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Improve table sync

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This commit is contained in:
Alex Auvolat 2020-04-21 16:05:55 +00:00
parent 0226561035
commit 2a84d965ab
2 changed files with 173 additions and 87 deletions
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34
src/admin_rpc.rs
View file

@ -194,6 +194,37 @@ impl AdminRpcHandler {
}
async fn repair_worker(self: Arc<Self>, must_exit: watch::Receiver<bool>) -> Result<(), Error> {
self.garage
.bucket_table
.syncer
.load_full()
.unwrap()
.add_full_scan()
.await;
self.garage
.object_table
.syncer
.load_full()
.unwrap()
.add_full_scan()
.await;
self.garage
.version_table
.syncer
.load_full()
.unwrap()
.add_full_scan()
.await;
self.garage
.block_ref_table
.syncer
.load_full()
.unwrap()
.add_full_scan()
.await;
// TODO: wait for full sync to finish before proceeding to the rest?
self.repair_versions(&must_exit).await?;
self.repair_block_ref(&must_exit).await?;
self.repair_rc(&must_exit).await?;
@ -297,8 +328,9 @@ impl AdminRpcHandler {
Ok(())
}
async fn repair_rc(&self, must_exit: &watch::Receiver<bool>) -> Result<(), Error> {
async fn repair_rc(&self, _must_exit: &watch::Receiver<bool>) -> Result<(), Error> {
// TODO
warn!("repair_rc: not implemented");
Ok(())
}
}

226
src/table_sync.rs
View file

@ -18,14 +18,14 @@ use crate::membership::Ring;
use crate::table::*;
const MAX_DEPTH: usize = 16;
const SCAN_INTERVAL: Duration = Duration::from_secs(60);
const SCAN_INTERVAL: Duration = Duration::from_secs(1800);
const CHECKSUM_CACHE_TIMEOUT: Duration = Duration::from_secs(1800);
const TABLE_SYNC_RPC_TIMEOUT: Duration = Duration::from_secs(10);
const TABLE_SYNC_RPC_TIMEOUT: Duration = Duration::from_secs(30);
pub struct TableSyncer<F: TableSchema, R: TableReplication> {
table: Arc<Table<F, R>>,
todo: Mutex<SyncTodo>,
cache: Vec<Mutex<BTreeMap<SyncRange, RangeChecksum>>>,
cache: Vec<Mutex<BTreeMap<SyncRange, RangeChecksumCache>>>,
}
#[derive(Serialize, Deserialize)]
@ -47,6 +47,15 @@ struct TodoPartition {
retain: bool,
}
// A SyncRange defines a query on the dataset stored by a node, in the following way:
// - all items whose key are >= `begin`
// - stopping at the first item whose key hash has at least `level` leading zero bytes (excluded)
// - except if the first item of the range has such many leading zero bytes
// - and stopping at `end` (excluded) if such an item is not found
// The checksum itself does not store all of the items in the database, only the hashes of the "sub-ranges"
// i.e. of ranges of level `level-1` that cover the same range
// (ranges of level 0 do not exist and their hash is simply the hash of the first item >= begin)
// See RangeChecksum for the struct that stores this information.
#[derive(Hash, PartialEq, Eq, Debug, Clone, Serialize, Deserialize)]
pub struct SyncRange {
begin: Vec<u8>,
@ -61,7 +70,10 @@ impl std::cmp::PartialOrd for SyncRange {
}
impl std::cmp::Ord for SyncRange {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
self.begin.cmp(&other.begin)
self.begin
.cmp(&other.begin)
.then(self.level.cmp(&other.level))
.then(self.end.cmp(&other.end))
}
}
@ -75,6 +87,13 @@ pub struct RangeChecksum {
time: Instant,
}
#[derive(Debug, Clone)]
pub struct RangeChecksumCache {
hash: Option<Hash>, // None if no children
found_limit: Option<Vec<u8>>,
time: Instant,
}
impl<F, R> TableSyncer<F, R>
where
F: TableSchema + 'static,
@ -159,7 +178,7 @@ where
if nothing_to_do_since.map(|t| Instant::now() - t >= SCAN_INTERVAL).unwrap_or(false) {
nothing_to_do_since = None;
debug!("({}) Adding full scan to syncer todo list", self.table.name);
self.todo.lock().await.add_full_scan(&self.table);
self.add_full_scan().await;
}
}
}
@ -167,6 +186,10 @@ where
Ok(())
}
pub async fn add_full_scan(&self) {
self.todo.lock().await.add_full_scan(&self.table);
}
async fn syncer_task(
self: Arc<Self>,
mut must_exit: watch::Receiver<bool>,
@ -273,47 +296,17 @@ where
}
}
Err(Error::Message(format!(
"Unable to compute root checksum (this should never happen"
"Unable to compute root checksum (this should never happen)"
)))
}
fn range_checksum<'a>(
self: &'a Arc<Self>,
range: &'a SyncRange,
must_exit: &'a mut watch::Receiver<bool>,
) -> BoxFuture<'a, Result<RangeChecksum, Error>> {
async move {
let mut cache = self.cache[range.level].lock().await;
if let Some(v) = cache.get(&range) {
if Instant::now() - v.time < CHECKSUM_CACHE_TIMEOUT {
return Ok(v.clone());
}
}
cache.remove(&range);
drop(cache);
let v = self.range_checksum_inner(&range, must_exit).await?;
trace!(
"({}) New checksum calculated for {}-{}/{}, {} children",
self.table.name,
hex::encode(&range.begin[..]),
hex::encode(&range.end[..]),
range.level,
v.children.len()
);
let mut cache = self.cache[range.level].lock().await;
cache.insert(range.clone(), v.clone());
Ok(v)
}
.boxed()
}
async fn range_checksum_inner(
async fn range_checksum(
self: &Arc<Self>,
range: &SyncRange,
must_exit: &mut watch::Receiver<bool>,
) -> Result<RangeChecksum, Error> {
assert!(range.level != 0);
if range.level == 1 {
let mut children = vec![];
for item in self
@ -323,7 +316,10 @@ where
{
let (key, value) = item?;
let key_hash = hash(&key[..]);
if key != range.begin && key_hash.as_slice()[0..range.level].iter().all(|x| *x == 0)
if children.len() > 0
&& key_hash.as_slice()[0..range.level]
.iter()
.all(|x| *x == 0u8)
{
return Ok(RangeChecksum {
bounds: range.clone(),
@ -354,17 +350,18 @@ where
};
let mut time = Instant::now();
while !*must_exit.borrow() {
let sub_ck = self.range_checksum(&sub_range, must_exit).await?;
let sub_ck = self
.range_checksum_cached_hash(&sub_range, must_exit)
.await?;
if sub_ck.children.len() > 0 {
let sub_ck_hash = hash(&rmp_to_vec_all_named(&sub_ck)?[..]);
children.push((sub_range.clone(), sub_ck_hash));
if let Some(hash) = &sub_ck.hash {
children.push((sub_range.clone(), hash.clone()));
if sub_ck.time < time {
time = sub_ck.time;
}
}
if sub_ck.found_limit.is_none() || sub_ck.children.len() == 0 {
if sub_ck.found_limit.is_none() || sub_ck.hash.is_none() {
return Ok(RangeChecksum {
bounds: range.clone(),
children,
@ -377,7 +374,7 @@ where
let actual_limit_hash = hash(&found_limit[..]);
if actual_limit_hash.as_slice()[0..range.level]
.iter()
.all(|x| *x == 0)
.all(|x| *x == 0u8)
{
return Ok(RangeChecksum {
bounds: range.clone(),
@ -393,6 +390,52 @@ where
}
}
fn range_checksum_cached_hash<'a>(
self: &'a Arc<Self>,
range: &'a SyncRange,
must_exit: &'a mut watch::Receiver<bool>,
) -> BoxFuture<'a, Result<RangeChecksumCache, Error>> {
async move {
let mut cache = self.cache[range.level].lock().await;
if let Some(v) = cache.get(&range) {
if Instant::now() - v.time < CHECKSUM_CACHE_TIMEOUT {
return Ok(v.clone());
}
}
cache.remove(&range);
drop(cache);
let v = self.range_checksum(&range, must_exit).await?;
trace!(
"({}) New checksum calculated for {}-{}/{}, {} children",
self.table.name,
hex::encode(&range.begin)
.chars()
.take(16)
.collect::<String>(),
hex::encode(&range.end).chars().take(16).collect::<String>(),
range.level,
v.children.len()
);
let hash = if v.children.len() > 0 {
Some(hash(&rmp_to_vec_all_named(&v)?[..]))
} else {
None
};
let cache_entry = RangeChecksumCache {
hash,
found_limit: v.found_limit,
time: v.time,
};
let mut cache = self.cache[range.level].lock().await;
cache.insert(range.clone(), cache_entry.clone());
Ok(cache_entry)
}
.boxed()
}
async fn do_sync_with(
self: Arc<Self>,
partition: TodoPartition,
@ -423,6 +466,11 @@ where
} else {
todo.push_back(root_ck);
}
} else {
return Err(Error::BadRequest(format!(
"Invalid respone to GetRootChecksumRange RPC: {}",
debug_serialize(root_cks_resp)
)));
}
while !todo.is_empty() && !*must_exit.borrow() {
@ -435,8 +483,8 @@ where
total_children
);
let end = std::cmp::min(16, todo.len());
let step = todo.drain(..end).collect::<Vec<_>>();
let step_size = std::cmp::min(16, todo.len());
let step = todo.drain(..step_size).collect::<Vec<_>>();
let rpc_resp = self
.table
@ -472,10 +520,7 @@ where
self.table.handle_update(diff_items).await?;
}
if items_to_send.len() > 0 {
self.table
.system
.background
.spawn(self.clone().send_items(who.clone(), items_to_send));
self.send_items(who.clone(), items_to_send).await?;
}
} else {
return Err(Error::BadRequest(format!(
@ -487,7 +532,7 @@ where
Ok(())
}
async fn send_items(self: Arc<Self>, who: UUID, item_list: Vec<Vec<u8>>) -> Result<(), Error> {
async fn send_items(&self, who: UUID, item_list: Vec<Vec<u8>>) -> Result<(), Error> {
info!(
"({}) Sending {} items to {:?}",
self.table.name,
@ -542,56 +587,56 @@ where
) -> Result<SyncRPC, Error> {
let mut ret_ranges = vec![];
let mut ret_items = vec![];
for ckr in checksums.iter() {
let our_ckr = self.range_checksum(&ckr.bounds, must_exit).await?;
for (range, hash) in ckr.children.iter() {
// Only consider items that are in the intersection of the two ranges
// (other ranges will be exchanged at some point)
if our_ckr
.found_limit
.as_ref()
.map(|x| range.begin.as_slice() >= x.as_slice())
.unwrap_or(false)
{
break;
}
for their_ckr in checksums.iter() {
let our_ckr = self.range_checksum(&their_ckr.bounds, must_exit).await?;
for (their_range, their_hash) in their_ckr.children.iter() {
let differs = match our_ckr
.children
.binary_search_by(|(our_range, _)| our_range.begin.cmp(&range.begin))
.binary_search_by(|(our_range, _)| our_range.cmp(&their_range))
{
Err(_) => true,
Ok(i) => our_ckr.children[i].1 != *hash,
Err(_) => {
if their_range.level >= 1 {
let cached_hash = self
.range_checksum_cached_hash(&their_range, must_exit)
.await?;
cached_hash.hash.map(|h| h != *their_hash).unwrap_or(true)
} else {
true
}
}
Ok(i) => our_ckr.children[i].1 != *their_hash,
};
if differs {
ret_ranges.push(range.clone());
if retain && range.level == 0 {
if let Some(item_bytes) = self.table.store.get(range.begin.as_slice())? {
ret_ranges.push(their_range.clone());
if retain && their_range.level == 0 {
if let Some(item_bytes) =
self.table.store.get(their_range.begin.as_slice())?
{
ret_items.push(Arc::new(ByteBuf::from(item_bytes.to_vec())));
}
}
}
}
for (range, _hash) in our_ckr.children.iter() {
if ckr
.found_limit
.as_ref()
.map(|x| range.begin.as_slice() >= x.as_slice())
.unwrap_or(false)
{
break;
for (our_range, _hash) in our_ckr.children.iter() {
if let Some(their_found_limit) = &their_ckr.found_limit {
if our_range.begin.as_slice() > their_found_limit.as_slice() {
break;
}
}
let not_present = ckr
let not_present = our_ckr
.children
.binary_search_by(|(their_range, _)| their_range.begin.cmp(&range.begin))
.binary_search_by(|(their_range, _)| their_range.cmp(&our_range))
.is_err();
if not_present {
if range.level > 0 {
ret_ranges.push(range.clone());
if our_range.level > 0 {
ret_ranges.push(our_range.clone());
}
if retain && range.level == 0 {
if let Some(item_bytes) = self.table.store.get(range.begin.as_slice())? {
if retain && our_range.level == 0 {
if let Some(item_bytes) =
self.table.store.get(our_range.begin.as_slice())?
{
ret_items.push(Arc::new(ByteBuf::from(item_bytes.to_vec())));
}
}
@ -673,6 +718,15 @@ impl SyncTodo {
) {
let my_id = table.system.id.clone();
// If it is us who are entering or leaving the system,
// initiate a full sync instead of incremental sync
if old_ring.config.members.contains_key(&my_id)
!= new_ring.config.members.contains_key(&my_id)
{
self.add_full_scan(table);
return;
}
let mut all_points = None
.into_iter()
.chain(table.replication.split_points(old_ring).drain(..))