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deduplicator.go
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/
deduplicator.go
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package streamaggr
import (
"slices"
"sync"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promutils"
"github.com/VictoriaMetrics/metrics"
)
// Deduplicator deduplicates samples per each time series.
type Deduplicator struct {
da *dedupAggr
lc promutils.LabelsCompressor
dropLabels []string
wg sync.WaitGroup
stopCh chan struct{}
ms *metrics.Set
dedupFlushDuration *metrics.Histogram
dedupFlushTimeouts *metrics.Counter
}
// NewDeduplicator returns new deduplicator, which deduplicates samples per each time series.
//
// The de-duplicated samples are passed to pushFunc once per dedupInterval.
//
// An optional dropLabels list may contain label names, which must be dropped before de-duplicating samples.
// Common case is to drop `replica`-like labels from samples received from HA datasources.
//
// MustStop must be called on the returned deduplicator in order to free up occupied resources.
func NewDeduplicator(pushFunc PushFunc, dedupInterval time.Duration, dropLabels []string) *Deduplicator {
d := &Deduplicator{
da: newDedupAggr(),
dropLabels: dropLabels,
stopCh: make(chan struct{}),
ms: metrics.NewSet(),
}
ms := d.ms
_ = ms.NewGauge(`vm_streamaggr_dedup_state_size_bytes`, func() float64 {
return float64(d.da.sizeBytes())
})
_ = ms.NewGauge(`vm_streamaggr_dedup_state_items_count`, func() float64 {
return float64(d.da.itemsCount())
})
_ = ms.NewGauge(`vm_streamaggr_labels_compressor_size_bytes`, func() float64 {
return float64(d.lc.SizeBytes())
})
_ = ms.NewGauge(`vm_streamaggr_labels_compressor_items_count`, func() float64 {
return float64(d.lc.ItemsCount())
})
d.dedupFlushDuration = ms.GetOrCreateHistogram(`vm_streamaggr_dedup_flush_duration_seconds`)
d.dedupFlushTimeouts = ms.GetOrCreateCounter(`vm_streamaggr_dedup_flush_timeouts_total`)
metrics.RegisterSet(ms)
d.wg.Add(1)
go func() {
defer d.wg.Done()
d.runFlusher(pushFunc, dedupInterval)
}()
return d
}
// MustStop stops d.
func (d *Deduplicator) MustStop() {
metrics.UnregisterSet(d.ms)
d.ms = nil
close(d.stopCh)
d.wg.Wait()
}
// Push pushes tss to d.
func (d *Deduplicator) Push(tss []prompbmarshal.TimeSeries) {
ctx := getDeduplicatorPushCtx()
pss := ctx.pss
labels := &ctx.labels
buf := ctx.buf
dropLabels := d.dropLabels
for _, ts := range tss {
if len(dropLabels) > 0 {
labels.Labels = dropSeriesLabels(labels.Labels[:0], ts.Labels, dropLabels)
} else {
labels.Labels = append(labels.Labels[:0], ts.Labels...)
}
if len(labels.Labels) == 0 {
continue
}
labels.Sort()
buf = d.lc.Compress(buf[:0], labels.Labels)
key := bytesutil.InternBytes(buf)
for _, s := range ts.Samples {
pss = append(pss, pushSample{
key: key,
value: s.Value,
timestamp: s.Timestamp,
})
}
}
d.da.pushSamples(pss)
ctx.pss = pss
ctx.buf = buf
putDeduplicatorPushCtx(ctx)
}
func dropSeriesLabels(dst, src []prompbmarshal.Label, labelNames []string) []prompbmarshal.Label {
for _, label := range src {
if !slices.Contains(labelNames, label.Name) {
dst = append(dst, label)
}
}
return dst
}
func (d *Deduplicator) runFlusher(pushFunc PushFunc, dedupInterval time.Duration) {
t := time.NewTicker(dedupInterval)
defer t.Stop()
for {
select {
case <-d.stopCh:
return
case <-t.C:
d.flush(pushFunc, dedupInterval)
}
}
}
func (d *Deduplicator) flush(pushFunc PushFunc, dedupInterval time.Duration) {
startTime := time.Now()
timestamp := startTime.UnixMilli()
d.da.flush(func(pss []pushSample) {
ctx := getDeduplicatorFlushCtx()
tss := ctx.tss
labels := ctx.labels
samples := ctx.samples
for _, ps := range pss {
labelsLen := len(labels)
labels = decompressLabels(labels, &d.lc, ps.key)
samplesLen := len(samples)
samples = append(samples, prompbmarshal.Sample{
Value: ps.value,
Timestamp: timestamp,
})
tss = append(tss, prompbmarshal.TimeSeries{
Labels: labels[labelsLen:],
Samples: samples[samplesLen:],
})
}
pushFunc(tss)
ctx.tss = tss
ctx.labels = labels
ctx.samples = samples
putDeduplicatorFlushCtx(ctx)
}, true)
duration := time.Since(startTime)
d.dedupFlushDuration.Update(duration.Seconds())
if duration > dedupInterval {
d.dedupFlushTimeouts.Inc()
logger.Warnf("deduplication couldn't be finished in the configured dedupInterval=%s; it took %.03fs; "+
"possible solutions: increase dedupInterval; reduce samples' ingestion rate", dedupInterval, duration.Seconds())
}
}
type deduplicatorPushCtx struct {
pss []pushSample
labels promutils.Labels
buf []byte
}
func (ctx *deduplicatorPushCtx) reset() {
clear(ctx.pss)
ctx.pss = ctx.pss[:0]
ctx.labels.Reset()
ctx.buf = ctx.buf[:0]
}
func getDeduplicatorPushCtx() *deduplicatorPushCtx {
v := deduplicatorPushCtxPool.Get()
if v == nil {
return &deduplicatorPushCtx{}
}
return v.(*deduplicatorPushCtx)
}
func putDeduplicatorPushCtx(ctx *deduplicatorPushCtx) {
ctx.reset()
deduplicatorPushCtxPool.Put(ctx)
}
var deduplicatorPushCtxPool sync.Pool
type deduplicatorFlushCtx struct {
tss []prompbmarshal.TimeSeries
labels []prompbmarshal.Label
samples []prompbmarshal.Sample
}
func (ctx *deduplicatorFlushCtx) reset() {
clear(ctx.tss)
ctx.tss = ctx.tss[:0]
clear(ctx.labels)
ctx.labels = ctx.labels[:0]
clear(ctx.samples)
ctx.samples = ctx.samples[:0]
}
func getDeduplicatorFlushCtx() *deduplicatorFlushCtx {
v := deduplicatorFlushCtxPool.Get()
if v == nil {
return &deduplicatorFlushCtx{}
}
return v.(*deduplicatorFlushCtx)
}
func putDeduplicatorFlushCtx(ctx *deduplicatorFlushCtx) {
ctx.reset()
deduplicatorFlushCtxPool.Put(ctx)
}
var deduplicatorFlushCtxPool sync.Pool