github-mirrors/VictoriaMetrics
1
0
Fork 0
mirror of https://github.com/VictoriaMetrics/VictoriaMetrics.git synced 2024-11-21 14:44:00 +00:00
Code Issues Projects Releases Packages Wiki Activity

app/vmselect: log the metric which trigger rollup result cache reset

Browse source 
This should help finding the source of stale metrics
This commit is contained in:
Aliaksandr Valialkin 2021-03-25 21:30:41 +02:00
parent 50f790b5d7
commit aa81039b42
2 changed files with 10 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
app/vmselect/promql/rollup_result_cache.go
View file

@ -29,12 +29,16 @@ var (
// ResetRollupResultCacheIfNeeded resets rollup result cache if mrs contains timestamps outside `now - search.cacheTimestampOffset`.
func ResetRollupResultCacheIfNeeded(mrs []storage.MetricRow) {
checkRollupResultCacheResetOnce.Do(func() {
rollupResultResetMetricRowSample.Store(&storage.MetricRow{})
go checkRollupResultCacheReset()
})
minTimestamp := int64(fasttime.UnixTimestamp()*1000) - cacheTimestampOffset.Milliseconds() + checkRollupResultCacheResetInterval.Milliseconds()
needCacheReset := false
for i := range mrs {
if mrs[i].Timestamp < minTimestamp {
var mr storage.MetricRow
mr.CopyFrom(&mrs[i])
rollupResultResetMetricRowSample.Store(&mr)
needCacheReset = true
break
}
@ -49,6 +53,10 @@ func checkRollupResultCacheReset() {
for {
time.Sleep(checkRollupResultCacheResetInterval)
if atomic.SwapUint32(&needRollupResultCacheReset, 0) > 0 {
mr := rollupResultResetMetricRowSample.Load().(*storage.MetricRow)
d := int64(fasttime.UnixTimestamp()*1000) - mr.Timestamp - cacheTimestampOffset.Milliseconds()
logger.Warnf("resetting rollup result cache because the metric %s has a timestamp older than -search.cacheTimestampOffset=%s by %.3fs",
mr.String(), cacheTimestampOffset, float64(d)/1e3)
ResetRollupResultCache()
}
}
@ -58,6 +66,7 @@ const checkRollupResultCacheResetInterval = 5 * time.Second
var needRollupResultCacheReset uint32
var checkRollupResultCacheResetOnce sync.Once
var rollupResultResetMetricRowSample atomic.Value
var rollupResultCacheV = &rollupResultCache{
c: workingsetcache.New(1024*1024, time.Hour), // This is a cache for testing.

2
lib/storage/storage.go
View file

@ -1272,7 +1272,7 @@ func (mr *MetricRow) String() string {
if err := mn.unmarshalRaw(mr.MetricNameRaw); err == nil {
metricName = mn.String()
}
return fmt.Sprintf("MetricName=%s, Timestamp=%d, Value=%f\n", metricName, mr.Timestamp, mr.Value)
return fmt.Sprintf("%s (Timestamp=%d, Value=%f)", metricName, mr.Timestamp, mr.Value)
}
// Marshal appends marshaled mr to dst and returns the result.