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app/vmselect/netstorage: prevent from calling processBlocks callback after the exit from ProcessBlocks function

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This should prevent from panic at multi-level vmselect
when the top-level vmselect is configured with -replicationFactor > 1
This commit is contained in:
Aliaksandr Valialkin 2022-08-08 12:54:55 +03:00
parent aea2bcd495
commit bc254cb497
No known key found for this signature in database
GPG key ID: A72BEC6CD3D0DED1
2 changed files with 21 additions and 27 deletions
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43
app/vmselect/netstorage/netstorage.go
View file

@ -1179,16 +1179,9 @@ func ExportBlocks(qt *querytracer.Tracer, sq *storage.SearchQuery, deadline sear
MinTimestamp: sq.MinTimestamp,
MaxTimestamp: sq.MaxTimestamp,
}
var wg syncwg.WaitGroup
var stopped uint32
var blocksRead uint64
var samples uint64
processBlock := func(mb *storage.MetricBlock) error {
wg.Add(1)
defer wg.Done()
if atomic.LoadUint32(&stopped) != 0 {
return nil
}
mn := metricNamePool.Get().(*storage.MetricName)
if err := mn.Unmarshal(mb.MetricName); err != nil {
return fmt.Errorf("cannot unmarshal metricName: %w", err)
@ -1203,12 +1196,7 @@ func ExportBlocks(qt *querytracer.Tracer, sq *storage.SearchQuery, deadline sear
return nil
}
_, err := ProcessBlocks(qt, true, sq, processBlock, deadline)
// Make sure processBlock isn't called anymore in order to prevent from data races.
atomic.StoreUint32(&stopped, 1)
wg.Wait()
qt.Printf("export blocks=%d, samples=%d", blocksRead, samples)
qt.Printf("export blocks=%d, samples=%d, err=%v", blocksRead, samples, err)
if err != nil {
return fmt.Errorf("error occured during export: %w", err)
}
@ -1288,16 +1276,9 @@ func ProcessSearchQuery(qt *querytracer.Tracer, denyPartialResponse bool, sq *st
tbf: getTmpBlocksFile(),
m: make(map[string][]tmpBlockAddr),
}
var wg syncwg.WaitGroup
var stopped uint32
var blocksRead uint64
var samples uint64
processBlock := func(mb *storage.MetricBlock) error {
wg.Add(1)
defer wg.Done()
if atomic.LoadUint32(&stopped) != 0 {
return nil
}
atomic.AddUint64(&blocksRead, 1)
n := atomic.AddUint64(&samples, uint64(mb.Block.RowsCount()))
if *maxSamplesPerQuery > 0 && n > uint64(*maxSamplesPerQuery) {
@ -1309,11 +1290,6 @@ func ProcessSearchQuery(qt *querytracer.Tracer, denyPartialResponse bool, sq *st
return nil
}
isPartial, err := ProcessBlocks(qt, denyPartialResponse, sq, processBlock, deadline)
// Make sure processBlock isn't called anymore in order to protect from data races.
atomic.StoreUint32(&stopped, 1)
wg.Wait()
if err != nil {
putTmpBlocksFile(tbfw.tbf)
return nil, false, fmt.Errorf("error occured during search: %w", err)
@ -1344,10 +1320,22 @@ func ProcessBlocks(qt *querytracer.Tracer, denyPartialResponse bool, sq *storage
processBlock func(mb *storage.MetricBlock) error, deadline searchutils.Deadline) (bool, error) {
requestData := sq.Marshal(nil)
// Make sure that processBlock is no longer called after the exit from ProcessBlocks() function.
var stopped uint32
var wg syncwg.WaitGroup
f := func(mb *storage.MetricBlock) error {
wg.Add(1)
defer wg.Done()
if atomic.LoadUint32(&stopped) != 0 {
return nil
}
return processBlock(mb)
}
// Send the query to all the storage nodes in parallel.
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, idx int, sn *storageNode) interface{} {
sn.searchRequests.Inc()
err := sn.processSearchQuery(qt, requestData, processBlock, deadline)
err := sn.processSearchQuery(qt, requestData, f, deadline)
if err != nil {
sn.searchErrors.Inc()
err = fmt.Errorf("cannot perform search on vmstorage %s: %w", sn.connPool.Addr(), err)
@ -1360,6 +1348,9 @@ func ProcessBlocks(qt *querytracer.Tracer, denyPartialResponse bool, sq *storage
errP := result.(*error)
return *errP
})
// Make sure that processBlock is no longer called after the exit from ProcessBlocks() function.
atomic.StoreUint32(&stopped, 1)
wg.Wait()
if err != nil {
return isPartial, fmt.Errorf("cannot fetch query results from vmstorage nodes: %w", err)
}

5
docs/CHANGELOG.md
View file

@ -13,7 +13,10 @@ The following tip changes can be tested by building VictoriaMetrics components f
* [How to build vmauth](https://docs.victoriametrics.com/vmauth.html#how-to-build-from-sources)
* [How to build vmctl](https://docs.victoriametrics.com/vmctl.html#how-to-build)
## tip
## v1.79.x long-time support release (LTS)
* BUGFIX: [VictoriaMetrics cluster](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html): fix potential panic in [multi-level cluster setup](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#multi-level-cluster-setup) when top-level `vmselect` is configured with `-replicationFactor` bigger than 1. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2961).
## [v1.79.1](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.79.1)