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perf(nhcbparse): unroll recursion (#15776) 

https://github.com/prometheus/prometheus/pull/15467#issuecomment-2563585979

Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>
pull/15467/head
George Krajcsovits 2025-01-02 15:51:52 +01:00 committed by GitHub
parent 1e420ef373
commit cfcb00a716
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1 changed files with 48 additions and 46 deletions
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94
model/textparse/nhcbparse.go
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@ -177,61 +177,63 @@ func (p *NHCBParser) CreatedTimestamp() *int64 {
}
func (p *NHCBParser) Next() (Entry, error) {
if p.state == stateEmitting {
p.state = stateStart
if p.entry == EntrySeries {
isNHCB := p.handleClassicHistogramSeries(p.lset)
if isNHCB && !p.keepClassicHistograms {
// Do not return the classic histogram series if it was converted to NHCB and we are not keeping classic histograms.
return p.Next()
for {
if p.state == stateEmitting {
p.state = stateStart
if p.entry == EntrySeries {
isNHCB := p.handleClassicHistogramSeries(p.lset)
if isNHCB && !p.keepClassicHistograms {
// Do not return the classic histogram series if it was converted to NHCB and we are not keeping classic histograms.
continue
}
}
return p.entry, p.err
}
return p.entry, p.err
}
p.entry, p.err = p.parser.Next()
if p.err != nil {
if errors.Is(p.err, io.EOF) && p.processNHCB() {
return EntryHistogram, nil
}
return EntryInvalid, p.err
}
switch p.entry {
case EntrySeries:
p.bytes, p.ts, p.value = p.parser.Series()
p.metricString = p.parser.Metric(&p.lset)
// Check the label set to see if we can continue or need to emit the NHCB.
var isNHCB bool
if p.compareLabels() {
// Labels differ. Check if we can emit the NHCB.
if p.processNHCB() {
p.entry, p.err = p.parser.Next()
if p.err != nil {
if errors.Is(p.err, io.EOF) && p.processNHCB() {
return EntryHistogram, nil
}
isNHCB = p.handleClassicHistogramSeries(p.lset)
} else {
// Labels are the same. Check if after an exponential histogram.
if p.lastHistogramExponential {
isNHCB = false
} else {
isNHCB = p.handleClassicHistogramSeries(p.lset)
}
return EntryInvalid, p.err
}
if isNHCB && !p.keepClassicHistograms {
// Do not return the classic histogram series if it was converted to NHCB and we are not keeping classic histograms.
return p.Next()
switch p.entry {
case EntrySeries:
p.bytes, p.ts, p.value = p.parser.Series()
p.metricString = p.parser.Metric(&p.lset)
// Check the label set to see if we can continue or need to emit the NHCB.
var isNHCB bool
if p.compareLabels() {
// Labels differ. Check if we can emit the NHCB.
if p.processNHCB() {
return EntryHistogram, nil
}
isNHCB = p.handleClassicHistogramSeries(p.lset)
} else {
// Labels are the same. Check if after an exponential histogram.
if p.lastHistogramExponential {
isNHCB = false
} else {
isNHCB = p.handleClassicHistogramSeries(p.lset)
}
}
if isNHCB && !p.keepClassicHistograms {
// Do not return the classic histogram series if it was converted to NHCB and we are not keeping classic histograms.
continue
}
return p.entry, p.err
case EntryHistogram:
p.bytes, p.ts, p.h, p.fh = p.parser.Histogram()
p.metricString = p.parser.Metric(&p.lset)
p.storeExponentialLabels()
case EntryType:
p.bName, p.typ = p.parser.Type()
}
if p.processNHCB() {
return EntryHistogram, nil
}
return p.entry, p.err
case EntryHistogram:
p.bytes, p.ts, p.h, p.fh = p.parser.Histogram()
p.metricString = p.parser.Metric(&p.lset)
p.storeExponentialLabels()
case EntryType:
p.bName, p.typ = p.parser.Type()
}
if p.processNHCB() {
return EntryHistogram, nil
}
return p.entry, p.err
}
// Return true if labels have changed and we should emit the NHCB.