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WAL loading: don't send empty buffers over chan (#11319) 

If some shards did not get any samples mapped, the buffer will be empty
so sending it over the chan to `processWALSamples()` is a waste of time.

This is especially likely now we are checking `minValidTime` before
sending.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2022-09-20 15:13:30 +01:00 committed by GitHub
parent 9591103bb9
commit af6167df58
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1 changed files with 7 additions and 2 deletions
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9
tsdb/head_wal.go
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@ -247,7 +247,9 @@ Outer:
m = len(samples)
}
for i := 0; i < n; i++ {
shards[i] = processors[i].reuseBuf()
if shards[i] == nil {
shards[i] = processors[i].reuseBuf()
}
}
for _, sam := range samples[:m] {
if sam.T < minValidTime {
@ -260,7 +262,10 @@ Outer:
shards[mod] = append(shards[mod], sam)
}
for i := 0; i < n; i++ {
processors[i].input <- walSubsetProcessorInputItem{samples: shards[i]}
if len(shards[i]) > 0 {
processors[i].input <- walSubsetProcessorInputItem{samples: shards[i]}
shards[i] = nil
}
}
samples = samples[m:]
}