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lib/storage: properly check for storage/prefetchedMetricIDs cache expiration deadline (#5607)

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Before, this cache was limited only by size.
Cache invalidation by time happens with jitter to prevent thundering herd problem.

Signed-off-by: hagen1778 <roman@victoriametrics.com>
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Roman Khavronenko 2024-01-15 10:03:06 +01:00 committed by Aliaksandr Valialkin
parent f9d1880477
commit 4ad7c34414
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2 changed files with 7 additions and 2 deletions
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1
docs/CHANGELOG.md
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@ -18,6 +18,7 @@ The following tip changes can be tested by building VictoriaMetrics components f
* BUGFIX: `vmstorage`: added missing `-inmemoryDataFlushInterval` command-line flag, which was missing in [VictoriaMetrics cluster](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html) after implementing [this feature](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3337) in [v1.85.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.85.0).
* BUGFIX: [MetricsQL](https://docs.victoriametrics.com/MetricsQL.html): properly handle queries, which wrap [rollup functions](https://docs.victoriametrics.com/MetricsQL.html#rollup-functions) with multiple arguments without explicitly specified lookbehind window in square brackets into [aggregate functions](https://docs.victoriametrics.com/MetricsQL.html#aggregate-functions). For example, `sum(quantile_over_time(0.5, process_resident_memory_bytes))` was resulting to `expecting at least 2 args to ...; got 1 args' error. Thanks to @atykhyy for [the pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5414).
* BUGFIX: [MetricsQL](https://docs.victoriametrics.com/MetricsQL.html): properly return results from [bottomk](https://docs.victoriametrics.com/MetricsQL.html#bottomk) and `bottomk_*()` functions when some of these results contain NaN values. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5506). Thanks to @xiaozongyang for [the fix](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5509).
* BUGFIX: `vmstorage`: properly check for `storage/prefetchedMetricIDs` cache expiration deadline. Before, this cache was limited only by size.
## [v1.87.12](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.87.12)

8
lib/storage/storage.go
View file

@ -30,6 +30,7 @@ import (
"github.com/VictoriaMetrics/VictoriaMetrics/lib/workingsetcache"
"github.com/VictoriaMetrics/fastcache"
"github.com/VictoriaMetrics/metricsql"
"github.com/valyala/fastrand"
)
const (
@ -1256,10 +1257,13 @@ func (s *Storage) prefetchMetricNames(qt *querytracer.Tracer, accountID, project
// Store the pre-fetched metricIDs, so they aren't pre-fetched next time.
s.prefetchedMetricIDsLock.Lock()
var prefetchedMetricIDsNew *uint64set.Set
if fasttime.UnixTimestamp() < atomic.LoadUint64(&s.prefetchedMetricIDsDeadline) {
if fasttime.UnixTimestamp() > atomic.LoadUint64(&s.prefetchedMetricIDsDeadline) {
// Periodically reset the prefetchedMetricIDs in order to limit its size.
prefetchedMetricIDsNew = &uint64set.Set{}
atomic.StoreUint64(&s.prefetchedMetricIDsDeadline, fasttime.UnixTimestamp()+73*60)
deadlineSec := 73 * 60
jitterSec := fastrand.Uint32n(uint32(deadlineSec / 10))
metricIDsDeadline := fasttime.UnixTimestamp() + uint64(deadlineSec) + uint64(jitterSec)
atomic.StoreUint64(&s.prefetchedMetricIDsDeadline, metricIDsDeadline)
} else {
prefetchedMetricIDsNew = prefetchedMetricIDs.Clone()
}