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04981c7a7f
The resetState arg was used only for the BenchmarkAggregatorsFlushInternalSerial benchmark. This benchmark was testing aggregate state flush performance by keeping the same state across flushes. The benhmark didn't reflect the performance and scalability of stream aggregation in production, while it led to non-trivial code changes related to resetState arg handling. So let's drop the benchmark together with all the code related to resetState handling, in order to simplify the code at lib/streamaggr a bit. Thanks to @AndrewChubatiuk for the original idea at https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6314
79 lines
1.7 KiB
Go
79 lines
1.7 KiB
Go
package streamaggr
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import (
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"sync"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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)
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// maxAggrState calculates output=max, e.g. the maximum value over input samples.
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type maxAggrState struct {
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m sync.Map
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}
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type maxStateValue struct {
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mu sync.Mutex
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max float64
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deleted bool
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}
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func newMaxAggrState() *maxAggrState {
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return &maxAggrState{}
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}
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func (as *maxAggrState) pushSamples(samples []pushSample) {
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for i := range samples {
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s := &samples[i]
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outputKey := getOutputKey(s.key)
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again:
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v, ok := as.m.Load(outputKey)
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if !ok {
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// The entry is missing in the map. Try creating it.
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v = &maxStateValue{
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max: s.value,
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}
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outputKey = bytesutil.InternString(outputKey)
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vNew, loaded := as.m.LoadOrStore(outputKey, v)
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if !loaded {
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// The new entry has been successfully created.
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continue
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}
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// Use the entry created by a concurrent goroutine.
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v = vNew
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}
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sv := v.(*maxStateValue)
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sv.mu.Lock()
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deleted := sv.deleted
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if !deleted {
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if s.value > sv.max {
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sv.max = s.value
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}
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}
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sv.mu.Unlock()
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if deleted {
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// The entry has been deleted by the concurrent call to flushState
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// Try obtaining and updating the entry again.
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goto again
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}
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}
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}
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func (as *maxAggrState) flushState(ctx *flushCtx) {
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m := &as.m
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m.Range(func(k, v any) bool {
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// Atomically delete the entry from the map, so new entry is created for the next flush.
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m.Delete(k)
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sv := v.(*maxStateValue)
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sv.mu.Lock()
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max := sv.max
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// Mark the entry as deleted, so it won't be updated anymore by concurrent pushSample() calls.
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sv.deleted = true
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sv.mu.Unlock()
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key := k.(string)
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ctx.appendSeries(key, "max", max)
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return true
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})
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}
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