluster_layout.load() {
Ok(x) => {
if x.current().replication_factor != replication_mode.replication_factor() {
return Err(Error::Message(format!(
"Prevous cluster layout has replication factor {}, which is different than the one specified in the config file ({}). The previous cluster layout can be purged, if you know what you are doing, simply by deleting the `cluster_layout` file in your metadata directory.",
x.current().replication_factor,
replication_factor
)));
}
x
}
Err(e) => {
info!(
"No valid previous cluster layout stored ({}), starting fresh.",
e
);
LayoutHistory::new(replication_factor)
}
};
let mut cluster_layout =
LayoutHelper::new(replication_mode, cluster_layout, Default::default());
cluster_layout.update_trackers(node_id.into());
let layout = Arc::new(RwLock::new(cluster_layout));
let change_notify = Arc::new(Notify::new());
let rpc_helper = RpcHelper::new(
node_id.into(),
fullmesh,
layout.clone(),
config.rpc_timeout_msec.map(Duration::from_millis),
);
Ok(Arc::new(Self {
node_id: node_id.into(),
replication_mode,
persist_cluster_layout,
layout,
change_notify,
table_sync_version: Mutex::new(HashMap::new()),
system_endpoint,
rpc_helper,
}))
}
// ---- PUBLIC INTERFACE ----
pub fn layout(&self) -> RwLockReadGuard<'_, LayoutHelper> {
self.layout.read().unwrap()
}
pub async fn update_cluster_layout(
self: &Arc<Self>,
layout: &LayoutHistory,
) -> Result<(), Error> {
self.handle_advertise_cluster_layout(layout).await?;
Ok(())
}
pub fn add_table(&self, table_name: &'static str) {
let first_version = self.layout().versions.first().unwrap().version;
self.table_sync_version
.lock()
.unwrap()
.insert(table_name.to_string(), first_version);
}
pub fn sync_table_until(self: &Arc<Self>, table_name: &'static str, version: u64) {
let mut table_sync_version = self.table_sync_version.lock().unwrap();
*table_sync_version.get_mut(table_name).unwrap() = version;
let sync_until = table_sync_version.iter().map(|(_, v)| *v).min().unwrap();
drop(table_sync_version);
let mut layout = self.layout.write().unwrap();
if layout.update(|l| l.update_trackers.sync_map.set_max(self.node_id, sync_until)) {
info!("sync_until updated to {}", sync_until);
self.broadcast_update(SystemRpc::AdvertiseClusterLayoutTrackers(
layout.update_trackers.clone(),
));
}
}
fn ack_new_version(self: &Arc<Self>) {
let mut layout = self.layout.write().unwrap();
if layout.ack_max_free(self.node_id) {
self.broadcast_update(SystemRpc::AdvertiseClusterLayoutTrackers(
layout.update_trackers.clone(),
));
}
}
// ---- ACK LOCKING ----
pub fn write_sets_of(self: &Arc<Self>, position: &Hash) -> WriteLock<Vec<Vec<Uuid>>> {
let layout = self.layout();
let version = layout.current().version;
let nodes = layout.storage_sets_of(position);
layout
.ack_lock
.get(&version)
.unwrap()
.fetch_add(1, Ordering::Relaxed);
WriteLock::new(version, self, nodes)
}
// ---- INTERNALS ---
fn merge_layout(&self, adv: &LayoutHistory) -> Option<LayoutHistory> {
let mut layout = self.layout.write().unwrap();
let prev_digest = layout.digest();
let prev_layout_check = layout.check().is_ok();
if !prev_layout_check || adv.check().is_ok() {
if layout.update(|l| l.merge(adv)) {
layout.update_trackers(self.node_id);
if prev_layout_check && layout.check().is_err() {
panic!("Merged two correct layouts and got an incorrect layout.");
}
assert!(layout.digest() != prev_digest);
return Some(layout.clone());
}
}
None
}
fn merge_layout_trackers(&self, adv: &UpdateTrackers) -> Option<UpdateTrackers> {
let mut layout = self.layout.write().unwrap();
let prev_digest = layout.digest();
if layout.update_trackers != *adv {
if layout.update(|l| l.update_trackers.merge(adv)) {
layout.update_trackers(self.node_id);
assert!(layout.digest() != prev_digest);
return Some(layout.update_trackers.clone());
}
}
None
}
async fn pull_cluster_layout(self: &Arc<Self>, peer: Uuid) {
let resp = self
.rpc_helper
.call(
&self.system_endpoint,
peer,
SystemRpc::PullClusterLayout,
RequestStrategy::with_priority(PRIO_HIGH),
)
.await;
if let Ok(SystemRpc::AdvertiseClusterLayout(layout)) = resp {
if let Err(e) = self.handle_advertise_cluster_layout(&layout).await {
warn!("In pull_cluster_layout: {}", e);
}
}
}
async fn pull_cluster_layout_trackers(self: &Arc<Self>, peer: Uuid) {
let resp = self
.rpc_helper
.call(
&self.system_endpoint,
peer,
SystemRpc::PullClusterLayoutTrackers,
RequestStrategy::with_priority(PRIO_HIGH),
)
.await;
if let Ok(SystemRpc::AdvertiseClusterLayoutTrackers(trackers)) = resp {
if let Err(e) = self
.handle_advertise_cluster_layout_trackers(&trackers)
.await
{
warn!("In pull_cluster_layout_trackers: {}", e);
}
}
}
/// Save cluster layout data to disk
async fn save_cluster_layout(&self) -> Result<(), Error> {
let layout = self.layout.read().unwrap().clone();
self.persist_cluster_layout
.save_async(&layout)
.await
.expect("Cannot save current cluster layout");
Ok(())
}
fn broadcast_update(self: &Arc<Self>, rpc: SystemRpc) {
tokio::spawn({
let this = self.clone();
async move {
if let Err(e) = this
.rpc_helper
.broadcast(
&this.system_endpoint,
rpc,
RequestStrategy::with_priority(PRIO_HIGH),
)
.await
{
warn!("Error while broadcasting new cluster layout: {}", e);
}
}
});
}
// ---- RPC HANDLERS ----
pub(crate) fn handle_advertise_status(self: &Arc<Self>, from: Uuid, remote: &RpcLayoutDigest) {
let local = self.layout().digest();
if remote.current_version > local.current_version
|| remote.active_versions != local.active_versions
|| remote.staging_hash != local.staging_hash
{
tokio::spawn({
let this = self.clone();
async move { this.pull_cluster_layout(from).await }
});
} else if remote.trackers_hash != local.trackers_hash {
tokio::spawn({
let this = self.clone();
async move { this.pull_cluster_layout_trackers(from).await }
});
}
}
pub(crate) fn handle_pull_cluster_layout(&self) -> SystemRpc {
let layout = self.layout.read().unwrap().clone();
SystemRpc::AdvertiseClusterLayout(layout)
}
pub(crate) fn handle_pull_cluster_layout_trackers(&self) -> SystemRpc {
let layout = self.layout.read().unwrap();
SystemRpc::AdvertiseClusterLayoutTrackers(layout.update_trackers.clone())
}
pub(crate) async fn handle_advertise_cluster_layout(
self: &Arc<Self>,
adv: &LayoutHistory,
) -> Result<SystemRpc, Error> {
debug!(
"handle_advertise_cluster_layout: {} versions, last={}, trackers={:?}",
adv.versions.len(),
adv.current().version,
adv.update_trackers
);
if adv.current().replication_factor != self.replication_mode.replication_factor() {
let msg = format!(
"Received a cluster layout from another node with replication factor {}, which is different from what we have in our configuration ({}). Discarding the cluster layout we received.",
adv.current().replication_factor,
self.replication_mode.replication_factor()
);
error!("{}", msg);
return Err(Error::Message(msg));
}
if let Some(new_layout) = self.merge_layout(adv) {
debug!("handle_advertise_cluster_layout: some changes were added to the current stuff");
self.change_notify.notify_waiters();
self.broadcast_update(SystemRpc::AdvertiseClusterLayout(new_layout));
self.save_cluster_layout().await?;
}
Ok(SystemRpc::Ok)
}
pub(crate) async fn handle_advertise_cluster_layout_trackers(
self: &Arc<Self>,
trackers: &UpdateTrackers,
) -> Result<SystemRpc, Error> {
debug!("handle_advertise_cluster_layout_trackers: {:?}", trackers);
if let Some(new_trackers) = self.merge_layout_trackers(trackers) {
self.change_notify.notify_waiters();
self.broadcast_update(SystemRpc::AdvertiseClusterLayoutTrackers(new_trackers));
self.save_cluster_layout().await?;
}
Ok(SystemRpc::Ok)
}
}
// ---- ack lock ----
pub struct WriteLock<T> {
layout_version: u64,
layout_manager: Arc<LayoutManager>,
value: T,
}
impl<T> WriteLock<T> {
fn new(version: u64, layout_manager: &Arc<LayoutManager>, value: T) -> Self {
Self {
layout_version: version,
layout_manager: layout_manager.clone(),
value,
}
}
}
impl<T> AsRef<T> for WriteLock<T> {
fn as_ref(&self) -> &T {
&self.value
}
}
impl<T> AsMut<T> for WriteLock<T> {
fn as_mut(&mut self) -> &mut T {
&mut self.value
}
}
impl<T> Drop for WriteLock<T> {
fn drop(&mut self) {
let layout = self.layout_manager.layout(); // acquire read lock
if let Some(counter) = layout.ack_lock.get(&self.layout_version) {
let prev_lock = counter.fetch_sub(1, Ordering::Relaxed);
if prev_lock == 1 && layout.current().version > self.layout_version {
drop(layout); // release read lock, write lock will be acquired
self.layout_manager.ack_new_version();
}
} else {
error!("Could not find ack lock counter for layout version {}. This probably indicates a bug in Garage.", self.layout_version);
}
}
}

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use std::fmt;
use bytesize::ByteSize;
use garage_util::crdt::{AutoCrdt, Crdt};
use garage_util::data::Uuid;
mod graph_algo;
mod helper;
mod history;
mod version;
#[cfg(test)]
mod test;
pub mod manager;
// ---- re-exports ----
pub use helper::{LayoutHelper, RpcLayoutDigest, SyncLayoutDigest};
pub use manager::WriteLock;
pub use version::*;
// ---- defines: partitions ----
/// A partition id, which is stored on 16 bits
/// i.e. we have up to 2**16 partitions.
/// (in practice we have exactly 2**PARTITION_BITS partitions)
pub type Partition = u16;
// TODO: make this constant parametrizable in the config file
// For deployments with many nodes it might make sense to bump
// it up to 10.
// Maximum value : 16
/// How many bits from the hash are used to make partitions. Higher numbers means more fairness in
/// presence of numerous nodes, but exponentially bigger ring. Max 16
pub const PARTITION_BITS: usize = 8;
const NB_PARTITIONS: usize = 1usize << PARTITION_BITS;
// ---- defines: nodes ----
// Type to store compactly the id of a node in the system
// Change this to u16 the day we want to have more than 256 nodes in a cluster
pub type CompactNodeType = u8;
pub const MAX_NODE_NUMBER: usize = 256;
// ======== actual data structures for the layout data ========
// ======== that is persisted to disk ========
// some small utility impls are at the end of this file,
// but most of the code that actually computes stuff is in
// version.rs, history.rs and helper.rs
mod v08 {
use crate::layout::CompactNodeType;
use garage_util::crdt::LwwMap;
use garage_util::data::{Hash, Uuid};
use serde::{Deserialize, Serialize};
/// The layout of the cluster, i.e. the list of roles
/// which are assigned to each cluster node
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct ClusterLayout {
pub version: u64,
pub replication_factor: usize,
pub roles: LwwMap<Uuid, NodeRoleV>,
// see comments in v010::ClusterLayout
pub node_id_vec: Vec<Uuid>,
#[serde(with = "serde_bytes")]
pub ring_assignation_data: Vec<CompactNodeType>,
/// Role changes which are staged for the next version of the layout
pub staging: LwwMap<Uuid, NodeRoleV>,
pub staging_hash: Hash,
}
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Debug, Serialize, Deserialize)]
pub struct NodeRoleV(pub Option<NodeRole>);
/// The user-assigned roles of cluster nodes
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Debug, Serialize, Deserialize)]
pub struct NodeRole {
/// Datacenter at which this entry belong. This information is used to
/// perform a better geodistribution
pub zone: String,
/// The capacity of the node
/// If this is set to None, the node does not participate in storing data for the system
/// and is only active as an API gateway to other nodes
pub capacity: Option<u64>,
/// A set of tags to recognize the node
pub tags: Vec<String>,
}
impl garage_util::migrate::InitialFormat for ClusterLayout {}
}
mod v09 {
use super::v08;
use crate::layout::CompactNodeType;
use garage_util::crdt::{Lww, LwwMap};
use garage_util::data::{Hash, Uuid};
use serde::{Deserialize, Serialize};
pub use v08::{NodeRole, NodeRoleV};
/// The layout of the cluster, i.e. the list of roles
/// which are assigned to each cluster node
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct ClusterLayout {
pub version: u64,
pub replication_factor: usize,
/// This attribute is only used to retain the previously computed partition size,
/// to know to what extent does it change with the layout update.
pub partition_size: u64,
/// Parameters used to compute the assignment currently given by
/// ring_assignment_data
pub parameters: LayoutParameters,
pub roles: LwwMap<Uuid, NodeRoleV>,
// see comments in v010::ClusterLayout
pub node_id_vec: Vec<Uuid>,
#[serde(with = "serde_bytes")]
pub ring_assignment_data: Vec<CompactNodeType>,
/// Parameters to be used in the next partition assignment computation.
pub staging_parameters: Lww<LayoutParameters>,
/// Role changes which are staged for the next version of the layout
pub staging_roles: LwwMap<Uuid, NodeRoleV>,
pub staging_hash: Hash,
}
/// This struct is used to set the parameters to be used in the assignment computation
/// algorithm. It is stored as a Crdt.
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Debug, Serialize, Deserialize)]
pub struct LayoutParameters {
pub zone_redundancy: ZoneRedundancy,
}
/// Zone redundancy: if set to AtLeast(x), the layout calculation will aim to store copies
/// of each partition on at least that number of different zones.
/// Otherwise, copies will be stored on the maximum possible number of zones.
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Debug, Serialize, Deserialize)]
pub enum ZoneRedundancy {
AtLeast(usize),
Maximum,
}
impl garage_util::migrate::Migrate for ClusterLayout {
const VERSION_MARKER: &'static [u8] = b"G09layout";
type Previous = v08::ClusterLayout;
fn migrate(previous: Self::Previous) -> Self {
use itertools::Itertools;
// In the old layout, capacities are in an arbitrary unit,
// but in the new layout they are in bytes.
// Here we arbitrarily multiply everything by 1G,
// such that 1 old capacity unit = 1GB in the new units.
// This is totally arbitrary and won't work for most users.
let cap_mul = 1024 * 1024 * 1024;
let roles = multiply_all_capacities(previous.roles, cap_mul);
let staging_roles = multiply_all_capacities(previous.staging, cap_mul);
let node_id_vec = previous.node_id_vec;
// Determine partition size
let mut tmp = previous.ring_assignation_data.clone();
tmp.sort();
let partition_size = tmp
.into_iter()
.dedup_with_count()
.map(|(npart, node)| {
roles
.get(&node_id_vec[node as usize])
.and_then(|p| p.0.as_ref().and_then(|r| r.capacity))
.unwrap_or(0) / npart as u64
})
.min()
.unwrap_or(0);
// By default, zone_redundancy is maximum possible value
let parameters = LayoutParameters {
zone_redundancy: ZoneRedundancy::Maximum,
};
Self {
version: previous.version,
replication_factor: previous.replication_factor,
partition_size,
parameters,
roles,
node_id_vec,
ring_assignment_data: previous.ring_assignation_data,
staging_parameters: Lww::new(parameters),
staging_roles,
staging_hash: [0u8; 32].into(), // will be set in the next migration
}
}
}
fn multiply_all_capacities(
old_roles: LwwMap<Uuid, NodeRoleV>,
mul: u64,
) -> LwwMap<Uuid, NodeRoleV> {
let mut new_roles = LwwMap::new();
for (node, ts, role) in old_roles.items() {
let mut role = role.clone();
if let NodeRoleV(Some(NodeRole {
capacity: Some(ref mut cap),
..
})) = role
{
*cap *= mul;
}
new_roles.merge_raw(node, *ts, &role);
}
new_roles
}
}
mod v010 {
use super::v09;
use crate::layout::CompactNodeType;
use garage_util::crdt::{Lww, LwwMap};
use garage_util::data::Uuid;
use serde::{Deserialize, Serialize};
use std::collections::BTreeMap;
pub use v09::{LayoutParameters, NodeRole, NodeRoleV, ZoneRedundancy};
/// Number of old (non-live) versions to keep, see LayoutHistory::old_versions
pub const OLD_VERSION_COUNT: usize = 5;
/// The history of cluster layouts, with trackers to keep a record
/// of which nodes are up-to-date to current cluster data
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct LayoutHistory {
/// The versions currently in use in the cluster
pub versions: Vec<LayoutVersion>,
/// At most 5 of the previous versions, not used by the garage_table
/// module, but usefull for the garage_block module to find data blocks
/// that have not yet been moved
pub old_versions: Vec<LayoutVersion>,
/// Update trackers
pub update_trackers: UpdateTrackers,
/// Staged changes for the next version
pub staging: Lww<LayoutStaging>,
}
/// A version of the layout of the cluster, i.e. the list of roles
/// which are assigned to each cluster node
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct LayoutVersion {
/// The number of this version
pub version: u64,
/// Roles assigned to nodes in this version
pub roles: LwwMap<Uuid, NodeRoleV>,
/// Parameters used to compute the assignment currently given by
/// ring_assignment_data
pub parameters: LayoutParameters,
/// The number of replicas for each data partition
pub replication_factor: usize,
/// This attribute is only used to retain the previously computed partition size,
/// to know to what extent does it change with the layout update.
pub partition_size: u64,
/// node_id_vec: a vector of node IDs with a role assigned
/// in the system (this includes gateway nodes).
/// The order here is different than the vec stored by `roles`, because:
/// 1. non-gateway nodes are first so that they have lower numbers
/// 2. nodes that don't have a role are excluded (but they need to
/// stay in the CRDT as tombstones)
pub node_id_vec: Vec<Uuid>,
/// number of non-gateway nodes, which are the first ids in node_id_vec
pub nongateway_node_count: usize,
/// The assignation of data partitions to nodes, the values
/// are indices in node_id_vec
#[serde(with = "serde_bytes")]
pub ring_assignment_data: Vec<CompactNodeType>,
}
/// The staged changes for the next layout version
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct LayoutStaging {
/// Parameters to be used in the next partition assignment computation.
pub parameters: Lww<LayoutParameters>,
/// Role changes which are staged for the next version of the layout
pub roles: LwwMap<Uuid, NodeRoleV>,
}
/// The tracker of acknowlegments and data syncs around the cluster
#[derive(Clone, Debug, Serialize, Deserialize, Default, PartialEq)]
pub struct UpdateTrackers {
/// The highest layout version number each node has ack'ed
pub ack_map: UpdateTracker,
/// The highest layout version number each node has synced data for
pub sync_map: UpdateTracker,
/// The highest layout version number each node has
/// ack'ed that all other nodes have synced data for
pub sync_ack_map: UpdateTracker,
}
/// Generic update tracker struct
#[derive(Clone, Debug, Serialize, Deserialize, Default, PartialEq)]
pub struct UpdateTracker(pub BTreeMap<Uuid, u64>);
impl garage_util::migrate::Migrate for LayoutHistory {
const VERSION_MARKER: &'static [u8] = b"G010lh";
type Previous = v09::ClusterLayout;
fn migrate(previous: Self::Previous) -> Self {
let nongateway_node_count = previous
.node_id_vec
.iter()
.enumerate()
.filter(|(_, uuid)| {
let role = previous.roles.get(uuid);
matches!(role, Some(NodeRoleV(Some(role))) if role.capacity.is_some())
})
.map(|(i, _)| i + 1)
.max()
.unwrap_or(0);
let version = LayoutVersion {
version: previous.version,
replication_factor: previous.replication_factor,
partition_size: previous.partition_size,
parameters: previous.parameters,
roles: previous.roles,
node_id_vec: previous.node_id_vec,
nongateway_node_count,
ring_assignment_data: previous.ring_assignment_data,
};
let update_tracker = UpdateTracker(
version
.nongateway_nodes()
.iter()
.copied()
.map(|x| (x, version.version))
.collect::<BTreeMap<Uuid, u64>>(),
);
let staging = LayoutStaging {
parameters: previous.staging_parameters,
roles: previous.staging_roles,
};
Self {
versions: vec![version],
old_versions: vec![],
update_trackers: UpdateTrackers {
ack_map: update_tracker.clone(),
sync_map: update_tracker.clone(),
sync_ack_map: update_tracker,
},
staging: Lww::raw(previous.version, staging),
}
}
}
}
pub use v010::*;
// ---- utility functions ----
impl AutoCrdt for LayoutParameters {
const WARN_IF_DIFFERENT: bool = true;
}
impl AutoCrdt for NodeRoleV {
const WARN_IF_DIFFERENT: bool = true;
}
impl Crdt for LayoutStaging {
fn merge(&mut self, other: &LayoutStaging) {
self.parameters.merge(&other.parameters);
self.roles.merge(&other.roles);
}
}
impl NodeRole {
pub fn capacity_string(&self) -> String {
match self.capacity {
Some(c) => ByteSize::b(c).to_string_as(false),
None => "gateway".to_string(),
}
}
pub fn tags_string(&self) -> String {
self.tags.join(",")
}
}
impl fmt::Display for ZoneRedundancy {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
ZoneRedundancy::Maximum => write!(f, "maximum"),
ZoneRedundancy::AtLeast(x) => write!(f, "{}", x),
}
}
}
impl core::str::FromStr for ZoneRedundancy {
type Err = &'static str;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"none" | "max" | "maximum" => Ok(ZoneRedundancy::Maximum),
x => {
let v = x
.parse::<usize>()
.map_err(|_| "zone redundancy must be 'none'/'max' or an integer")?;
Ok(ZoneRedundancy::AtLeast(v))
}
}
}
}
impl UpdateTracker {
fn merge(&mut self, other: &UpdateTracker) -> bool {
let mut changed = false;
for (k, v) in other.0.iter() {
if let Some(v_mut) = self.0.get_mut(k) {
if *v > *v_mut {
*v_mut = *v;
changed = true;
}
} else {
self.0.insert(*k, *v);
changed = true;
}
}
changed
}
/// This bumps the update tracker for a given node up to the specified value.
/// This has potential impacts on the correctness of Garage and should only
/// be used in very specific circumstances.
pub fn set_max(&mut self, peer: Uuid, value: u64) -> bool {
match self.0.get_mut(&peer) {
Some(e) if *e < value => {
*e = value;
true
}
None => {
self.0.insert(peer, value);
true
}
_ => false,
}
}
pub(crate) fn min_among(&self, storage_nodes: &[Uuid], min_version: u64) -> u64 {
storage_nodes
.iter()
.map(|x| self.get(x, min_version))
.min()
.unwrap_or(min_version)
}
pub fn get(&self, node: &Uuid, min_version: u64) -> u64 {
self.0.get(node).copied().unwrap_or(min_version)
}
}
impl UpdateTrackers {
pub(crate) fn merge(&mut self, other: &UpdateTrackers) -> bool {
let c1 = self.ack_map.merge(&other.ack_map);
let c2 = self.sync_map.merge(&other.sync_map);
let c3 = self.sync_ack_map.merge(&other.sync_ack_map);
c1 || c2 || c3
}
}

157
src/rpc/layout/test.rs Normal file
View file

@ -0,0 +1,157 @@
use std::cmp::min;
use std::collections::HashMap;
use garage_util::crdt::Crdt;
use garage_util::error::*;
use crate::layout::*;
// This function checks that the partition size S computed is at least better than the
// one given by a very naive algorithm. To do so, we try to run the naive algorithm
// assuming a partion size of S+1. If we succed, it means that the optimal assignment
// was not optimal. The naive algorithm is the following :
// - we compute the max number of partitions associated to every node, capped at the
// partition number. It gives the number of tokens of every node.
// - every zone has a number of tokens equal to the sum of the tokens of its nodes.
// - we cycle over the partitions and associate zone tokens while respecting the
// zone redundancy constraint.
// NOTE: the naive algorithm is not optimal. Counter example:
// take nb_partition = 3 ; replication_factor = 5; redundancy = 4;
// number of tokens by zone : (A, 4), (B,1), (C,4), (D, 4), (E, 2)
// With these parameters, the naive algo fails, whereas there is a solution:
// (A,A,C,D,E) , (A,B,C,D,D) (A,C,C,D,E)
fn check_against_naive(cl: &LayoutVersion) -> Result<bool, Error> {
let over_size = cl.partition_size + 1;
let mut zone_token = HashMap::<String, usize>::new();
let (zones, zone_to_id) = cl.generate_nongateway_zone_ids()?;
if zones.is_empty() {
return Ok(false);
}
for z in zones.iter() {
zone_token.insert(z.clone(), 0);
}
for uuid in cl.nongateway_nodes() {
let z = cl.expect_get_node_zone(&uuid);
let c = cl.expect_get_node_capacity(&uuid);
zone_token.insert(
z.to_string(),
zone_token[z] + min(NB_PARTITIONS, (c / over_size) as usize),
);
}
// For every partition, we count the number of zone already associated and
// the name of the last zone associated
let mut id_zone_token = vec![0; zones.len()];
for (z, t) in zone_token.iter() {
id_zone_token[zone_to_id[z]] = *t;
}
let mut nb_token = vec![0; NB_PARTITIONS];
let mut last_zone = vec![zones.len(); NB_PARTITIONS];
let mut curr_zone = 0;
let redundancy = cl.effective_zone_redundancy();
for replic in 0..cl.replication_factor {
for p in 0..NB_PARTITIONS {
while id_zone_token[curr_zone] == 0
|| (last_zone[p] == curr_zone
&& redundancy - nb_token[p] <= cl.replication_factor - replic)
{
curr_zone += 1;
if curr_zone >= zones.len() {
return Ok(true);
}
}
id_zone_token[curr_zone] -= 1;
if last_zone[p] != curr_zone {
nb_token[p] += 1;
last_zone[p] = curr_zone;
}
}
}
return Ok(false);
}
fn show_msg(msg: &Message) {
for s in msg.iter() {
println!("{}", s);
}
}
fn update_layout(
cl: &mut LayoutHistory,
node_capacity_vec: &[u64],
node_zone_vec: &[&'static str],
zone_redundancy: usize,
) {
let staging = cl.staging.get_mut();
for (i, (capacity, zone)) in node_capacity_vec
.iter()
.zip(node_zone_vec.iter())
.enumerate()
{
let node_id = [i as u8; 32].into();
let update = staging.roles.update_mutator(
node_id,
NodeRoleV(Some(NodeRole {
zone: zone.to_string(),
capacity: Some(*capacity),
tags: (vec![]),
})),
);
staging.roles.merge(&update);
}
staging.parameters.update(LayoutParameters {
zone_redundancy: ZoneRedundancy::AtLeast(zone_redundancy),
});
}
#[test]
fn test_assignment() {
let mut node_capacity_vec = vec![4000, 1000, 2000];
let mut node_zone_vec = vec!["A", "B", "C"];
let mut cl = LayoutHistory::new(3);
update_layout(&mut cl, &node_capacity_vec, &node_zone_vec, 3);
let v = cl.current().version;
let (mut cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
show_msg(&msg);
assert_eq!(cl.check(), Ok(()));
assert!(check_against_naive(cl.current()).unwrap());
node_capacity_vec = vec![4000, 1000, 1000, 3000, 1000, 1000, 2000, 10000, 2000];
node_zone_vec = vec!["A", "B", "C", "C", "C", "B", "G", "H", "I"];
update_layout(&mut cl, &node_capacity_vec, &node_zone_vec, 2);
let v = cl.current().version;
let (mut cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
show_msg(&msg);
assert_eq!(cl.check(), Ok(()));
assert!(check_against_naive(cl.current()).unwrap());
node_capacity_vec = vec![4000, 1000, 2000, 7000, 1000, 1000, 2000, 10000, 2000];
update_layout(&mut cl, &node_capacity_vec, &node_zone_vec, 3);
let v = cl.current().version;
let (mut cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
show_msg(&msg);
assert_eq!(cl.check(), Ok(()));
assert!(check_against_naive(cl.current()).unwrap());
node_capacity_vec = vec![
4000000, 4000000, 2000000, 7000000, 1000000, 9000000, 2000000, 10000, 2000000,
];
update_layout(&mut cl, &node_capacity_vec, &node_zone_vec, 1);
let v = cl.current().version;
let (cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
show_msg(&msg);
assert_eq!(cl.check(), Ok(()));
assert!(check_against_naive(cl.current()).unwrap());
}

713
src/rpc/layout.rs → src/rpc/layout/version.rs
View file

@ -1,375 +1,55 @@
use std::cmp::Ordering;
use std::collections::HashMap;
use std::collections::HashSet;
use std::fmt;
use std::convert::TryInto;
use bytesize::ByteSize;
use itertools::Itertools;
use garage_util::crdt::{AutoCrdt, Crdt, Lww, LwwMap};
use garage_util::crdt::{Crdt, LwwMap};
use garage_util::data::*;
use garage_util::encode::nonversioned_encode;
use garage_util::error::*;
use crate::graph_algo::*;
use crate::ring::*;
use std::convert::TryInto;
const NB_PARTITIONS: usize = 1usize << PARTITION_BITS;
use super::graph_algo::*;
use super::*;
// The Message type will be used to collect information on the algorithm.
type Message = Vec<String>;
pub type Message = Vec<String>;
mod v08 {
use crate::ring::CompactNodeType;
use garage_util::crdt::LwwMap;
use garage_util::data::{Hash, Uuid};
use serde::{Deserialize, Serialize};
/// The layout of the cluster, i.e. the list of roles
/// which are assigned to each cluster node
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct ClusterLayout {
pub version: u64,
pub replication_factor: usize,
pub roles: LwwMap<Uuid, NodeRoleV>,
/// node_id_vec: a vector of node IDs with a role assigned
/// in the system (this includes gateway nodes).
/// The order here is different than the vec stored by `roles`, because:
/// 1. non-gateway nodes are first so that they have lower numbers
/// 2. nodes that don't have a role are excluded (but they need to
/// stay in the CRDT as tombstones)
pub node_id_vec: Vec<Uuid>,
/// the assignation of data partitions to node, the values
/// are indices in node_id_vec
#[serde(with = "serde_bytes")]
pub ring_assignation_data: Vec<CompactNodeType>,
/// Role changes which are staged for the next version of the layout
pub staging: LwwMap<Uuid, NodeRoleV>,
pub staging_hash: Hash,
}
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Debug, Serialize, Deserialize)]
pub struct NodeRoleV(pub Option<NodeRole>);
/// The user-assigned roles of cluster nodes
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Debug, Serialize, Deserialize)]
pub struct NodeRole {
/// Datacenter at which this entry belong. This information is used to
/// perform a better geodistribution
pub zone: String,
/// The capacity of the node
/// If this is set to None, the node does not participate in storing data for the system
/// and is only active as an API gateway to other nodes
pub capacity: Option<u64>,
/// A set of tags to recognize the node
pub tags: Vec<String>,
}
impl garage_util::migrate::InitialFormat for ClusterLayout {}
}
mod v09 {
use super::v08;
use crate::ring::CompactNodeType;
use garage_util::crdt::{Lww, LwwMap};
use garage_util::data::{Hash, Uuid};
use serde::{Deserialize, Serialize};
pub use v08::{NodeRole, NodeRoleV};
/// The layout of the cluster, i.e. the list of roles
/// which are assigned to each cluster node
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct ClusterLayout {
pub version: u64,
pub replication_factor: usize,
/// This attribute is only used to retain the previously computed partition size,
/// to know to what extent does it change with the layout update.
pub partition_size: u64,
/// Parameters used to compute the assignment currently given by
/// ring_assignment_data
pub parameters: LayoutParameters,
pub roles: LwwMap<Uuid, NodeRoleV>,
/// see comment in v08::ClusterLayout
pub node_id_vec: Vec<Uuid>,
/// see comment in v08::ClusterLayout
#[serde(with = "serde_bytes")]
pub ring_assignment_data: Vec<CompactNodeType>,
/// Parameters to be used in the next partition assignment computation.
pub staging_parameters: Lww<LayoutParameters>,
/// Role changes which are staged for the next version of the layout
pub staging_roles: LwwMap<Uuid, NodeRoleV>,
pub staging_hash: Hash,
}
/// This struct is used to set the parameters to be used in the assignment computation
/// algorithm. It is stored as a Crdt.
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Debug, Serialize, Deserialize)]
pub struct LayoutParameters {
pub zone_redundancy: ZoneRedundancy,
}
/// Zone redundancy: if set to AtLeast(x), the layout calculation will aim to store copies
/// of each partition on at least that number of different zones.
/// Otherwise, copies will be stored on the maximum possible number of zones.
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Debug, Serialize, Deserialize)]
pub enum ZoneRedundancy {
AtLeast(usize),
Maximum,
}
impl garage_util::migrate::Migrate for ClusterLayout {
const VERSION_MARKER: &'static [u8] = b"G09layout";
type Previous = v08::ClusterLayout;
fn migrate(previous: Self::Previous) -> Self {
use itertools::Itertools;
// In the old layout, capacities are in an arbitrary unit,
// but in the new layout they are in bytes.
// Here we arbitrarily multiply everything by 1G,
// such that 1 old capacity unit = 1GB in the new units.
// This is totally arbitrary and won't work for most users.
let cap_mul = 1024 * 1024 * 1024;
let roles = multiply_all_capacities(previous.roles, cap_mul);
let staging_roles = multiply_all_capacities(previous.staging, cap_mul);
let node_id_vec = previous.node_id_vec;
// Determine partition size
let mut tmp = previous.ring_assignation_data.clone();
tmp.sort();
let partition_size = tmp
.into_iter()
.dedup_with_count()
.map(|(npart, node)| {
roles
.get(&node_id_vec[node as usize])
.and_then(|p| p.0.as_ref().and_then(|r| r.capacity))
.unwrap_or(0) / npart as u64
})
.min()
.unwrap_or(0);
// By default, zone_redundancy is maximum possible value
let parameters = LayoutParameters {
zone_redundancy: ZoneRedundancy::Maximum,
};
let mut res = Self {
version: previous.version,
replication_factor: previous.replication_factor,
partition_size,
parameters,
roles,
node_id_vec,
ring_assignment_data: previous.ring_assignation_data,
staging_parameters: Lww::new(parameters),
staging_roles,
staging_hash: [0u8; 32].into(),
};
res.staging_hash = res.calculate_staging_hash();
res
}
}
fn multiply_all_capacities(
old_roles: LwwMap<Uuid, NodeRoleV>,
mul: u64,
) -> LwwMap<Uuid, NodeRoleV> {
let mut new_roles = LwwMap::new();
for (node, ts, role) in old_roles.items() {
let mut role = role.clone();
if let NodeRoleV(Some(NodeRole {
capacity: Some(ref mut cap),
..
})) = role
{
*cap *= mul;
}
new_roles.merge_raw(node, *ts, &role);
}
new_roles
}
}
pub use v09::*;
impl AutoCrdt for LayoutParameters {
const WARN_IF_DIFFERENT: bool = true;
}
impl AutoCrdt for NodeRoleV {
const WARN_IF_DIFFERENT: bool = true;
}
impl NodeRole {
pub fn capacity_string(&self) -> String {
match self.capacity {
Some(c) => ByteSize::b(c).to_string_as(false),
None => "gateway".to_string(),
}
}
pub fn tags_string(&self) -> String {
self.tags.join(",")
}
}
impl fmt::Display for ZoneRedundancy {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
ZoneRedundancy::Maximum => write!(f, "maximum"),
ZoneRedundancy::AtLeast(x) => write!(f, "{}", x),
}
}
}
impl core::str::FromStr for ZoneRedundancy {
type Err = &'static str;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"none" | "max" | "maximum" => Ok(ZoneRedundancy::Maximum),
x => {
let v = x
.parse::<usize>()
.map_err(|_| "zone redundancy must be 'none'/'max' or an integer")?;
Ok(ZoneRedundancy::AtLeast(v))
}
}
}
}
// Implementation of the ClusterLayout methods unrelated to the assignment algorithm.
impl ClusterLayout {
impl LayoutVersion {
pub fn new(replication_factor: usize) -> Self {
// We set the default zone redundancy to be Maximum, meaning that the maximum
// possible value will be used depending on the cluster topology
let parameters = LayoutParameters {
zone_redundancy: ZoneRedundancy::Maximum,
};
let staging_parameters = Lww::<LayoutParameters>::new(parameters);
let empty_lwwmap = LwwMap::new();
let mut ret = ClusterLayout {
LayoutVersion {
version: 0,
replication_factor,
partition_size: 0,
roles: LwwMap::new(),
node_id_vec: Vec::new(),
nongateway_node_count: 0,
ring_assignment_data: Vec::new(),
parameters,
staging_parameters,
staging_roles: empty_lwwmap,
staging_hash: [0u8; 32].into(),
};
ret.staging_hash = ret.calculate_staging_hash();
ret
}
fn calculate_staging_hash(&self) -> Hash {
let hashed_tuple = (&self.staging_roles, &self.staging_parameters);
blake2sum(&nonversioned_encode(&hashed_tuple).unwrap()[..])
}
pub fn merge(&mut self, other: &ClusterLayout) -> bool {
match other.version.cmp(&self.version) {
Ordering::Greater => {
*self = other.clone();
true
}
Ordering::Equal => {
self.staging_parameters.merge(&other.staging_parameters);
self.staging_roles.merge(&other.staging_roles);
let new_staging_hash = self.calculate_staging_hash();
let changed = new_staging_hash != self.staging_hash;
self.staging_hash = new_staging_hash;
changed
}
Ordering::Less => false,
}
}
pub fn apply_staged_changes(mut self, version: Option<u64>) -> Result<(Self, Message), Error> {
match version {
None => {
let error = r#"
Please pass the new layout version number to ensure that you are writing the correct version of the cluster layout.
To know the correct value of the new layout version, invoke `garage layout show` and review the proposed changes.
"#;
return Err(Error::Message(error.into()));
}
Some(v) => {
if v != self.version + 1 {
return Err(Error::Message("Invalid new layout version".into()));
}
}
}
// ===================== accessors ======================
self.roles.merge(&self.staging_roles);
self.roles.retain(|(_, _, v)| v.0.is_some());
self.parameters = *self.staging_parameters.get();
self.staging_roles.clear();
self.staging_hash = self.calculate_staging_hash();
let msg = self.calculate_partition_assignment()?;
self.version += 1;
Ok((self, msg))
}
pub fn revert_staged_changes(mut self, version: Option<u64>) -> Result<Self, Error> {
match version {
None => {
let error = r#"
Please pass the new layout version number to ensure that you are writing the correct version of the cluster layout.
To know the correct value of the new layout version, invoke `garage layout show` and review the proposed changes.
"#;
return Err(Error::Message(error.into()));
}
Some(v) => {
if v != self.version + 1 {
return Err(Error::Message("Invalid new layout version".into()));
}
}
}
self.staging_roles.clear();
self.staging_parameters.update(self.parameters);
self.staging_hash = self.calculate_staging_hash();
self.version += 1;
Ok(self)
}
/// Returns a list of IDs of nodes that currently have
/// a role in the cluster
pub fn node_ids(&self) -> &[Uuid] {
/// Returns a list of IDs of nodes that have a role in this
/// version of the cluster layout, including gateway nodes
pub fn all_nodes(&self) -> &[Uuid] {
&self.node_id_vec[..]
}
pub fn num_nodes(&self) -> usize {
self.node_id_vec.len()
/// Returns a list of IDs of nodes that have a storage capacity
/// assigned in this version of the cluster layout
pub fn nongateway_nodes(&self) -> &[Uuid] {
&self.node_id_vec[..self.nongateway_node_count]
}
/// Returns the role of a node in the layout
/// Returns the role of a node in the layout, if it has one
pub fn node_role(&self, node: &Uuid) -> Option<&NodeRole> {
match self.roles.get(node) {
Some(NodeRoleV(Some(v))) => Some(v),
@ -377,41 +57,23 @@ To know the correct value of the new layout version, invoke `garage layout show`
}
}
/// Returns the uuids of the non_gateway nodes in self.node_id_vec.
fn nongateway_nodes(&self) -> Vec<Uuid> {
let mut result = Vec::<Uuid>::new();
for uuid in self.node_id_vec.iter() {
match self.node_role(uuid) {
Some(role) if role.capacity.is_some() => result.push(*uuid),
_ => (),
}
}
result
}
/// Given a node uuids, this function returns the label of its zone
fn get_node_zone(&self, uuid: &Uuid) -> Result<String, Error> {
match self.node_role(uuid) {
Some(role) => Ok(role.zone.clone()),
_ => Err(Error::Message(
"The Uuid does not correspond to a node present in the cluster.".into(),
)),
}
}
/// Given a node uuids, this function returns its capacity or fails if it does not have any
pub fn get_node_capacity(&self, uuid: &Uuid) -> Result<u64, Error> {
/// Returns the capacity of a node in the layout, if it has one
pub fn get_node_capacity(&self, uuid: &Uuid) -> Option<u64> {
match self.node_role(uuid) {
Some(NodeRole {
capacity: Some(cap),
zone: _,
tags: _,
}) => Ok(*cap),
_ => Err(Error::Message(
"The Uuid does not correspond to a node present in the \
cluster or this node does not have a positive capacity."
.into(),
)),
}) => Some(*cap),
_ => None,
}
}
/// Given a node uuids, this function returns the label of its zone if it has one
pub fn get_node_zone(&self, uuid: &Uuid) -> Option<&str> {
match self.node_role(uuid) {
Some(role) => Some(&role.zone),
_ => None,
}
}
@ -435,17 +97,65 @@ To know the correct value of the new layout version, invoke `garage layout show`
))
}
/// Get the partition in which data would fall on
pub fn partition_of(&self, position: &Hash) -> Partition {
let top = u16::from_be_bytes(position.as_slice()[0..2].try_into().unwrap());
top >> (16 - PARTITION_BITS)
}
/// Get the list of partitions and the first hash of a partition key that would fall in it
pub fn partitions(&self) -> impl Iterator<Item = (Partition, Hash)> + '_ {
(0..(1 << PARTITION_BITS)).map(|i| {
let top = (i as u16) << (16 - PARTITION_BITS);
let mut location = [0u8; 32];
location[..2].copy_from_slice(&u16::to_be_bytes(top)[..]);
(i as u16, Hash::from(location))
})
}
/// Return the n servers in which data for this hash should be replicated
pub fn nodes_of(&self, position: &Hash, n: usize) -> impl Iterator<Item = Uuid> + '_ {
assert_eq!(n, self.replication_factor);
let data = &self.ring_assignment_data;
let partition_nodes = if data.len() == self.replication_factor * (1 << PARTITION_BITS) {
let partition_idx = self.partition_of(position) as usize;
let partition_start = partition_idx * self.replication_factor;
let partition_end = (partition_idx + 1) * self.replication_factor;
&data[partition_start..partition_end]
} else {
warn!("Ring not yet ready, read/writes will be lost!");
&[]
};
partition_nodes
.iter()
.map(move |i| self.node_id_vec[*i as usize])
}
// ===================== internal information extractors ======================
pub(crate) fn expect_get_node_capacity(&self, uuid: &Uuid) -> u64 {
self.get_node_capacity(uuid)
.expect("non-gateway node with zero capacity")
}
pub(crate) fn expect_get_node_zone(&self, uuid: &Uuid) -> &str {
self.get_node_zone(uuid).expect("node without a zone")
}
/// Returns the sum of capacities of non gateway nodes in the cluster
fn get_total_capacity(&self) -> Result<u64, Error> {
fn get_total_capacity(&self) -> u64 {
let mut total_capacity = 0;
for uuid in self.nongateway_nodes().iter() {
total_capacity += self.get_node_capacity(uuid)?;
for uuid in self.nongateway_nodes() {
total_capacity += self.expect_get_node_capacity(uuid);
}
Ok(total_capacity)
total_capacity
}
/// Returns the effective value of the zone_redundancy parameter
fn effective_zone_redundancy(&self) -> usize {
pub(crate) fn effective_zone_redundancy(&self) -> usize {
match self.parameters.zone_redundancy {
ZoneRedundancy::AtLeast(v) => v,
ZoneRedundancy::Maximum => {
@ -465,10 +175,14 @@ To know the correct value of the new layout version, invoke `garage layout show`
/// (assignment, roles, parameters, partition size)
/// returns true if consistent, false if error
pub fn check(&self) -> Result<(), String> {
// Check that the hash of the staging data is correct
let staging_hash = self.calculate_staging_hash();
if staging_hash != self.staging_hash {
return Err("staging_hash is incorrect".into());
// Check that the assignment data has the correct length
let expected_assignment_data_len = (1 << PARTITION_BITS) * self.replication_factor;
if self.ring_assignment_data.len() != expected_assignment_data_len {
return Err(format!(
"ring_assignment_data has incorrect length {} instead of {}",
self.ring_assignment_data.len(),
expected_assignment_data_len
));
}
// Check that node_id_vec contains the correct list of nodes
@ -486,16 +200,6 @@ To know the correct value of the new layout version, invoke `garage layout show`
return Err(format!("node_id_vec does not contain the correct set of nodes\nnode_id_vec: {:?}\nexpected: {:?}", node_id_vec, expected_nodes));
}
// Check that the assignment data has the correct length
let expected_assignment_data_len = (1 << PARTITION_BITS) * self.replication_factor;
if self.ring_assignment_data.len() != expected_assignment_data_len {
return Err(format!(
"ring_assignment_data has incorrect length {} instead of {}",
self.ring_assignment_data.len(),
expected_assignment_data_len
));
}
// Check that the assigned nodes are correct identifiers
// of nodes that are assigned a role
// and that role is not the role of a gateway nodes
@ -524,10 +228,7 @@ To know the correct value of the new layout version, invoke `garage layout show`
// Check that every partition is spread over at least zone_redundancy zones.
let zones_of_p = nodes_of_p
.iter()
.map(|n| {
self.get_node_zone(&self.node_id_vec[*n as usize])
.expect("Zone not found.")
})
.map(|n| self.expect_get_node_zone(&self.node_id_vec[*n as usize]))
.collect::<Vec<_>>();
if zones_of_p.iter().unique().count() < zone_redundancy {
return Err(format!(
@ -546,7 +247,7 @@ To know the correct value of the new layout version, invoke `garage layout show`
if *usage > 0 {
let uuid = self.node_id_vec[n];
let partusage = usage * self.partition_size;
let nodecap = self.get_node_capacity(&uuid).unwrap();
let nodecap = self.expect_get_node_capacity(&uuid);
if partusage > nodecap {
return Err(format!(
"node usage ({}) is bigger than node capacity ({})",
@ -574,12 +275,24 @@ To know the correct value of the new layout version, invoke `garage layout show`
Ok(())
}
}
// ====================================================================================
// ================== updates to layout, internals ===================
pub(crate) fn calculate_next_version(
mut self,
staging: &LayoutStaging,
) -> Result<(Self, Message), Error> {
self.version += 1;
self.roles.merge(&staging.roles);
self.roles.retain(|(_, _, v)| v.0.is_some());
self.parameters = *staging.parameters.get();
let msg = self.calculate_partition_assignment()?;
Ok((self, msg))
}
// Implementation of the ClusterLayout methods related to the assignment algorithm.
impl ClusterLayout {
/// This function calculates a new partition-to-node assignment.
/// The computed assignment respects the node replication factor
/// and the zone redundancy parameter It maximizes the capacity of a
@ -609,12 +322,12 @@ impl ClusterLayout {
// to use them as indices in the flow graphs.
let (id_to_zone, zone_to_id) = self.generate_nongateway_zone_ids()?;
let nb_nongateway_nodes = self.nongateway_nodes().len();
if nb_nongateway_nodes < self.replication_factor {
if self.nongateway_nodes().len() < self.replication_factor {
return Err(Error::Message(format!(
"The number of nodes with positive \
capacity ({}) is smaller than the replication factor ({}).",
nb_nongateway_nodes, self.replication_factor
self.nongateway_nodes().len(),
self.replication_factor
)));
}
if id_to_zone.len() < zone_redundancy {
@ -712,12 +425,14 @@ impl ClusterLayout {
.map(|(k, _, _)| *k)
.collect();
let mut new_node_id_vec = Vec::<Uuid>::new();
new_node_id_vec.extend(new_non_gateway_nodes);
new_node_id_vec.extend(new_gateway_nodes);
let old_node_id_vec = std::mem::take(&mut self.node_id_vec);
let old_node_id_vec = self.node_id_vec.clone();
self.node_id_vec = new_node_id_vec.clone();
self.nongateway_node_count = new_non_gateway_nodes.len();
self.node_id_vec.clear();
self.node_id_vec.extend(new_non_gateway_nodes);
self.node_id_vec.extend(new_gateway_nodes);
let new_node_id_vec = &self.node_id_vec;
// (2) We retrieve the old association
// We rewrite the old association with the new indices. We only consider partition
@ -756,7 +471,7 @@ impl ClusterLayout {
}
}
// We write the ring
// We clear the ring assignemnt data
self.ring_assignment_data = Vec::<CompactNodeType>::new();
Ok(Some(old_assignment))
@ -764,7 +479,9 @@ impl ClusterLayout {
/// This function generates ids for the zone of the nodes appearing in
/// self.node_id_vec.
fn generate_nongateway_zone_ids(&self) -> Result<(Vec<String>, HashMap<String, usize>), Error> {
pub(crate) fn generate_nongateway_zone_ids(
&self,
) -> Result<(Vec<String>, HashMap<String, usize>), Error> {
let mut id_to_zone = Vec::<String>::new();
let mut zone_to_id = HashMap::<String, usize>::new();
@ -797,7 +514,7 @@ impl ClusterLayout {
}
let mut s_down = 1;
let mut s_up = self.get_total_capacity()?;
let mut s_up = self.get_total_capacity();
while s_down + 1 < s_up {
g = self.generate_flow_graph(
(s_down + s_up) / 2,
@ -846,7 +563,7 @@ impl ClusterLayout {
zone_redundancy: usize,
) -> Result<Graph<FlowEdge>, Error> {
let vertices =
ClusterLayout::generate_graph_vertices(zone_to_id.len(), self.nongateway_nodes().len());
LayoutVersion::generate_graph_vertices(zone_to_id.len(), self.nongateway_nodes().len());
let mut g = Graph::<FlowEdge>::new(&vertices);
let nb_zones = zone_to_id.len();
for p in 0..NB_PARTITIONS {
@ -866,8 +583,8 @@ impl ClusterLayout {
}
}
for n in 0..self.nongateway_nodes().len() {
let node_capacity = self.get_node_capacity(&self.node_id_vec[n])?;
let node_zone = zone_to_id[&self.get_node_zone(&self.node_id_vec[n])?];
let node_capacity = self.expect_get_node_capacity(&self.node_id_vec[n]);
let node_zone = zone_to_id[self.expect_get_node_zone(&self.node_id_vec[n])];
g.add_edge(Vertex::N(n), Vertex::Sink, node_capacity / partition_size)?;
for p in 0..NB_PARTITIONS {
if !exclude_assoc.contains(&(p, n)) {
@ -913,7 +630,7 @@ impl ClusterLayout {
// The algorithm is such that it will start with the flow that we just computed
// and find ameliorating paths from that.
for (p, n) in exclude_edge.iter() {
let node_zone = zone_to_id[&self.get_node_zone(&self.node_id_vec[*n])?];
let node_zone = zone_to_id[self.expect_get_node_zone(&self.node_id_vec[*n])];
g.add_edge(Vertex::PZ(*p, node_zone), Vertex::N(*n), 1)?;
}
g.compute_maximal_flow()?;
@ -933,7 +650,7 @@ impl ClusterLayout {
let mut cost = CostFunction::new();
for (p, assoc_p) in prev_assign.iter().enumerate() {
for n in assoc_p.iter() {
let node_zone = zone_to_id[&self.get_node_zone(&self.node_id_vec[*n])?];
let node_zone = zone_to_id[self.expect_get_node_zone(&self.node_id_vec[*n])];
cost.insert((Vertex::PZ(p, node_zone), Vertex::N(*n)), -1);
}
}
@ -988,7 +705,7 @@ impl ClusterLayout {
let mut msg = Message::new();
let used_cap = self.partition_size * NB_PARTITIONS as u64 * self.replication_factor as u64;
let total_cap = self.get_total_capacity()?;
let total_cap = self.get_total_capacity();
let percent_cap = 100.0 * (used_cap as f32) / (total_cap as f32);
msg.push(format!(
"Usable capacity / total cluster capacity: {} / {} ({:.1} %)",
@ -1035,7 +752,7 @@ impl ClusterLayout {
let mut old_zones_of_p = Vec::<usize>::new();
for n in prev_assign[p].iter() {
old_zones_of_p
.push(zone_to_id[&self.get_node_zone(&self.node_id_vec[*n])?]);
.push(zone_to_id[self.expect_get_node_zone(&self.node_id_vec[*n])]);
}
if !old_zones_of_p.contains(&z) {
new_partitions_zone[z] += 1;
@ -1077,7 +794,7 @@ impl ClusterLayout {
for z in 0..id_to_zone.len() {
let mut nodes_of_z = Vec::<usize>::new();
for n in 0..storing_nodes.len() {
if self.get_node_zone(&self.node_id_vec[n])? == id_to_zone[z] {
if self.expect_get_node_zone(&self.node_id_vec[n]) == id_to_zone[z] {
nodes_of_z.push(n);
}
}
@ -1091,13 +808,13 @@ impl ClusterLayout {
let available_cap_z: u64 = self.partition_size * replicated_partitions as u64;
let mut total_cap_z = 0;
for n in nodes_of_z.iter() {
total_cap_z += self.get_node_capacity(&self.node_id_vec[*n])?;
total_cap_z += self.expect_get_node_capacity(&self.node_id_vec[*n]);
}
let percent_cap_z = 100.0 * (available_cap_z as f32) / (total_cap_z as f32);
for n in nodes_of_z.iter() {
let available_cap_n = stored_partitions[*n] as u64 * self.partition_size;
let total_cap_n = self.get_node_capacity(&self.node_id_vec[*n])?;
let total_cap_n = self.expect_get_node_capacity(&self.node_id_vec[*n]);
let tags_n = (self.node_role(&self.node_id_vec[*n]).ok_or("<??>"))?.tags_string();
table.push(format!(
" {:?}\t{}\t{} ({} new)\t{}\t{} ({:.1}%)",
@ -1127,167 +844,3 @@ impl ClusterLayout {
Ok(msg)
}
}
// ====================================================================================
#[cfg(test)]
mod tests {
use super::{Error, *};
use std::cmp::min;
// This function checks that the partition size S computed is at least better than the
// one given by a very naive algorithm. To do so, we try to run the naive algorithm
// assuming a partion size of S+1. If we succed, it means that the optimal assignment
// was not optimal. The naive algorithm is the following :
// - we compute the max number of partitions associated to every node, capped at the
// partition number. It gives the number of tokens of every node.
// - every zone has a number of tokens equal to the sum of the tokens of its nodes.
// - we cycle over the partitions and associate zone tokens while respecting the
// zone redundancy constraint.
// NOTE: the naive algorithm is not optimal. Counter example:
// take nb_partition = 3 ; replication_factor = 5; redundancy = 4;
// number of tokens by zone : (A, 4), (B,1), (C,4), (D, 4), (E, 2)
// With these parameters, the naive algo fails, whereas there is a solution:
// (A,A,C,D,E) , (A,B,C,D,D) (A,C,C,D,E)
fn check_against_naive(cl: &ClusterLayout) -> Result<bool, Error> {
let over_size = cl.partition_size + 1;
let mut zone_token = HashMap::<String, usize>::new();
let (zones, zone_to_id) = cl.generate_nongateway_zone_ids()?;
if zones.is_empty() {
return Ok(false);
}
for z in zones.iter() {
zone_token.insert(z.clone(), 0);
}
for uuid in cl.nongateway_nodes().iter() {
let z = cl.get_node_zone(uuid)?;
let c = cl.get_node_capacity(uuid)?;
zone_token.insert(
z.clone(),
zone_token[&z] + min(NB_PARTITIONS, (c / over_size) as usize),
);
}
// For every partition, we count the number of zone already associated and
// the name of the last zone associated
let mut id_zone_token = vec![0; zones.len()];
for (z, t) in zone_token.iter() {
id_zone_token[zone_to_id[z]] = *t;
}
let mut nb_token = vec![0; NB_PARTITIONS];
let mut last_zone = vec![zones.len(); NB_PARTITIONS];
let mut curr_zone = 0;
let redundancy = cl.effective_zone_redundancy();
for replic in 0..cl.replication_factor {
for p in 0..NB_PARTITIONS {
while id_zone_token[curr_zone] == 0
|| (last_zone[p] == curr_zone
&& redundancy - nb_token[p] <= cl.replication_factor - replic)
{
curr_zone += 1;
if curr_zone >= zones.len() {
return Ok(true);
}
}
id_zone_token[curr_zone] -= 1;
if last_zone[p] != curr_zone {
nb_token[p] += 1;
last_zone[p] = curr_zone;
}
}
}
return Ok(false);
}
fn show_msg(msg: &Message) {
for s in msg.iter() {
println!("{}", s);
}
}
fn update_layout(
cl: &mut ClusterLayout,
node_id_vec: &Vec<u8>,
node_capacity_vec: &Vec<u64>,
node_zone_vec: &Vec<String>,
zone_redundancy: usize,
) {
for i in 0..node_id_vec.len() {
if let Some(x) = FixedBytes32::try_from(&[i as u8; 32]) {
cl.node_id_vec.push(x);
}
let update = cl.staging_roles.update_mutator(
cl.node_id_vec[i],
NodeRoleV(Some(NodeRole {
zone: (node_zone_vec[i].to_string()),
capacity: (Some(node_capacity_vec[i])),
tags: (vec![]),
})),
);
cl.staging_roles.merge(&update);
}
cl.staging_parameters.update(LayoutParameters {
zone_redundancy: ZoneRedundancy::AtLeast(zone_redundancy),
});
cl.staging_hash = cl.calculate_staging_hash();
}
#[test]
fn test_assignment() {
let mut node_id_vec = vec![1, 2, 3];
let mut node_capacity_vec = vec![4000, 1000, 2000];
let mut node_zone_vec = vec!["A", "B", "C"]
.into_iter()
.map(|x| x.to_string())
.collect();
let mut cl = ClusterLayout::new(3);
update_layout(&mut cl, &node_id_vec, &node_capacity_vec, &node_zone_vec, 3);
let v = cl.version;
let (mut cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
show_msg(&msg);
assert_eq!(cl.check(), Ok(()));
assert!(matches!(check_against_naive(&cl), Ok(true)));
node_id_vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9];
node_capacity_vec = vec![4000, 1000, 1000, 3000, 1000, 1000, 2000, 10000, 2000];
node_zone_vec = vec!["A", "B", "C", "C", "C", "B", "G", "H", "I"]
.into_iter()
.map(|x| x.to_string())
.collect();
update_layout(&mut cl, &node_id_vec, &node_capacity_vec, &node_zone_vec, 2);
let v = cl.version;
let (mut cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
show_msg(&msg);
assert_eq!(cl.check(), Ok(()));
assert!(matches!(check_against_naive(&cl), Ok(true)));
node_capacity_vec = vec![4000, 1000, 2000, 7000, 1000, 1000, 2000, 10000, 2000];
update_layout(&mut cl, &node_id_vec, &node_capacity_vec, &node_zone_vec, 3);
let v = cl.version;
let (mut cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
show_msg(&msg);
assert_eq!(cl.check(), Ok(()));
assert!(matches!(check_against_naive(&cl), Ok(true)));
node_capacity_vec = vec![
4000000, 4000000, 2000000, 7000000, 1000000, 9000000, 2000000, 10000, 2000000,
];
update_layout(&mut cl, &node_id_vec, &node_capacity_vec, &node_zone_vec, 1);
let v = cl.version;
let (cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
show_msg(&msg);
assert_eq!(cl.check(), Ok(()));
assert!(matches!(check_against_naive(&cl), Ok(true)));
}
}

2
src/rpc/lib.rs
View file

@ -11,10 +11,8 @@ mod consul;
#[cfg(feature = "kubernetes-discovery")]
mod kubernetes;
pub mod graph_algo;
pub mod layout;
pub mod replication_mode;
pub mod ring;
pub mod system;
pub mod rpc_helper;

7
src/rpc/replication_mode.rs
View file

@ -54,4 +54,11 @@ impl ReplicationMode {
Self::ThreeWayDangerous => 1,
}
}
pub fn is_read_after_write_consistent(&self) -> bool {
match self {
Self::None | Self::TwoWay | Self::ThreeWay => true,
_ => false,
}
}
}

164
src/rpc/ring.rs
View file

@ -1,164 +0,0 @@
//! Module containing types related to computing nodes which should receive a copy of data blocks
//! and metadata
use std::convert::TryInto;
use garage_util::data::*;
use crate::layout::ClusterLayout;
/// A partition id, which is stored on 16 bits
/// i.e. we have up to 2**16 partitions.
/// (in practice we have exactly 2**PARTITION_BITS partitions)
pub type Partition = u16;
// TODO: make this constant parametrizable in the config file
// For deployments with many nodes it might make sense to bump
// it up to 10.
// Maximum value : 16
/// How many bits from the hash are used to make partitions. Higher numbers means more fairness in
/// presence of numerous nodes, but exponentially bigger ring. Max 16
pub const PARTITION_BITS: usize = 8;
const PARTITION_MASK_U16: u16 = ((1 << PARTITION_BITS) - 1) << (16 - PARTITION_BITS);
/// A ring distributing fairly objects to nodes
#[derive(Clone)]
pub struct Ring {
/// The replication factor for this ring
pub replication_factor: usize,
/// The network configuration used to generate this ring
pub layout: ClusterLayout,
// Internal order of nodes used to make a more compact representation of the ring
nodes: Vec<Uuid>,
// The list of entries in the ring
ring: Vec<RingEntry>,
}
// Type to store compactly the id of a node in the system
// Change this to u16 the day we want to have more than 256 nodes in a cluster
pub type CompactNodeType = u8;
pub const MAX_NODE_NUMBER: usize = 256;
// The maximum number of times an object might get replicated
// This must be at least 3 because Garage supports 3-way replication
// Here we use 6 so that the size of a ring entry is 8 bytes
// (2 bytes partition id, 6 bytes node numbers as u8s)
const MAX_REPLICATION: usize = 6;
/// An entry in the ring
#[derive(Clone, Debug)]
struct RingEntry {
// The two first bytes of the first hash that goes in this partition
// (the next bytes are zeroes)
hash_prefix: u16,
// The nodes that store this partition, stored as a list of positions in the `nodes`
// field of the Ring structure
// Only items 0 up to ring.replication_factor - 1 are used, others are zeros
nodes_buf: [CompactNodeType; MAX_REPLICATION],
}
impl Ring {
pub(crate) fn new(layout: ClusterLayout, replication_factor: usize) -> Self {
if replication_factor != layout.replication_factor {
warn!("Could not build ring: replication factor does not match between local configuration and network role assignment.");
return Self::empty(layout, replication_factor);
}
if layout.ring_assignment_data.len() != replication_factor * (1 << PARTITION_BITS) {
warn!("Could not build ring: network role assignment data has invalid length");
return Self::empty(layout, replication_factor);
}
let nodes = layout.node_id_vec.clone();
let ring = (0..(1 << PARTITION_BITS))
.map(|i| {
let top = (i as u16) << (16 - PARTITION_BITS);
let mut nodes_buf = [0u8; MAX_REPLICATION];
nodes_buf[..replication_factor].copy_from_slice(
&layout.ring_assignment_data
[replication_factor * i..replication_factor * (i + 1)],
);
RingEntry {
hash_prefix: top,
nodes_buf,
}
})
.collect::<Vec<_>>();
Self {
replication_factor,
layout,
nodes,
ring,
}
}
fn empty(layout: ClusterLayout, replication_factor: usize) -> Self {
Self {
replication_factor,
layout,
nodes: vec![],
ring: vec![],
}
}
/// Get the partition in which data would fall on
pub fn partition_of(&self, position: &Hash) -> Partition {
let top = u16::from_be_bytes(position.as_slice()[0..2].try_into().unwrap());
top >> (16 - PARTITION_BITS)
}
/// Get the list of partitions and the first hash of a partition key that would fall in it
pub fn partitions(&self) -> Vec<(Partition, Hash)> {
let mut ret = vec![];
for (i, entry) in self.ring.iter().enumerate() {
let mut location = [0u8; 32];
location[..2].copy_from_slice(&u16::to_be_bytes(entry.hash_prefix)[..]);
ret.push((i as u16, location.into()));
}
if !ret.is_empty() {
assert_eq!(ret[0].1, [0u8; 32].into());
}
ret
}
/// Walk the ring to find the n servers in which data should be replicated
pub fn get_nodes(&self, position: &Hash, n: usize) -> Vec<Uuid> {
if self.ring.len() != 1 << PARTITION_BITS {
warn!("Ring not yet ready, read/writes will be lost!");
return vec![];
}
let partition_idx = self.partition_of(position) as usize;
let partition = &self.ring[partition_idx];
let top = u16::from_be_bytes(position.as_slice()[0..2].try_into().unwrap());
// Check that we haven't messed up our partition table, i.e. that this partition
// table entrey indeed corresponds to the item we are storing
assert_eq!(
partition.hash_prefix & PARTITION_MASK_U16,
top & PARTITION_MASK_U16
);
assert!(n <= self.replication_factor);
partition.nodes_buf[..n]
.iter()
.map(|i| self.nodes[*i as usize])
.collect::<Vec<_>>()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_ring_entry_size() {
assert_eq!(std::mem::size_of::<RingEntry>(), 8);
}
}

494
src/rpc/rpc_helper.rs
View file

@ -1,12 +1,12 @@
//! Contain structs related to making RPCs
use std::sync::Arc;
use std::collections::HashMap;
use std::sync::{Arc, RwLock};
use std::time::Duration;
use futures::future::join_all;
use futures::stream::futures_unordered::FuturesUnordered;
use futures::stream::StreamExt;
use tokio::select;
use tokio::sync::watch;
use opentelemetry::KeyValue;
use opentelemetry::{
@ -26,8 +26,8 @@ use garage_util::data::*;
use garage_util::error::Error;
use garage_util::metrics::RecordDuration;
use crate::layout::{LayoutHelper, LayoutHistory};
use crate::metrics::RpcMetrics;
use crate::ring::Ring;
// Default RPC timeout = 5 minutes
const DEFAULT_TIMEOUT: Duration = Duration::from_secs(300);
@ -36,11 +36,11 @@ const DEFAULT_TIMEOUT: Duration = Duration::from_secs(300);
#[derive(Copy, Clone)]
pub struct RequestStrategy {
/// Min number of response to consider the request successful
pub rs_quorum: Option<usize>,
/// Should requests be dropped after enough response are received
pub rs_interrupt_after_quorum: bool,
rs_quorum: Option<usize>,
/// Send all requests at once
rs_send_all_at_once: Option<bool>,
/// Request priority
pub rs_priority: RequestPriority,
rs_priority: RequestPriority,
/// Custom timeout for this request
rs_timeout: Timeout,
}
@ -57,7 +57,7 @@ impl RequestStrategy {
pub fn with_priority(prio: RequestPriority) -> Self {
RequestStrategy {
rs_quorum: None,
rs_interrupt_after_quorum: false,
rs_send_all_at_once: None,
rs_priority: prio,
rs_timeout: Timeout::Default,
}
@ -67,10 +67,9 @@ impl RequestStrategy {
self.rs_quorum = Some(quorum);
self
}
/// Set if requests can be dropped after quorum has been reached
/// In general true for read requests, and false for write
pub fn interrupt_after_quorum(mut self, interrupt: bool) -> Self {
self.rs_interrupt_after_quorum = interrupt;
/// Set quorum to be reached for request
pub fn send_all_at_once(mut self, value: bool) -> Self {
self.rs_send_all_at_once = Some(value);
self
}
/// Deactivate timeout for this request
@ -91,7 +90,7 @@ pub struct RpcHelper(Arc<RpcHelperInner>);
struct RpcHelperInner {
our_node_id: Uuid,
fullmesh: Arc<FullMeshPeeringStrategy>,
ring: watch::Receiver<Arc<Ring>>,
layout: Arc<RwLock<LayoutHelper>>,
metrics: RpcMetrics,
rpc_timeout: Duration,
}
@ -100,7 +99,7 @@ impl RpcHelper {
pub(crate) fn new(
our_node_id: Uuid,
fullmesh: Arc<FullMeshPeeringStrategy>,
ring: watch::Receiver<Arc<Ring>>,
layout: Arc<RwLock<LayoutHelper>>,
rpc_timeout: Option<Duration>,
) -> Self {
let metrics = RpcMetrics::new();
@ -108,7 +107,7 @@ impl RpcHelper {
Self(Arc::new(RpcHelperInner {
our_node_id,
fullmesh,
ring,
layout,
metrics,
rpc_timeout: rpc_timeout.unwrap_or(DEFAULT_TIMEOUT),
}))
@ -130,6 +129,12 @@ impl RpcHelper {
N: IntoReq<M> + Send,
H: StreamingEndpointHandler<M>,
{
let tracer = opentelemetry::global::tracer("garage");
let span_name = format!("RPC [{}] to {:?}", endpoint.path(), to);
let mut span = tracer.start(span_name);
span.set_attribute(KeyValue::new("from", format!("{:?}", self.0.our_node_id)));
span.set_attribute(KeyValue::new("to", format!("{:?}", to)));
let metric_tags = [
KeyValue::new("rpc_endpoint", endpoint.path().to_string()),
KeyValue::new("from", format!("{:?}", self.0.our_node_id)),
@ -141,6 +146,7 @@ impl RpcHelper {
let node_id = to.into();
let rpc_call = endpoint
.call_streaming(&node_id, msg, strat.rs_priority)
.with_context(Context::current_with_span(span))
.record_duration(&self.0.metrics.rpc_duration, &metric_tags);
let timeout = async {
@ -183,12 +189,17 @@ impl RpcHelper {
N: IntoReq<M>,
H: StreamingEndpointHandler<M>,
{
let tracer = opentelemetry::global::tracer("garage");
let span_name = format!("RPC [{}] call_many {} nodes", endpoint.path(), to.len());
let span = tracer.start(span_name);
let msg = msg.into_req().map_err(netapp::error::Error::from)?;
let resps = join_all(
to.iter()
.map(|to| self.call(endpoint, *to, msg.clone(), strat)),
)
.with_context(Context::current_with_span(span))
.await;
Ok(to
.iter()
@ -220,6 +231,22 @@ impl RpcHelper {
/// Make a RPC call to multiple servers, returning either a Vec of responses,
/// or an error if quorum could not be reached due to too many errors
///
/// If RequestStrategy has send_all_at_once set, then all requests will be
/// sent at once, and `try_call_many` will return as soon as a quorum of
/// responses is achieved, dropping and cancelling the remaining requests.
///
/// Otherwise, `quorum` requests will be sent at the same time, and if an
/// error response is received, a new request will be sent to replace it.
/// The ordering of nodes to which requests are sent is determined by
/// the `RpcHelper::request_order` function, which takes into account
/// parameters such as node zones and measured ping values.
///
/// In both cases, the basic contract of this function is that even in the
/// absence of failures, the RPC call might not be driven to completion
/// on all of the specified nodes. It is therefore unfit for broadcast
/// write operations where we expect all nodes to successfully store
/// the written date.
pub async fn try_call_many<M, N, H, S>(
&self,
endpoint: &Arc<Endpoint<M, H>>,
@ -236,31 +263,24 @@ impl RpcHelper {
let quorum = strategy.rs_quorum.unwrap_or(to.len());
let tracer = opentelemetry::global::tracer("garage");
let span_name = if strategy.rs_interrupt_after_quorum {
format!("RPC {} to {} of {}", endpoint.path(), quorum, to.len())
} else {
format!(
"RPC {} to {} (quorum {})",
endpoint.path(),
to.len(),
quorum
)
};
let span_name = format!(
"RPC [{}] try_call_many (quorum {}/{})",
endpoint.path(),
quorum,
to.len()
);
let mut span = tracer.start(span_name);
span.set_attribute(KeyValue::new("from", format!("{:?}", self.0.our_node_id)));
span.set_attribute(KeyValue::new("to", format!("{:?}", to)));
span.set_attribute(KeyValue::new("quorum", quorum as i64));
span.set_attribute(KeyValue::new(
"interrupt_after_quorum",
strategy.rs_interrupt_after_quorum.to_string(),
));
self.try_call_many_internal(endpoint, to, msg, strategy, quorum)
self.try_call_many_inner(endpoint, to, msg, strategy, quorum)
.with_context(Context::current_with_span(span))
.await
}
async fn try_call_many_internal<M, N, H, S>(
async fn try_call_many_inner<M, N, H, S>(
&self,
endpoint: &Arc<Endpoint<M, H>>,
to: &[Uuid],
@ -274,110 +294,63 @@ impl RpcHelper {
H: StreamingEndpointHandler<M> + 'static,
S: Send + 'static,
{
let msg = msg.into_req().map_err(netapp::error::Error::from)?;
// Once quorum is reached, other requests don't matter.
// What we do here is only send the required number of requests
// to reach a quorum, priorizing nodes with the lowest latency.
// When there are errors, we start new requests to compensate.
// TODO: this could be made more aggressive, e.g. if after 2x the
// average ping of a given request, the response is not yet received,
// preemptively send an additional request to any remaining nodes.
// Reorder requests to priorize closeness / low latency
let request_order = self.request_order(&self.0.layout.read().unwrap(), to.iter().copied());
let send_all_at_once = strategy.rs_send_all_at_once.unwrap_or(false);
// Build future for each request
// They are not started now: they are added below in a FuturesUnordered
// object that will take care of polling them (see below)
let requests = to.iter().cloned().map(|to| {
let msg = msg.into_req().map_err(netapp::error::Error::from)?;
let mut requests = request_order.into_iter().map(|to| {
let self2 = self.clone();
let msg = msg.clone();
let endpoint2 = endpoint.clone();
(to, async move {
self2.call(&endpoint2, to, msg, strategy).await
})
async move { self2.call(&endpoint2, to, msg, strategy).await }
});
// Vectors in which success results and errors will be collected
let mut successes = vec![];
let mut errors = vec![];
if strategy.rs_interrupt_after_quorum {
// Case 1: once quorum is reached, other requests don't matter.
// What we do here is only send the required number of requests
// to reach a quorum, priorizing nodes with the lowest latency.
// When there are errors, we start new requests to compensate.
// resp_stream will contain all of the requests that are currently in flight.
// (for the moment none, they will be added in the loop below)
let mut resp_stream = FuturesUnordered::new();
// Reorder requests to priorize closeness / low latency
let request_order = self.request_order(to);
let mut ord_requests = vec![(); request_order.len()]
.into_iter()
.map(|_| None)
.collect::<Vec<_>>();
for (to, fut) in requests {
let i = request_order.iter().position(|x| *x == to).unwrap();
ord_requests[i] = Some((to, fut));
}
// Make an iterator to take requests in their sorted order
let mut requests = ord_requests.into_iter().map(Option::unwrap);
// resp_stream will contain all of the requests that are currently in flight.
// (for the moment none, they will be added in the loop below)
let mut resp_stream = FuturesUnordered::new();
// Do some requests and collect results
'request_loop: while successes.len() < quorum {
// If the current set of requests that are running is not enough to possibly
// reach quorum, start some new requests.
while successes.len() + resp_stream.len() < quorum {
if let Some((req_to, fut)) = requests.next() {
let tracer = opentelemetry::global::tracer("garage");
let span = tracer.start(format!("RPC to {:?}", req_to));
resp_stream.push(tokio::spawn(
fut.with_context(Context::current_with_span(span)),
));
} else {
// If we have no request to add, we know that we won't ever
// reach quorum: bail out now.
break 'request_loop;
}
}
assert!(!resp_stream.is_empty()); // because of loop invariants
// Wait for one request to terminate
match resp_stream.next().await.unwrap().unwrap() {
Ok(msg) => {
successes.push(msg);
}
Err(e) => {
errors.push(e);
}
}
}
} else {
// Case 2: all of the requests need to be sent in all cases,
// and need to terminate. (this is the case for writes that
// must be spread to n nodes)
// Just start all the requests in parallel and return as soon
// as the quorum is reached.
let mut resp_stream = requests
.map(|(_, fut)| fut)
.collect::<FuturesUnordered<_>>();
while let Some(resp) = resp_stream.next().await {
match resp {
Ok(msg) => {
successes.push(msg);
if successes.len() >= quorum {
break;
}
}
Err(e) => {
errors.push(e);
}
// Do some requests and collect results
while successes.len() < quorum {
// If the current set of requests that are running is not enough to possibly
// reach quorum, start some new requests.
while send_all_at_once || successes.len() + resp_stream.len() < quorum {
if let Some(fut) = requests.next() {
resp_stream.push(fut)
} else {
break;
}
}
if !resp_stream.is_empty() {
// Continue remaining requests in background.
// Note: these requests can get interrupted on process shutdown,
// we must not count on them being executed for certain.
// For all background things that have to happen with certainty,
// they have to be put in a proper queue that is persisted to disk.
tokio::spawn(async move {
resp_stream.collect::<Vec<Result<_, _>>>().await;
});
if successes.len() + resp_stream.len() < quorum {
// We know we won't ever reach quorum
break;
}
// Wait for one request to terminate
match resp_stream.next().await.unwrap() {
Ok(msg) => {
successes.push(msg);
}
Err(e) => {
errors.push(e);
}
}
}
@ -385,18 +358,174 @@ impl RpcHelper {
Ok(successes)
} else {
let errors = errors.iter().map(|e| format!("{}", e)).collect::<Vec<_>>();
Err(Error::Quorum(quorum, successes.len(), to.len(), errors))
Err(Error::Quorum(
quorum,
None,
successes.len(),
to.len(),
errors,
))
}
}
pub fn request_order(&self, nodes: &[Uuid]) -> Vec<Uuid> {
/// Make a RPC call to multiple servers, returning either a Vec of responses,
/// or an error if quorum could not be reached due to too many errors
///
/// Contrary to try_call_many, this fuction is especially made for broadcast
/// write operations. In particular:
///
/// - The request are sent to all specified nodes as soon as `try_write_many_sets`
/// is invoked.
///
/// - When `try_write_many_sets` returns, all remaining requests that haven't
/// completed move to a background task so that they have a chance to
/// complete successfully if there are no failures.
///
/// In addition, the nodes to which requests should be sent are divided in
/// "quorum sets", and `try_write_many_sets` only returns once a quorum
/// has been validated in each set. This is used in the case of cluster layout
/// changes, where data has to be written both in the old layout and in the
/// new one as long as all nodes have not successfully tranisitionned and
/// moved all data to the new layout.
pub async fn try_write_many_sets<M, N, H, S>(
&self,
endpoint: &Arc<Endpoint<M, H>>,
to_sets: &[Vec<Uuid>],
msg: N,
strategy: RequestStrategy,
) -> Result<Vec<S>, Error>
where
M: Rpc<Response = Result<S, Error>> + 'static,
N: IntoReq<M>,
H: StreamingEndpointHandler<M> + 'static,
S: Send + 'static,
{
let quorum = strategy
.rs_quorum
.expect("internal error: missing quorum value in try_write_many_sets");
let tracer = opentelemetry::global::tracer("garage");
let span_name = format!(
"RPC [{}] try_write_many_sets (quorum {} in {} sets)",
endpoint.path(),
quorum,
to_sets.len()
);
let mut span = tracer.start(span_name);
span.set_attribute(KeyValue::new("from", format!("{:?}", self.0.our_node_id)));
span.set_attribute(KeyValue::new("to", format!("{:?}", to_sets)));
span.set_attribute(KeyValue::new("quorum", quorum as i64));
self.try_write_many_sets_inner(endpoint, to_sets, msg, strategy, quorum)
.with_context(Context::current_with_span(span))
.await
}
async fn try_write_many_sets_inner<M, N, H, S>(
&self,
endpoint: &Arc<Endpoint<M, H>>,
to_sets: &[Vec<Uuid>],
msg: N,
strategy: RequestStrategy,
quorum: usize,
) -> Result<Vec<S>, Error>
where
M: Rpc<Response = Result<S, Error>> + 'static,
N: IntoReq<M>,
H: StreamingEndpointHandler<M> + 'static,
S: Send + 'static,
{
// Peers may appear in many quorum sets. Here, build a list of peers,
// mapping to the index of the quorum sets in which they appear.
let mut result_tracker = QuorumSetResultTracker::new(to_sets, quorum);
// Send one request to each peer of the quorum sets
let msg = msg.into_req().map_err(netapp::error::Error::from)?;
let requests = result_tracker.nodes.keys().map(|peer| {
let self2 = self.clone();
let msg = msg.clone();
let endpoint2 = endpoint.clone();
let to = *peer;
async move { (to, self2.call(&endpoint2, to, msg, strategy).await) }
});
let mut resp_stream = requests.collect::<FuturesUnordered<_>>();
// Drive requests to completion
while let Some((node, resp)) = resp_stream.next().await {
// Store the response in the correct vector and increment the
// appropriate counters
result_tracker.register_result(node, resp);
// If we have a quorum of ok in all quorum sets, then it's a success!
if result_tracker.all_quorums_ok() {
// Continue all other requets in background
tokio::spawn(async move {
resp_stream.collect::<Vec<(Uuid, Result<_, _>)>>().await;
});
return Ok(result_tracker.success_values());
}
// If there is a quorum set for which too many errors were received,
// we know it's impossible to get a quorum, so return immediately.
if result_tracker.too_many_failures() {
break;
}
}
// At this point, there is no quorum and we know that a quorum
// will never be achieved. Currently, we drop all remaining requests.
// Should we still move them to background so that they can continue
// for non-failed nodes? Not doing so has no impact on correctness,
// but it means that more cancellation messages will be sent. Idk.
// (When an in-progress request future is dropped, Netapp automatically
// sends a cancellation message to the remote node to inform it that
// the result is no longer needed. In turn, if the remote node receives
// the cancellation message in time, it interrupts the task of the
// running request handler.)
// Failure, could not get quorum
Err(result_tracker.quorum_error())
}
// ---- functions not related to MAKING RPCs, but just determining to what nodes
// they should be made and in which order ----
pub fn block_read_nodes_of(&self, position: &Hash, rpc_helper: &RpcHelper) -> Vec<Uuid> {
let layout = self.0.layout.read().unwrap();
let mut ret = Vec::with_capacity(12);
let ver_iter = layout
.versions
.iter()
.rev()
.chain(layout.old_versions.iter().rev());
for ver in ver_iter {
if ver.version > layout.sync_map_min() {
continue;
}
let nodes = ver.nodes_of(position, ver.replication_factor);
for node in rpc_helper.request_order(&layout, nodes) {
if !ret.contains(&node) {
ret.push(node);
}
}
}
ret
}
fn request_order(
&self,
layout: &LayoutHistory,
nodes: impl Iterator<Item = Uuid>,
) -> Vec<Uuid> {
// Retrieve some status variables that we will use to sort requests
let peer_list = self.0.fullmesh.get_peer_list();
let ring: Arc<Ring> = self.0.ring.borrow().clone();
let our_zone = match ring.layout.node_role(&self.0.our_node_id) {
Some(pc) => &pc.zone,
None => "",
};
let our_zone = layout
.current()
.get_node_zone(&self.0.our_node_id)
.unwrap_or("");
// Augment requests with some information used to sort them.
// The tuples are as follows:
@ -405,22 +534,18 @@ impl RpcHelper {
// By sorting this vec, we priorize ourself, then nodes in the same zone,
// and within a same zone we priorize nodes with the lowest latency.
let mut nodes = nodes
.iter()
.map(|to| {
let peer_zone = match ring.layout.node_role(to) {
Some(pc) => &pc.zone,
None => "",
};
let peer_zone = layout.current().get_node_zone(&to).unwrap_or("");
let peer_avg_ping = peer_list
.iter()
.find(|x| x.id.as_ref() == to.as_slice())
.and_then(|pi| pi.avg_ping)
.unwrap_or_else(|| Duration::from_secs(10));
(
*to != self.0.our_node_id,
to != self.0.our_node_id,
peer_zone != our_zone,
peer_avg_ping,
*to,
to,
)
})
.collect::<Vec<_>>();
@ -434,3 +559,108 @@ impl RpcHelper {
.collect::<Vec<_>>()
}
}
// ------- utility for tracking successes/errors among write sets --------
pub struct QuorumSetResultTracker<S, E> {
/// The set of nodes and the index of the quorum sets they belong to
pub nodes: HashMap<Uuid, Vec<usize>>,
/// The quorum value, i.e. number of success responses to await in each set
pub quorum: usize,
/// The success responses received
pub successes: Vec<(Uuid, S)>,
/// The error responses received
pub failures: Vec<(Uuid, E)>,
/// The counters for successes in each set
pub success_counters: Box<[usize]>,
/// The counters for failures in each set
pub failure_counters: Box<[usize]>,
/// The total number of nodes in each set
pub set_lens: Box<[usize]>,
}
impl<S, E> QuorumSetResultTracker<S, E>
where
E: std::fmt::Display,
{
pub fn new<A>(sets: &[A], quorum: usize) -> Self
where
A: AsRef<[Uuid]>,
{
let mut nodes = HashMap::<Uuid, Vec<usize>>::new();
for (i, set) in sets.iter().enumerate() {
for node in set.as_ref().iter() {
nodes.entry(*node).or_default().push(i);
}
}
let num_nodes = nodes.len();
Self {
nodes,
quorum,
successes: Vec::with_capacity(num_nodes),
failures: vec![],
success_counters: vec![0; sets.len()].into_boxed_slice(),
failure_counters: vec![0; sets.len()].into_boxed_slice(),
set_lens: sets
.iter()
.map(|x| x.as_ref().len())
.collect::<Vec<_>>()
.into_boxed_slice(),
}
}
pub fn register_result(&mut self, node: Uuid, result: Result<S, E>) {
match result {
Ok(s) => {
self.successes.push((node, s));
for set in self.nodes.get(&node).unwrap().iter() {
self.success_counters[*set] += 1;
}
}
Err(e) => {
self.failures.push((node, e));
for set in self.nodes.get(&node).unwrap().iter() {
self.failure_counters[*set] += 1;
}
}
}
}
pub fn all_quorums_ok(&self) -> bool {
self.success_counters
.iter()
.all(|ok_cnt| *ok_cnt >= self.quorum)
}
pub fn too_many_failures(&self) -> bool {
self.failure_counters
.iter()
.zip(self.set_lens.iter())
.any(|(err_cnt, set_len)| *err_cnt + self.quorum > *set_len)
}
pub fn success_values(self) -> Vec<S> {
self.successes
.into_iter()
.map(|(_, x)| x)
.collect::<Vec<_>>()
}
pub fn quorum_error(self) -> Error {
let errors = self
.failures
.iter()
.map(|(n, e)| format!("{:?}: {}", n, e))
.collect::<Vec<_>>();
Error::Quorum(
self.quorum,
Some(self.set_lens.len()),
self.successes.len(),
self.nodes.len(),
errors,
)
}
}

429
src/rpc/system.rs
View file

@ -1,10 +1,10 @@
//! Module containing structs related to membership management
use std::collections::HashMap;
use std::collections::{HashMap, HashSet};
use std::io::{Read, Write};
use std::net::{IpAddr, SocketAddr};
use std::path::{Path, PathBuf};
use std::sync::atomic::Ordering;
use std::sync::{Arc, RwLock};
use std::sync::{Arc, RwLock, RwLockReadGuard};
use std::time::{Duration, Instant};
use arc_swap::ArcSwap;
@ -13,8 +13,7 @@ use futures::join;
use serde::{Deserialize, Serialize};
use sodiumoxide::crypto::sign::ed25519;
use tokio::select;
use tokio::sync::watch;
use tokio::sync::Mutex;
use tokio::sync::{watch, Notify};
use netapp::endpoint::{Endpoint, EndpointHandler};
use netapp::message::*;
@ -34,9 +33,10 @@ use garage_util::time::*;
use crate::consul::ConsulDiscovery;
#[cfg(feature = "kubernetes-discovery")]
use crate::kubernetes::*;
use crate::layout::*;
use crate::layout::{
self, manager::LayoutManager, LayoutHelper, LayoutHistory, NodeRoleV, RpcLayoutDigest,
};
use crate::replication_mode::*;
use crate::ring::*;
use crate::rpc_helper::*;
use crate::system_metrics::*;
@ -47,10 +47,10 @@ const STATUS_EXCHANGE_INTERVAL: Duration = Duration::from_secs(10);
/// Version tag used for version check upon Netapp connection.
/// Cluster nodes with different version tags are deemed
/// incompatible and will refuse to connect.
pub const GARAGE_VERSION_TAG: u64 = 0x6761726167650008; // garage 0x0008
pub const GARAGE_VERSION_TAG: u64 = 0x676172616765000A; // garage 0x000A
/// RPC endpoint used for calls related to membership
pub const SYSTEM_RPC_PATH: &str = "garage_rpc/membership.rs/SystemRpc";
pub const SYSTEM_RPC_PATH: &str = "garage_rpc/system.rs/SystemRpc";
/// RPC messages related to membership
#[derive(Debug, Serialize, Deserialize, Clone)]
@ -59,17 +59,22 @@ pub enum SystemRpc {
Ok,
/// Request to connect to a specific node (in <pubkey>@<host>:<port> format)
Connect(String),
/// Ask other node its cluster layout. Answered with AdvertiseClusterLayout
PullClusterLayout,
/// Advertise Garage status. Answered with another AdvertiseStatus.
/// Exchanged with every node on a regular basis.
AdvertiseStatus(NodeStatus),
/// Advertisement of cluster layout. Sent spontanously or in response to PullClusterLayout
AdvertiseClusterLayout(ClusterLayout),
/// Get known nodes states
GetKnownNodes,
/// Return known nodes
ReturnKnownNodes(Vec<KnownNodeInfo>),
/// Ask other node its cluster layout. Answered with AdvertiseClusterLayout
PullClusterLayout,
/// Advertisement of cluster layout. Sent spontanously or in response to PullClusterLayout
AdvertiseClusterLayout(LayoutHistory),
/// Ask other node its cluster layout update trackers.
PullClusterLayoutTrackers,
/// Advertisement of cluster layout update trackers.
AdvertiseClusterLayoutTrackers(layout::UpdateTrackers),
}
impl Rpc for SystemRpc {
@ -85,7 +90,6 @@ pub struct System {
/// The id of this node
pub id: Uuid,
persist_cluster_layout: Persister<ClusterLayout>,
persist_peer_list: Persister<PeerList>,
local_status: ArcSwap<NodeStatus>,
@ -93,9 +97,8 @@ pub struct System {
pub netapp: Arc<NetApp>,
fullmesh: Arc<FullMeshPeeringStrategy>,
pub rpc: RpcHelper,
system_endpoint: Arc<Endpoint<SystemRpc, System>>,
pub(crate) system_endpoint: Arc<Endpoint<SystemRpc, System>>,
rpc_listen_addr: SocketAddr,
#[cfg(any(feature = "consul-discovery", feature = "kubernetes-discovery"))]
@ -107,15 +110,13 @@ pub struct System {
#[cfg(feature = "kubernetes-discovery")]
kubernetes_discovery: Option<KubernetesDiscoveryConfig>,
pub layout_manager: Arc<LayoutManager>,
metrics: SystemMetrics,
replication_mode: ReplicationMode,
replication_factor: usize,
/// The ring
pub ring: watch::Receiver<Arc<Ring>>,
update_ring: Mutex<watch::Sender<Arc<Ring>>>,
/// Path to metadata directory
pub metadata_dir: PathBuf,
/// Path to data directory
@ -125,14 +126,13 @@ pub struct System {
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NodeStatus {
/// Hostname of the node
pub hostname: String,
pub hostname: Option<String>,
/// Replication factor configured on the node
pub replication_factor: usize,
/// Cluster layout version
pub cluster_layout_version: u64,
/// Hash of cluster layout staging data
pub cluster_layout_staging_hash: Hash,
/// Cluster layout digest
pub layout_digest: RpcLayoutDigest,
/// Disk usage on partition containing metadata directory (tuple: `(avail, total)`)
#[serde(default)]
@ -248,8 +248,7 @@ impl System {
replication_mode: ReplicationMode,
config: &Config,
) -> Result<Arc<Self>, Error> {
let replication_factor = replication_mode.replication_factor();
// ---- setup netapp RPC protocol ----
let node_key =
gen_node_key(&config.metadata_dir).expect("Unable to read or generate node ID");
info!(
@ -257,82 +256,40 @@ impl System {
hex::encode(&node_key.public_key()[..8])
);
let persist_cluster_layout: Persister<ClusterLayout> =
Persister::new(&config.metadata_dir, "cluster_layout");
let persist_peer_list = Persister::new(&config.metadata_dir, "peer_list");
let netapp = NetApp::new(GARAGE_VERSION_TAG, network_key, node_key);
let system_endpoint = netapp.endpoint(SYSTEM_RPC_PATH.into());
let cluster_layout = match persist_cluster_layout.load() {
Ok(x) => {
if x.replication_factor != replication_factor {
return Err(Error::Message(format!(
"Prevous cluster layout has replication factor {}, which is different than the one specified in the config file ({}). The previous cluster layout can be purged, if you know what you are doing, simply by deleting the `cluster_layout` file in your metadata directory.",
x.replication_factor,
replication_factor
)));
}
x
}
Err(e) => {
info!(
"No valid previous cluster layout stored ({}), starting fresh.",
e
);
ClusterLayout::new(replication_factor)
}
};
let metrics = SystemMetrics::new(replication_factor);
let mut local_status = NodeStatus::initial(replication_factor, &cluster_layout);
local_status.update_disk_usage(&config.metadata_dir, &config.data_dir, &metrics);
let ring = Ring::new(cluster_layout, replication_factor);
let (update_ring, ring) = watch::channel(Arc::new(ring));
let rpc_public_addr = match &config.rpc_public_addr {
Some(a_str) => {
use std::net::ToSocketAddrs;
match a_str.to_socket_addrs() {
Err(e) => {
error!(
"Cannot resolve rpc_public_addr {} from config file: {}.",
a_str, e
);
None
}
Ok(a) => {
let a = a.collect::<Vec<_>>();
if a.is_empty() {
error!("rpc_public_addr {} resolve to no known IP address", a_str);
}
if a.len() > 1 {
warn!("Multiple possible resolutions for rpc_public_addr: {:?}. Taking the first one.", a);
}
a.into_iter().next()
}
}
}
None => {
let addr =
get_default_ip().map(|ip| SocketAddr::new(ip, config.rpc_bind_addr.port()));
if let Some(a) = addr {
warn!("Using autodetected rpc_public_addr: {}. Consider specifying it explicitly in configuration file if possible.", a);
}
addr
}
};
// ---- setup netapp public listener and full mesh peering strategy ----
let rpc_public_addr = get_rpc_public_addr(config);
if rpc_public_addr.is_none() {
warn!("This Garage node does not know its publicly reachable RPC address, this might hamper intra-cluster communication.");
}
let netapp = NetApp::new(GARAGE_VERSION_TAG, network_key, node_key);
let fullmesh = FullMeshPeeringStrategy::new(netapp.clone(), vec![], rpc_public_addr);
if let Some(ping_timeout) = config.rpc_ping_timeout_msec {
fullmesh.set_ping_timeout_millis(ping_timeout);
}
let system_endpoint = netapp.endpoint(SYSTEM_RPC_PATH.into());
let persist_peer_list = Persister::new(&config.metadata_dir, "peer_list");
// ---- setup cluster layout and layout manager ----
let replication_factor = replication_mode.replication_factor();
let layout_manager = LayoutManager::new(
config,
netapp.id,
system_endpoint.clone(),
fullmesh.clone(),
replication_mode,
)?;
// ---- set up metrics and status exchange ----
let metrics = SystemMetrics::new(replication_factor);
let mut local_status = NodeStatus::initial(replication_factor, &layout_manager);
local_status.update_disk_usage(&config.metadata_dir, &config.data_dir, &metrics);
// ---- if enabled, set up additionnal peer discovery methods ----
#[cfg(feature = "consul-discovery")]
let consul_discovery = match &config.consul_discovery {
Some(cfg) => Some(
@ -351,20 +308,14 @@ impl System {
warn!("Kubernetes discovery is not enabled in this build.");
}
// ---- done ----
let sys = Arc::new(System {
id: netapp.id.into(),
persist_cluster_layout,
persist_peer_list,
local_status: ArcSwap::new(Arc::new(local_status)),
node_status: RwLock::new(HashMap::new()),
netapp: netapp.clone(),
fullmesh: fullmesh.clone(),
rpc: RpcHelper::new(
netapp.id.into(),
fullmesh,
ring.clone(),
config.rpc_timeout_msec.map(Duration::from_millis),
),
fullmesh,
system_endpoint,
replication_mode,
replication_factor,
@ -376,10 +327,9 @@ impl System {
consul_discovery,
#[cfg(feature = "kubernetes-discovery")]
kubernetes_discovery: config.kubernetes_discovery.clone(),
layout_manager,
metrics,
ring,
update_ring: Mutex::new(update_ring),
metadata_dir: config.metadata_dir.clone(),
data_dir: config.data_dir.clone(),
});
@ -399,6 +349,20 @@ impl System {
);
}
// ---- Public utilities / accessors ----
pub fn cluster_layout(&self) -> RwLockReadGuard<'_, LayoutHelper> {
self.layout_manager.layout()
}
pub fn layout_notify(&self) -> Arc<Notify> {
self.layout_manager.change_notify.clone()
}
pub fn rpc_helper(&self) -> &RpcHelper {
&self.layout_manager.rpc_helper
}
// ---- Administrative operations (directly available and
// also available through RPC) ----
@ -425,18 +389,6 @@ impl System {
known_nodes
}
pub fn get_cluster_layout(&self) -> ClusterLayout {
self.ring.borrow().layout.clone()
}
pub async fn update_cluster_layout(
self: &Arc<Self>,
layout: &ClusterLayout,
) -> Result<(), Error> {
self.handle_advertise_cluster_layout(layout).await?;
Ok(())
}
pub async fn connect(&self, node: &str) -> Result<(), Error> {
let (pubkey, addrs) = parse_and_resolve_peer_addr_async(node)
.await
@ -466,47 +418,63 @@ impl System {
}
pub fn health(&self) -> ClusterHealth {
let ring: Arc<_> = self.ring.borrow().clone();
let quorum = self.replication_mode.write_quorum();
let replication_factor = self.replication_factor;
// Gather information about running nodes.
// Technically, `nodes` contains currently running nodes, as well
// as nodes that this Garage process has been connected to at least
// once since it started.
let nodes = self
.get_known_nodes()
.into_iter()
.map(|n| (n.id, n))
.collect::<HashMap<Uuid, _>>();
let connected_nodes = nodes.iter().filter(|(_, n)| n.is_up).count();
let node_up = |x: &Uuid| nodes.get(x).map(|n| n.is_up).unwrap_or(false);
let storage_nodes = ring
.layout
.roles
.items()
.iter()
.filter(|(_, _, v)| matches!(v, NodeRoleV(Some(r)) if r.capacity.is_some()))
.collect::<Vec<_>>();
let storage_nodes_ok = storage_nodes
.iter()
.filter(|(x, _, _)| nodes.get(x).map(|n| n.is_up).unwrap_or(false))
.count();
// Acquire a rwlock read-lock to the current cluster layout
let layout = self.cluster_layout();
let partitions = ring.partitions();
let partitions_n_up = partitions
.iter()
.map(|(_, h)| {
let pn = ring.get_nodes(h, ring.replication_factor);
pn.iter()
.filter(|x| nodes.get(x).map(|n| n.is_up).unwrap_or(false))
.count()
})
.collect::<Vec<usize>>();
let partitions_all_ok = partitions_n_up
.iter()
.filter(|c| **c == replication_factor)
.count();
let partitions_quorum = partitions_n_up.iter().filter(|c| **c >= quorum).count();
// Obtain information about nodes that have a role as storage nodes
// in one of the active layout versions
let mut storage_nodes = HashSet::<Uuid>::with_capacity(16);
for ver in layout.versions.iter() {
storage_nodes.extend(
ver.roles
.items()
.iter()
.filter(|(_, _, v)| matches!(v, NodeRoleV(Some(r)) if r.capacity.is_some()))
.map(|(n, _, _)| *n),
)
}
let storage_nodes_ok = storage_nodes.iter().filter(|x| node_up(x)).count();
// Determine the number of partitions that have:
// - a quorum of up nodes for all write sets (i.e. are available)
// - for which all nodes in all write sets are up (i.e. are fully healthy)
let partitions = layout.current().partitions().collect::<Vec<_>>();
let mut partitions_quorum = 0;
let mut partitions_all_ok = 0;
for (_, hash) in partitions.iter() {
let mut write_sets = layout
.versions
.iter()
.map(|x| x.nodes_of(hash, x.replication_factor));
let has_quorum = write_sets
.clone()
.all(|set| set.filter(|x| node_up(x)).count() >= quorum);
let all_ok = write_sets.all(|mut set| set.all(|x| node_up(&x)));
if has_quorum {
partitions_quorum += 1;
}
if all_ok {
partitions_all_ok += 1;
}
}
// Determine overall cluster status
let status =
if partitions_quorum == partitions.len() && storage_nodes_ok == storage_nodes.len() {
if partitions_all_ok == partitions.len() && storage_nodes_ok == storage_nodes.len() {
ClusterHealthStatus::Healthy
} else if partitions_quorum == partitions.len() {
ClusterHealthStatus::Degraded
@ -546,7 +514,7 @@ impl System {
if let Err(e) = c
.publish_consul_service(
self.netapp.id,
&self.local_status.load_full().hostname,
&self.local_status.load_full().hostname.as_deref().unwrap(),
rpc_public_addr,
)
.await
@ -573,7 +541,7 @@ impl System {
if let Err(e) = publish_kubernetes_node(
k,
self.netapp.id,
&self.local_status.load_full().hostname,
&self.local_status.load_full().hostname.as_deref().unwrap(),
rpc_public_addr,
)
.await
@ -582,22 +550,10 @@ impl System {
}
}
/// Save network configuration to disc
async fn save_cluster_layout(&self) -> Result<(), Error> {
let ring: Arc<Ring> = self.ring.borrow().clone();
self.persist_cluster_layout
.save_async(&ring.layout)
.await
.expect("Cannot save current cluster layout");
Ok(())
}
fn update_local_status(&self) {
let mut new_si: NodeStatus = self.local_status.load().as_ref().clone();
let ring = self.ring.borrow();
new_si.cluster_layout_version = ring.layout.version;
new_si.cluster_layout_staging_hash = ring.layout.staging_hash;
new_si.layout_digest = self.layout_manager.layout().digest();
new_si.update_disk_usage(&self.metadata_dir, &self.data_dir, &self.metrics);
@ -611,11 +567,6 @@ impl System {
Ok(SystemRpc::Ok)
}
fn handle_pull_cluster_layout(&self) -> SystemRpc {
let ring = self.ring.borrow().clone();
SystemRpc::AdvertiseClusterLayout(ring.layout.clone())
}
fn handle_get_known_nodes(&self) -> SystemRpc {
let known_nodes = self.get_known_nodes();
SystemRpc::ReturnKnownNodes(known_nodes)
@ -635,11 +586,8 @@ impl System {
std::process::exit(1);
}
if info.cluster_layout_version > local_info.cluster_layout_version
|| info.cluster_layout_staging_hash != local_info.cluster_layout_staging_hash
{
tokio::spawn(self.clone().pull_cluster_layout(from));
}
self.layout_manager
.handle_advertise_status(from, &info.layout_digest);
self.node_status
.write()
@ -649,57 +597,6 @@ impl System {
Ok(SystemRpc::Ok)
}
async fn handle_advertise_cluster_layout(
self: &Arc<Self>,
adv: &ClusterLayout,
) -> Result<SystemRpc, Error> {
if adv.replication_factor != self.replication_factor {
let msg = format!(
"Received a cluster layout from another node with replication factor {}, which is different from what we have in our configuration ({}). Discarding the cluster layout we received.",
adv.replication_factor,
self.replication_factor
);
error!("{}", msg);
return Err(Error::Message(msg));
}
let update_ring = self.update_ring.lock().await;
let mut layout: ClusterLayout = self.ring.borrow().layout.clone();
let prev_layout_check = layout.check().is_ok();
if layout.merge(adv) {
if prev_layout_check && layout.check().is_err() {
error!("New cluster layout is invalid, discarding.");
return Err(Error::Message(
"New cluster layout is invalid, discarding.".into(),
));
}
let ring = Ring::new(layout.clone(), self.replication_factor);
update_ring.send(Arc::new(ring))?;
drop(update_ring);
let self2 = self.clone();
tokio::spawn(async move {
if let Err(e) = self2
.rpc
.broadcast(
&self2.system_endpoint,
SystemRpc::AdvertiseClusterLayout(layout),
RequestStrategy::with_priority(PRIO_HIGH),
)
.await
{
warn!("Error while broadcasting new cluster layout: {}", e);
}
});
self.save_cluster_layout().await?;
}
Ok(SystemRpc::Ok)
}
async fn status_exchange_loop(&self, mut stop_signal: watch::Receiver<bool>) {
while !*stop_signal.borrow() {
let restart_at = Instant::now() + STATUS_EXCHANGE_INTERVAL;
@ -707,7 +604,7 @@ impl System {
self.update_local_status();
let local_status: NodeStatus = self.local_status.load().as_ref().clone();
let _ = self
.rpc
.rpc_helper()
.broadcast(
&self.system_endpoint,
SystemRpc::AdvertiseStatus(local_status),
@ -725,9 +622,9 @@ impl System {
async fn discovery_loop(self: &Arc<Self>, mut stop_signal: watch::Receiver<bool>) {
while !*stop_signal.borrow() {
let not_configured = self.ring.borrow().layout.check().is_err();
let not_configured = self.cluster_layout().check().is_err();
let no_peers = self.fullmesh.get_peer_list().len() < self.replication_factor;
let expected_n_nodes = self.ring.borrow().layout.num_nodes();
let expected_n_nodes = self.cluster_layout().all_nodes().len();
let bad_peers = self
.fullmesh
.get_peer_list()
@ -832,48 +729,49 @@ impl System {
.save_async(&PeerList(peer_list))
.await
}
async fn pull_cluster_layout(self: Arc<Self>, peer: Uuid) {
let resp = self
.rpc
.call(
&self.system_endpoint,
peer,
SystemRpc::PullClusterLayout,
RequestStrategy::with_priority(PRIO_HIGH),
)
.await;
if let Ok(SystemRpc::AdvertiseClusterLayout(layout)) = resp {
let _: Result<_, _> = self.handle_advertise_cluster_layout(&layout).await;
}
}
}
#[async_trait]
impl EndpointHandler<SystemRpc> for System {
async fn handle(self: &Arc<Self>, msg: &SystemRpc, from: NodeID) -> Result<SystemRpc, Error> {
match msg {
// ---- system functions -> System ----
SystemRpc::Connect(node) => self.handle_connect(node).await,
SystemRpc::PullClusterLayout => Ok(self.handle_pull_cluster_layout()),
SystemRpc::AdvertiseStatus(adv) => self.handle_advertise_status(from.into(), adv).await,
SystemRpc::AdvertiseClusterLayout(adv) => {
self.clone().handle_advertise_cluster_layout(adv).await
}
SystemRpc::GetKnownNodes => Ok(self.handle_get_known_nodes()),
// ---- layout functions -> LayoutManager ----
SystemRpc::PullClusterLayout => Ok(self.layout_manager.handle_pull_cluster_layout()),
SystemRpc::AdvertiseClusterLayout(adv) => {
self.layout_manager
.handle_advertise_cluster_layout(adv)
.await
}
SystemRpc::PullClusterLayoutTrackers => {
Ok(self.layout_manager.handle_pull_cluster_layout_trackers())
}
SystemRpc::AdvertiseClusterLayoutTrackers(adv) => {
self.layout_manager
.handle_advertise_cluster_layout_trackers(adv)
.await
}
// ---- other -> Error ----
m => Err(Error::unexpected_rpc_message(m)),
}
}
}
impl NodeStatus {
fn initial(replication_factor: usize, layout: &ClusterLayout) -> Self {
fn initial(replication_factor: usize, layout_manager: &LayoutManager) -> Self {
NodeStatus {
hostname: gethostname::gethostname()
.into_string()
.unwrap_or_else(|_| "<invalid utf-8>".to_string()),
hostname: Some(
gethostname::gethostname()
.into_string()
.unwrap_or_else(|_| "<invalid utf-8>".to_string()),
),
replication_factor,
cluster_layout_version: layout.version,
cluster_layout_staging_hash: layout.staging_hash,
layout_digest: layout_manager.layout().digest(),
meta_disk_avail: None,
data_disk_avail: None,
}
@ -881,10 +779,9 @@ impl NodeStatus {
fn unknown() -> Self {
NodeStatus {
hostname: "?".to_string(),
hostname: None,
replication_factor: 0,
cluster_layout_version: 0,
cluster_layout_staging_hash: Hash::from([0u8; 32]),
layout_digest: Default::default(),
meta_disk_avail: None,
data_disk_avail: None,
}
@ -963,6 +860,40 @@ fn get_default_ip() -> Option<IpAddr> {
.map(|a| a.ip())
}
fn get_rpc_public_addr(config: &Config) -> Option<SocketAddr> {
match &config.rpc_public_addr {
Some(a_str) => {
use std::net::ToSocketAddrs;
match a_str.to_socket_addrs() {
Err(e) => {
error!(
"Cannot resolve rpc_public_addr {} from config file: {}.",
a_str, e
);
None
}
Ok(a) => {
let a = a.collect::<Vec<_>>();
if a.is_empty() {
error!("rpc_public_addr {} resolve to no known IP address", a_str);
}
if a.len() > 1 {
warn!("Multiple possible resolutions for rpc_public_addr: {:?}. Taking the first one.", a);
}
a.into_iter().next()
}
}
}
None => {
let addr = get_default_ip().map(|ip| SocketAddr::new(ip, config.rpc_bind_addr.port()));
if let Some(a) = addr {
warn!("Using autodetected rpc_public_addr: {}. Consider specifying it explicitly in configuration file if possible.", a);
}
addr
}
}
}
async fn resolve_peers(peers: &[String]) -> Vec<(NodeID, SocketAddr)> {
let mut ret = vec![];

3
src/table/data.rs
View file

@ -254,7 +254,8 @@ impl<F: TableSchema, R: TableReplication> TableData<F, R> {
// of the GC algorithm, as in all cases GC is suspended if
// any node of the partition is unavailable.
let pk_hash = Hash::try_from(&tree_key[..32]).unwrap();
let nodes = self.replication.write_nodes(&pk_hash);
// TODO: this probably breaks when the layout changes
let nodes = self.replication.storage_nodes(&pk_hash);
if nodes.first() == Some(&self.system.id) {
GcTodoEntry::new(tree_key, new_bytes_hash).save(&self.gc_todo)?;
}

10
src/table/gc.rs
View file

@ -152,7 +152,7 @@ impl<F: TableSchema, R: TableReplication> TableGc<F, R> {
let mut partitions = HashMap::new();
for entry in entries {
let pkh = Hash::try_from(&entry.key[..32]).unwrap();
let mut nodes = self.data.replication.write_nodes(&pkh);
let mut nodes = self.data.replication.storage_nodes(&pkh);
nodes.retain(|x| *x != self.system.id);
nodes.sort();
@ -227,10 +227,10 @@ impl<F: TableSchema, R: TableReplication> TableGc<F, R> {
// GC'ing is not a critical function of the system, so it's not a big
// deal if we can't do it right now.
self.system
.rpc
.rpc_helper()
.try_call_many(
&self.endpoint,
&nodes[..],
&nodes,
GcRpc::Update(updates),
RequestStrategy::with_priority(PRIO_BACKGROUND).with_quorum(nodes.len()),
)
@ -248,10 +248,10 @@ impl<F: TableSchema, R: TableReplication> TableGc<F, R> {
// it means that the garbage collection wasn't completed and has
// to be retried later.
self.system
.rpc
.rpc_helper()
.try_call_many(
&self.endpoint,
&nodes[..],
&nodes,
GcRpc::DeleteIfEqualHash(deletes),
RequestStrategy::with_priority(PRIO_BACKGROUND).with_quorum(nodes.len()),
)

2
src/table/merkle.rs
View file

@ -13,7 +13,7 @@ use garage_util::data::*;
use garage_util::encode::{nonversioned_decode, nonversioned_encode};
use garage_util::error::Error;
use garage_rpc::ring::*;
use garage_rpc::layout::*;
use crate::data::*;
use crate::replication::*;

40
src/table/replication/fullcopy.rs
View file

@ -1,15 +1,22 @@
use std::sync::Arc;
use garage_rpc::ring::*;
use garage_rpc::layout::*;
use garage_rpc::system::System;
use garage_util::data::*;
use crate::replication::*;
// TODO: find a way to track layout changes for this as well
// The hard thing is that this data is stored also on gateway nodes,
// whereas sharded data is stored only on non-Gateway nodes (storage nodes)
// Also we want to be more tolerant to failures of gateways so we don't
// want to do too much holding back of data when progress of gateway
// nodes is not reported in the layout history's ack/sync/sync_ack maps.
/// Full replication schema: all nodes store everything
/// Writes are disseminated in an epidemic manner in the network
/// Advantage: do all reads locally, extremely fast
/// Inconvenient: only suitable to reasonably small tables
/// Inconvenient: if some writes fail, nodes will read outdated data
#[derive(Clone)]
pub struct TableFullReplication {
/// The membership manager of this node
@ -19,6 +26,13 @@ pub struct TableFullReplication {
}
impl TableReplication for TableFullReplication {
type WriteSets = Vec<Vec<Uuid>>;
fn storage_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
let layout = self.system.cluster_layout();
layout.current().all_nodes().to_vec()
}
fn read_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
vec![self.system.id]
}
@ -26,12 +40,11 @@ impl TableReplication for TableFullReplication {
1
}
fn write_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
let ring = self.system.ring.borrow();
ring.layout.node_ids().to_vec()
fn write_sets(&self, hash: &Hash) -> Self::WriteSets {
vec![self.storage_nodes(hash)]
}
fn write_quorum(&self) -> usize {
let nmembers = self.system.ring.borrow().layout.node_ids().len();
let nmembers = self.system.cluster_layout().current().all_nodes().len();
if nmembers > self.max_faults {
nmembers - self.max_faults
} else {
@ -45,7 +58,18 @@ impl TableReplication for TableFullReplication {
fn partition_of(&self, _hash: &Hash) -> Partition {
0u16
}
fn partitions(&self) -> Vec<(Partition, Hash)> {
vec![(0u16, [0u8; 32].into())]
fn sync_partitions(&self) -> SyncPartitions {
let layout = self.system.cluster_layout();
let layout_version = layout.current().version;
SyncPartitions {
layout_version,
partitions: vec![SyncPartition {
partition: 0u16,
first_hash: [0u8; 32].into(),
last_hash: [0xff; 32].into(),
storage_sets: vec![layout.current().all_nodes().to_vec()],
}],
}
}
}

29
src/table/replication/parameters.rs
View file

@ -1,25 +1,44 @@
use garage_rpc::ring::*;
use garage_rpc::layout::*;
use garage_util::data::*;
/// Trait to describe how a table shall be replicated
pub trait TableReplication: Send + Sync + 'static {
type WriteSets: AsRef<Vec<Vec<Uuid>>> + AsMut<Vec<Vec<Uuid>>> + Send + Sync + 'static;
// See examples in table_sharded.rs and table_fullcopy.rs
// To understand various replication methods
/// The entire list of all nodes that store a partition
fn storage_nodes(&self, hash: &Hash) -> Vec<Uuid>;
/// Which nodes to send read requests to
fn read_nodes(&self, hash: &Hash) -> Vec<Uuid>;
/// Responses needed to consider a read succesfull
fn read_quorum(&self) -> usize;
/// Which nodes to send writes to
fn write_nodes(&self, hash: &Hash) -> Vec<Uuid>;
/// Responses needed to consider a write succesfull
fn write_sets(&self, hash: &Hash) -> Self::WriteSets;
/// Responses needed to consider a write succesfull in each set
fn write_quorum(&self) -> usize;
fn max_write_errors(&self) -> usize;
// Accessing partitions, for Merkle tree & sync
/// Get partition for data with given hash
fn partition_of(&self, hash: &Hash) -> Partition;
/// List of existing partitions
fn partitions(&self) -> Vec<(Partition, Hash)>;
/// List of partitions and nodes to sync with in current layout
fn sync_partitions(&self) -> SyncPartitions;
}
#[derive(Debug)]
pub struct SyncPartitions {
pub layout_version: u64,
pub partitions: Vec<SyncPartition>,
}
#[derive(Debug)]
pub struct SyncPartition {
pub partition: Partition,
pub first_hash: Hash,
pub last_hash: Hash,
pub storage_sets: Vec<Vec<Uuid>>,
}

51
src/table/replication/sharded.rs
View file

@ -1,6 +1,6 @@
use std::sync::Arc;
use garage_rpc::ring::*;
use garage_rpc::layout::*;
use garage_rpc::system::System;
use garage_util::data::*;
@ -25,17 +25,21 @@ pub struct TableShardedReplication {
}
impl TableReplication for TableShardedReplication {
type WriteSets = WriteLock<Vec<Vec<Uuid>>>;
fn storage_nodes(&self, hash: &Hash) -> Vec<Uuid> {
self.system.cluster_layout().storage_nodes_of(hash)
}
fn read_nodes(&self, hash: &Hash) -> Vec<Uuid> {
let ring = self.system.ring.borrow();
ring.get_nodes(hash, self.replication_factor)
self.system.cluster_layout().read_nodes_of(hash)
}
fn read_quorum(&self) -> usize {
self.read_quorum
}
fn write_nodes(&self, hash: &Hash) -> Vec<Uuid> {
let ring = self.system.ring.borrow();
ring.get_nodes(hash, self.replication_factor)
fn write_sets(&self, hash: &Hash) -> Self::WriteSets {
self.system.layout_manager.write_sets_of(hash)
}
fn write_quorum(&self) -> usize {
self.write_quorum
@ -45,9 +49,38 @@ impl TableReplication for TableShardedReplication {
}
fn partition_of(&self, hash: &Hash) -> Partition {
self.system.ring.borrow().partition_of(hash)
self.system.cluster_layout().current().partition_of(hash)
}
fn partitions(&self) -> Vec<(Partition, Hash)> {
self.system.ring.borrow().partitions()
fn sync_partitions(&self) -> SyncPartitions {
let layout = self.system.cluster_layout();
let layout_version = layout.ack_map_min();
let mut partitions = layout
.current()
.partitions()
.map(|(partition, first_hash)| {
let storage_sets = layout.storage_sets_of(&first_hash);
SyncPartition {
partition,
first_hash,
last_hash: [0u8; 32].into(), // filled in just after
storage_sets,
}
})
.collect::<Vec<_>>();
for i in 0..partitions.len() {
partitions[i].last_hash = if i + 1 < partitions.len() {
partitions[i + 1].first_hash
} else {
[0xFFu8; 32].into()
};
}
SyncPartitions {
layout_version,
partitions,
}
}
}

249
src/table/sync.rs
View file

@ -6,18 +6,19 @@ use arc_swap::ArcSwapOption;
use async_trait::async_trait;
use futures_util::stream::*;
use opentelemetry::KeyValue;
use rand::Rng;
use rand::prelude::*;
use serde::{Deserialize, Serialize};
use serde_bytes::ByteBuf;
use tokio::select;
use tokio::sync::{mpsc, watch};
use tokio::sync::{mpsc, watch, Notify};
use garage_util::background::*;
use garage_util::data::*;
use garage_util::encode::{debug_serialize, nonversioned_encode};
use garage_util::error::{Error, OkOrMessage};
use garage_rpc::ring::*;
use garage_rpc::layout::*;
use garage_rpc::rpc_helper::QuorumSetResultTracker;
use garage_rpc::system::System;
use garage_rpc::*;
@ -52,16 +53,6 @@ impl Rpc for SyncRpc {
type Response = Result<SyncRpc, Error>;
}
#[derive(Debug, Clone)]
struct TodoPartition {
partition: Partition,
begin: Hash,
end: Hash,
// Are we a node that stores this partition or not?
retain: bool,
}
impl<F: TableSchema, R: TableReplication> TableSyncer<F, R> {
pub(crate) fn new(
system: Arc<System>,
@ -91,10 +82,10 @@ impl<F: TableSchema, R: TableReplication> TableSyncer<F, R> {
bg.spawn_worker(SyncWorker {
syncer: self.clone(),
ring_recv: self.system.ring.clone(),
ring: self.system.ring.borrow().clone(),
layout_notify: self.system.layout_notify(),
layout_digest: self.system.cluster_layout().sync_digest(),
add_full_sync_rx,
todo: vec![],
todo: None,
next_full_sync: Instant::now() + Duration::from_secs(20),
});
}
@ -112,53 +103,56 @@ impl<F: TableSchema, R: TableReplication> TableSyncer<F, R> {
async fn sync_partition(
self: &Arc<Self>,
partition: &TodoPartition,
partition: &SyncPartition,
must_exit: &mut watch::Receiver<bool>,
) -> Result<(), Error> {
if partition.retain {
let my_id = self.system.id;
let nodes = self
.data
.replication
.write_nodes(&partition.begin)
.into_iter()
.filter(|node| *node != my_id)
.collect::<Vec<_>>();
let my_id = self.system.id;
let retain = partition.storage_sets.iter().any(|x| x.contains(&my_id));
if retain {
debug!(
"({}) Syncing {:?} with {:?}...",
F::TABLE_NAME,
partition,
nodes
partition.storage_sets
);
let mut sync_futures = nodes
.iter()
let mut result_tracker = QuorumSetResultTracker::new(
&partition.storage_sets,
self.data.replication.write_quorum(),
);
let mut sync_futures = result_tracker
.nodes
.keys()
.copied()
.map(|node| {
self.clone()
.do_sync_with(partition.clone(), *node, must_exit.clone())
let must_exit = must_exit.clone();
async move {
if node == my_id {
(node, Ok(()))
} else {
(node, self.do_sync_with(partition, node, must_exit).await)
}
}
})
.collect::<FuturesUnordered<_>>();
let mut n_errors = 0;
while let Some(r) = sync_futures.next().await {
if let Err(e) = r {
n_errors += 1;
warn!("({}) Sync error: {}", F::TABLE_NAME, e);
while let Some((node, res)) = sync_futures.next().await {
if let Err(e) = &res {
warn!("({}) Sync error with {:?}: {}", F::TABLE_NAME, node, e);
}
result_tracker.register_result(node, res);
}
if n_errors > self.data.replication.max_write_errors() {
return Err(Error::Message(format!(
"Sync failed with too many nodes (should have been: {:?}).",
nodes
)));
if result_tracker.too_many_failures() {
Err(result_tracker.quorum_error())
} else {
Ok(())
}
} else {
self.offload_partition(&partition.begin, &partition.end, must_exit)
.await?;
self.offload_partition(&partition.first_hash, &partition.last_hash, must_exit)
.await
}
Ok(())
}
// Offload partition: this partition is not something we are storing,
@ -188,12 +182,7 @@ impl<F: TableSchema, R: TableReplication> TableSyncer<F, R> {
}
if !items.is_empty() {
let nodes = self
.data
.replication
.write_nodes(begin)
.into_iter()
.collect::<Vec<_>>();
let nodes = self.data.replication.storage_nodes(begin);
if nodes.contains(&self.system.id) {
warn!(
"({}) Interrupting offload as partitions seem to have changed",
@ -217,7 +206,7 @@ impl<F: TableSchema, R: TableReplication> TableSyncer<F, R> {
end,
counter
);
self.offload_items(&items, &nodes[..]).await?;
self.offload_items(&items, &nodes).await?;
} else {
break;
}
@ -244,7 +233,7 @@ impl<F: TableSchema, R: TableReplication> TableSyncer<F, R> {
}
self.system
.rpc
.rpc_helper()
.try_call_many(
&self.endpoint,
nodes,
@ -284,8 +273,8 @@ impl<F: TableSchema, R: TableReplication> TableSyncer<F, R> {
}
async fn do_sync_with(
self: Arc<Self>,
partition: TodoPartition,
self: &Arc<Self>,
partition: &SyncPartition,
who: Uuid,
must_exit: watch::Receiver<bool>,
) -> Result<(), Error> {
@ -305,7 +294,7 @@ impl<F: TableSchema, R: TableReplication> TableSyncer<F, R> {
// If so, do nothing.
let root_resp = self
.system
.rpc
.rpc_helper()
.call(
&self.endpoint,
who,
@ -361,7 +350,7 @@ impl<F: TableSchema, R: TableReplication> TableSyncer<F, R> {
// and compare it with local node
let remote_node = match self
.system
.rpc
.rpc_helper()
.call(
&self.endpoint,
who,
@ -437,7 +426,7 @@ impl<F: TableSchema, R: TableReplication> TableSyncer<F, R> {
let rpc_resp = self
.system
.rpc
.rpc_helper()
.call(
&self.endpoint,
who,
@ -492,75 +481,41 @@ impl<F: TableSchema, R: TableReplication> EndpointHandler<SyncRpc> for TableSync
struct SyncWorker<F: TableSchema, R: TableReplication> {
syncer: Arc<TableSyncer<F, R>>,
ring_recv: watch::Receiver<Arc<Ring>>,
ring: Arc<Ring>,
layout_notify: Arc<Notify>,
layout_digest: SyncLayoutDigest,
add_full_sync_rx: mpsc::UnboundedReceiver<()>,
todo: Vec<TodoPartition>,
next_full_sync: Instant,
todo: Option<SyncPartitions>,
}
impl<F: TableSchema, R: TableReplication> SyncWorker<F, R> {
fn add_full_sync(&mut self) {
let system = &self.syncer.system;
let data = &self.syncer.data;
let my_id = system.id;
self.todo.clear();
let partitions = data.replication.partitions();
for i in 0..partitions.len() {
let begin = partitions[i].1;
let end = if i + 1 < partitions.len() {
partitions[i + 1].1
} else {
[0xFFu8; 32].into()
};
let nodes = data.replication.write_nodes(&begin);
let retain = nodes.contains(&my_id);
if !retain {
// Check if we have some data to send, otherwise skip
match data.store.range(begin..end) {
Ok(mut iter) => {
if iter.next().is_none() {
continue;
}
}
Err(e) => {
warn!("DB error in add_full_sync: {}", e);
continue;
}
}
}
self.todo.push(TodoPartition {
partition: partitions[i].0,
begin,
end,
retain,
});
fn check_add_full_sync(&mut self) {
let layout_digest = self.syncer.system.cluster_layout().sync_digest();
if layout_digest != self.layout_digest {
self.layout_digest = layout_digest;
info!(
"({}) Layout versions changed ({:?}), adding full sync to syncer todo list",
F::TABLE_NAME,
layout_digest,
);
self.add_full_sync();
}
self.next_full_sync = Instant::now() + ANTI_ENTROPY_INTERVAL;
}
fn pop_task(&mut self) -> Option<TodoPartition> {
if self.todo.is_empty() {
return None;
}
fn add_full_sync(&mut self) {
let mut partitions = self.syncer.data.replication.sync_partitions();
info!(
"{}: Adding full sync for ack layout version {}",
F::TABLE_NAME,
partitions.layout_version
);
let i = rand::thread_rng().gen_range(0..self.todo.len());
if i == self.todo.len() - 1 {
self.todo.pop()
} else {
let replacement = self.todo.pop().unwrap();
let ret = std::mem::replace(&mut self.todo[i], replacement);
Some(ret)
}
partitions.partitions.shuffle(&mut thread_rng());
self.todo = Some(partitions);
self.next_full_sync = Instant::now() + ANTI_ENTROPY_INTERVAL;
}
}
@ -572,14 +527,48 @@ impl<F: TableSchema, R: TableReplication> Worker for SyncWorker<F, R> {
fn status(&self) -> WorkerStatus {
WorkerStatus {
queue_length: Some(self.todo.len() as u64),
queue_length: Some(self.todo.as_ref().map(|x| x.partitions.len()).unwrap_or(0) as u64),
..Default::default()
}
}
async fn work(&mut self, must_exit: &mut watch::Receiver<bool>) -> Result<WorkerState, Error> {
if let Some(partition) = self.pop_task() {
self.syncer.sync_partition(&partition, must_exit).await?;
self.check_add_full_sync();
if let Some(todo) = &mut self.todo {
let partition = todo.partitions.pop().unwrap();
// process partition
if let Err(e) = self.syncer.sync_partition(&partition, must_exit).await {
error!(
"{}: Failed to sync partition {:?}: {}",
F::TABLE_NAME,
partition,
e
);
// if error, put partition back at the other side of the queue,
// so that other partitions will be tried in the meantime
todo.partitions.insert(0, partition);
// TODO: returning an error here will cause the background job worker
// to delay this task for some time, but maybe we don't want to
// delay it if there are lots of failures from nodes that are gone
// (we also don't want zero delays as that will cause lots of useless retries)
return Err(e);
}
if todo.partitions.is_empty() {
info!(
"{}: Completed full sync for ack layout version {}",
F::TABLE_NAME,
todo.layout_version
);
self.syncer
.system
.layout_manager
.sync_table_until(F::TABLE_NAME, todo.layout_version);
self.todo = None;
}
Ok(WorkerState::Busy)
} else {
Ok(WorkerState::Idle)
@ -593,22 +582,16 @@ impl<F: TableSchema, R: TableReplication> Worker for SyncWorker<F, R> {
self.add_full_sync();
}
},
_ = self.ring_recv.changed() => {
let new_ring = self.ring_recv.borrow();
if !Arc::ptr_eq(&new_ring, &self.ring) {
self.ring = new_ring.clone();
drop(new_ring);
debug!("({}) Ring changed, adding full sync to syncer todo list", F::TABLE_NAME);
self.add_full_sync();
}
_ = self.layout_notify.notified() => {
self.check_add_full_sync();
},
_ = tokio::time::sleep_until(self.next_full_sync.into()) => {
self.add_full_sync();
}
}
match self.todo.is_empty() {
false => WorkerState::Busy,
true => WorkerState::Idle,
match self.todo.is_some() {
true => WorkerState::Busy,
false => WorkerState::Idle,
}
}
}

159
src/table/table.rs
View file

@ -20,6 +20,7 @@ use garage_util::error::Error;
use garage_util::metrics::RecordDuration;
use garage_util::migrate::Migrate;
use garage_rpc::rpc_helper::QuorumSetResultTracker;
use garage_rpc::system::System;
use garage_rpc::*;
@ -80,6 +81,8 @@ impl<F: TableSchema, R: TableReplication> Table<F, R> {
let syncer = TableSyncer::new(system.clone(), data.clone(), merkle_updater.clone());
let gc = TableGc::new(system.clone(), data.clone());
system.layout_manager.add_table(F::TABLE_NAME);
let table = Arc::new(Self {
system,
data,
@ -117,16 +120,16 @@ impl<F: TableSchema, R: TableReplication> Table<F, R> {
async fn insert_internal(&self, e: &F::E) -> Result<(), Error> {
let hash = e.partition_key().hash();
let who = self.data.replication.write_nodes(&hash);
let who = self.data.replication.write_sets(&hash);
let e_enc = Arc::new(ByteBuf::from(e.encode()?));
let rpc = TableRpc::<F>::Update(vec![e_enc]);
self.system
.rpc
.try_call_many(
.rpc_helper()
.try_write_many_sets(
&self.endpoint,
&who[..],
who.as_ref(),
rpc,
RequestStrategy::with_priority(PRIO_NORMAL)
.with_quorum(self.data.replication.write_quorum()),
@ -141,7 +144,7 @@ impl<F: TableSchema, R: TableReplication> Table<F, R> {
self.data.queue_insert(tx, e)
}
pub async fn insert_many<I, IE>(&self, entries: I) -> Result<(), Error>
pub async fn insert_many<I, IE>(self: &Arc<Self>, entries: I) -> Result<(), Error>
where
I: IntoIterator<Item = IE> + Send + Sync,
IE: Borrow<F::E> + Send + Sync,
@ -159,51 +162,123 @@ impl<F: TableSchema, R: TableReplication> Table<F, R> {
Ok(())
}
async fn insert_many_internal<I, IE>(&self, entries: I) -> Result<(), Error>
async fn insert_many_internal<I, IE>(self: &Arc<Self>, entries: I) -> Result<(), Error>
where
I: IntoIterator<Item = IE> + Send + Sync,
IE: Borrow<F::E> + Send + Sync,
{
let mut call_list: HashMap<_, Vec<_>> = HashMap::new();
// The different items will have to be stored on possibly different nodes.
// We will here batch all items into a single request for each concerned
// node, with all of the entries it must store within that request.
// Each entry has to be saved to a specific list of "write sets", i.e. a set
// of node within wich a quorum must be achieved. In normal operation, there
// is a single write set which corresponds to the quorum in the current
// cluster layout, but when the layout is updated, multiple write sets might
// have to be handled at once. Here, since we are sending many entries, we
// will have to handle many write sets in all cases. The algorihtm is thus
// to send one request to each node with all the items it must save,
// and keep track of the OK responses within each write set: if for all sets
// a quorum of nodes has answered OK, then the insert has succeeded and
// consistency properties (read-after-write) are preserved.
let quorum = self.data.replication.write_quorum();
// Serialize all entries and compute the write sets for each of them.
// In the case of sharded table replication, this also takes an "ack lock"
// to the layout manager to avoid ack'ing newer versions which are not
// taken into account by writes in progress (the ack can happen later, once
// all writes that didn't take the new layout into account are finished).
// These locks are released when entries_vec is dropped, i.e. when this
// function returns.
let mut entries_vec = Vec::new();
for entry in entries.into_iter() {
let entry = entry.borrow();
let hash = entry.partition_key().hash();
let who = self.data.replication.write_nodes(&hash);
let mut write_sets = self.data.replication.write_sets(&hash);
for set in write_sets.as_mut().iter_mut() {
// Sort nodes in each write sets to merge write sets with same
// nodes but in possibly different orders
set.sort();
}
let e_enc = Arc::new(ByteBuf::from(entry.encode()?));
for node in who {
call_list.entry(node).or_default().push(e_enc.clone());
entries_vec.push((write_sets, e_enc));
}
// Compute a deduplicated list of all of the write sets,
// and compute an index from each node to the position of the sets in which
// it takes part, to optimize the detection of a quorum.
let mut write_sets = entries_vec
.iter()
.flat_map(|(wss, _)| wss.as_ref().iter().map(|ws| ws.as_slice()))
.collect::<Vec<&[Uuid]>>();
write_sets.sort();
write_sets.dedup();
let mut result_tracker = QuorumSetResultTracker::new(&write_sets, quorum);
// Build a map of all nodes to the entries that must be sent to that node.
let mut call_list: HashMap<Uuid, Vec<_>> = HashMap::new();
for (write_sets, entry_enc) in entries_vec.iter() {
for write_set in write_sets.as_ref().iter() {
for node in write_set.iter() {
let node_entries = call_list.entry(*node).or_default();
match node_entries.last() {
Some(x) if Arc::ptr_eq(x, entry_enc) => {
// skip if entry already in list to send to this node
// (could happen if node is in several write sets for this entry)
}
_ => {
node_entries.push(entry_enc.clone());
}
}
}
}
}
let call_futures = call_list.drain().map(|(node, entries)| async move {
let rpc = TableRpc::<F>::Update(entries);
let resp = self
.system
.rpc
.call(
&self.endpoint,
node,
rpc,
RequestStrategy::with_priority(PRIO_NORMAL),
)
.await?;
Ok::<_, Error>((node, resp))
// Build futures to actually perform each of the corresponding RPC calls
let call_futures = call_list.into_iter().map(|(node, entries)| {
let this = self.clone();
async move {
let rpc = TableRpc::<F>::Update(entries);
let resp = this
.system
.rpc_helper()
.call(
&this.endpoint,
node,
rpc,
RequestStrategy::with_priority(PRIO_NORMAL).with_quorum(quorum),
)
.await;
(node, resp)
}
});
let mut resps = call_futures.collect::<FuturesUnordered<_>>();
let mut errors = vec![];
while let Some(resp) = resps.next().await {
if let Err(e) = resp {
errors.push(e);
// Run all requests in parallel thanks to FuturesUnordered, and collect results.
let mut resps = call_futures.collect::<FuturesUnordered<_>>();
while let Some((node, resp)) = resps.next().await {
result_tracker.register_result(node, resp.map(|_| ()));
if result_tracker.all_quorums_ok() {
// Success
// Continue all other requests in background
tokio::spawn(async move {
resps.collect::<Vec<(Uuid, Result<_, _>)>>().await;
});
return Ok(());
}
if result_tracker.too_many_failures() {
// Too many errors in this set, we know we won't get a quorum
break;
}
}
if errors.len() > self.data.replication.max_write_errors() {
Err(Error::Message("Too many errors".into()))
} else {
Ok(())
}
// Failure, could not get quorum within at least one set
Err(result_tracker.quorum_error())
}
pub async fn get(
@ -236,14 +311,13 @@ impl<F: TableSchema, R: TableReplication> Table<F, R> {
let rpc = TableRpc::<F>::ReadEntry(partition_key.clone(), sort_key.clone());
let resps = self
.system
.rpc
.rpc_helper()
.try_call_many(
&self.endpoint,
&who[..],
&who,
rpc,
RequestStrategy::with_priority(PRIO_NORMAL)
.with_quorum(self.data.replication.read_quorum())
.interrupt_after_quorum(true),
.with_quorum(self.data.replication.read_quorum()),
)
.await?;
@ -332,14 +406,13 @@ impl<F: TableSchema, R: TableReplication> Table<F, R> {
let resps = self
.system
.rpc
.rpc_helper()
.try_call_many(
&self.endpoint,
&who[..],
&who,
rpc,
RequestStrategy::with_priority(PRIO_NORMAL)
.with_quorum(self.data.replication.read_quorum())
.interrupt_after_quorum(true),
.with_quorum(self.data.replication.read_quorum()),
)
.await?;
@ -411,7 +484,7 @@ impl<F: TableSchema, R: TableReplication> Table<F, R> {
async fn repair_on_read(&self, who: &[Uuid], what: F::E) -> Result<(), Error> {
let what_enc = Arc::new(ByteBuf::from(what.encode()?));
self.system
.rpc
.rpc_helper()
.try_call_many(
&self.endpoint,
who,

7
src/util/error.rs
View file

@ -55,13 +55,14 @@ pub enum Error {
Timeout,
#[error(
display = "Could not reach quorum of {}. {} of {} request succeeded, others returned errors: {:?}",
display = "Could not reach quorum of {} (sets={:?}). {} of {} request succeeded, others returned errors: {:?}",
_0,
_1,
_2,
_3
_3,
_4
)]
Quorum(usize, usize, usize, Vec<String>),
Quorum(usize, Option<usize>, usize, usize, Vec<String>),
#[error(display = "Unexpected RPC message: {}", _0)]
UnexpectedRpcMessage(String),