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app/vmselect/promql: add -search.disableCache flag for disabling response caching

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This may be useful for data back-filling, when the response caching
could interfere badly with newly added data points with timestamps
in the past.
This commit is contained in:
Aliaksandr Valialkin 2019-06-04 17:29:09 +03:00
parent 17f0a53068
commit 53ea90865d
1 changed files with 9 additions and 2 deletions
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11
app/vmselect/promql/rollup_result_cache.go
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@ -2,6 +2,7 @@ package promql
import (
"crypto/rand"
"flag"
"fmt"
"runtime"
"sync"
@ -15,6 +16,8 @@ import (
"github.com/VictoriaMetrics/metrics"
)
var disableCache = flag.Bool("search.disableCache", false, "Whether to disable response caching. This may be useful during data backfilling")
var rollupResultCacheV = &rollupResultCache{
fastcache.New(1024 * 1024), // This is a cache for testing.
}
@ -47,6 +50,10 @@ func InitRollupResultCache(cachePath string) {
} else {
c = fastcache.New(getRollupResultCacheSize())
}
if *disableCache {
c.Reset()
}
stats := &fastcache.Stats{}
var statsLock sync.Mutex
var statsLastUpdate time.Time
@ -119,7 +126,7 @@ func ResetRollupResultCache() {
}
func (rrc *rollupResultCache) Get(funcName string, ec *EvalConfig, me *metricExpr, window int64) (tss []*timeseries, newStart int64) {
if !ec.mayCache() {
if *disableCache || !ec.mayCache() {
return nil, ec.Start
}
@ -190,7 +197,7 @@ func (rrc *rollupResultCache) Get(funcName string, ec *EvalConfig, me *metricExp
}
func (rrc *rollupResultCache) Put(funcName string, ec *EvalConfig, me *metricExpr, window int64, tss []*timeseries) {
if len(tss) == 0 || !ec.mayCache() {
if *disableCache || len(tss) == 0 || !ec.mayCache() {
return
}