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Use sampleBuf instead of maintaining lastValue. (#444)

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This cuts the size of memSize by 8B.

Signed-off-by: Brian Brazil <brian.brazil@robustperception.io>
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Brian Brazil 2018-11-14 14:02:32 +00:00 committed by GitHub
parent 10632217ce
commit 910f3021b0
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1 changed files with 1 additions and 4 deletions
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head.go
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@ -1364,7 +1364,6 @@ type memSeries struct {
firstChunkID int
nextAt int64 // Timestamp at which to cut the next chunk.
lastValue float64
sampleBuf [4]sample
pendingCommit bool // Whether there are samples waiting to be committed to this series.
@ -1432,7 +1431,7 @@ func (s *memSeries) appendable(t int64, v float64) error {
}
// We are allowing exact duplicates as we can encounter them in valid cases
// like federation and erroring out at that time would be extremely noisy.
if math.Float64bits(s.lastValue) != math.Float64bits(v) {
if math.Float64bits(s.sampleBuf[3].v) != math.Float64bits(v) {
return ErrAmendSample
}
return nil
@ -1504,8 +1503,6 @@ func (s *memSeries) append(t int64, v float64) (success, chunkCreated bool) {
c.maxTime = t
s.lastValue = v
s.sampleBuf[0] = s.sampleBuf[1]
s.sampleBuf[1] = s.sampleBuf[2]
s.sampleBuf[2] = s.sampleBuf[3]