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table: take into account multiple write sets in inserts

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Alex Auvolat 2023-11-14 15:40:46 +01:00
parent 3b361d2959
commit 90e1619b1e
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GPG key ID: 0E496D15096376BE
6 changed files with 190 additions and 135 deletions
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7
src/block/manager.rs
View file

@ -354,8 +354,7 @@ impl BlockManager {
/// Send block to nodes that should have it
pub async fn rpc_put_block(&self, hash: Hash, data: Bytes) -> Result<(), Error> {
// TODO: use quorums among latest write set
let who = self.replication.storage_nodes(&hash);
let who = self.replication.write_sets(&hash);
let (header, bytes) = DataBlock::from_buffer(data, self.compression_level)
.await
@ -365,9 +364,9 @@ impl BlockManager {
self.system
.rpc_helper()
.try_call_many(
.try_write_many_sets(
&self.endpoint,
&who[..],
&who,
put_block_rpc,
RequestStrategy::with_priority(PRIO_NORMAL | PRIO_SECONDARY)
.with_quorum(self.replication.write_quorum()),

2
src/block/resync.rs
View file

@ -434,7 +434,7 @@ impl BlockResyncManager {
.rpc_helper()
.try_call_many(
&manager.endpoint,
&need_nodes[..],
&need_nodes,
put_block_message,
RequestStrategy::with_priority(PRIO_BACKGROUND)
.with_quorum(need_nodes.len()),

15
src/model/k2v/rpc.rs
View file

@ -134,16 +134,14 @@ impl K2VRpcHandler {
.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?;
@ -192,9 +190,7 @@ impl K2VRpcHandler {
&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))
@ -223,7 +219,7 @@ impl K2VRpcHandler {
},
sort_key,
};
// TODO figure this out with write sets, does it still work????
// TODO figure this out with write sets, is it still appropriate???
let nodes = self
.item_table
.data
@ -232,7 +228,7 @@ impl K2VRpcHandler {
let rpc = self.system.rpc_helper().try_call_many(
&self.endpoint,
&nodes[..],
&nodes,
K2VRpc::PollItem {
key: poll_key,
causal_context,
@ -240,6 +236,7 @@ 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 =

280
src/rpc/rpc_helper.rs
View file

@ -1,4 +1,5 @@
//! Contain structs related to making RPCs
use std::collections::HashMap;
use std::sync::{Arc, RwLock};
use std::time::Duration;
@ -35,11 +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,
}
@ -56,7 +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,
}
@ -66,10 +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
@ -235,31 +235,19 @@ 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!("Read RPC {} to {} of {}", 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],
@ -273,12 +261,20 @@ 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.
// Reorder requests to priorize closeness / low latency
let request_order = self.request_order(to);
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();
@ -291,92 +287,39 @@ impl RpcHelper {
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((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 {
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().unwrap() {
Ok(msg) => {
successes.push(msg);
}
Err(e) => {
errors.push(e);
}
}
}
@ -432,4 +375,123 @@ impl RpcHelper {
.map(|(_, _, _, to)| to)
.collect::<Vec<_>>()
}
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 quroum in try_write_many_sets");
let tracer = opentelemetry::global::tracer("garage");
let span_name = format!(
"Write RPC {} (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,
{
let msg = msg.into_req().map_err(netapp::error::Error::from)?;
let mut peers = HashMap::<Uuid, Vec<usize>>::new();
for (i, set) in to_sets.iter().enumerate() {
for peer in set.iter() {
peers.entry(*peer).or_default().push(i);
}
}
let requests = peers.iter().map(|(peer, _)| {
let self2 = self.clone();
let msg = msg.clone();
let endpoint2 = endpoint.clone();
let to = *peer;
let tracer = opentelemetry::global::tracer("garage");
let span = tracer.start(format!("RPC to {:?}", to));
let fut = async move { (to, self2.call(&endpoint2, to, msg, strategy).await) };
tokio::spawn(fut.with_context(Context::current_with_span(span)))
});
let mut resp_stream = requests.collect::<FuturesUnordered<_>>();
let mut successes = vec![];
let mut errors = vec![];
let mut set_counters = vec![(0, 0); to_sets.len()];
while !resp_stream.is_empty() {
let (node, resp) = resp_stream.next().await.unwrap().unwrap();
match resp {
Ok(msg) => {
for set in peers.get(&node).unwrap().iter() {
set_counters[*set].0 += 1;
}
successes.push(msg);
}
Err(e) => {
for set in peers.get(&node).unwrap().iter() {
set_counters[*set].1 += 1;
}
errors.push(e);
}
}
if set_counters.iter().all(|x| x.0 > quorum) {
// Success
// Continue all other requets in background
tokio::spawn(async move {
resp_stream.collect::<Vec<Result<_, _>>>().await;
});
return Ok(successes);
}
if set_counters
.iter()
.enumerate()
.any(|(i, x)| x.1 + quorum > to_sets[i].len())
{
// Too many errors in this set, we know we won't get a quorum
break;
}
}
// Failure, could not get quorum
let errors = errors.iter().map(|e| format!("{}", e)).collect::<Vec<_>>();
Err(Error::Quorum(quorum, successes.len(), peers.len(), errors))
}
}

4
src/table/gc.rs
View file

@ -230,7 +230,7 @@ impl<F: TableSchema, R: TableReplication> TableGc<F, R> {
.rpc_helper()
.try_call_many(
&self.endpoint,
&nodes[..],
&nodes,
GcRpc::Update(updates),
RequestStrategy::with_priority(PRIO_BACKGROUND).with_quorum(nodes.len()),
)
@ -251,7 +251,7 @@ impl<F: TableSchema, R: TableReplication> TableGc<F, R> {
.rpc_helper()
.try_call_many(
&self.endpoint,
&nodes[..],
&nodes,
GcRpc::DeleteIfEqualHash(deletes),
RequestStrategy::with_priority(PRIO_BACKGROUND).with_quorum(nodes.len()),
)

17
src/table/table.rs
View file

@ -119,17 +119,16 @@ impl<F: TableSchema, R: TableReplication> Table<F, R> {
async fn insert_internal(&self, e: &F::E) -> Result<(), Error> {
let hash = e.partition_key().hash();
// TODO: use write sets
let who = self.data.replication.storage_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_helper()
.try_call_many(
.try_write_many_sets(
&self.endpoint,
&who[..],
&who,
rpc,
RequestStrategy::with_priority(PRIO_NORMAL)
.with_quorum(self.data.replication.write_quorum()),
@ -243,11 +242,10 @@ impl<F: TableSchema, R: TableReplication> Table<F, R> {
.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?;
@ -339,11 +337,10 @@ impl<F: TableSchema, R: TableReplication> Table<F, R> {
.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?;