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Ensure lastMmapRef set to 0 if mmapRefs is empty

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Signed-off-by: Carrie Edwards <edwrdscarrie@gmail.com>
This commit is contained in:
Carrie Edwards 2024-07-16 09:01:08 -07:00
parent 79b53bd3de
commit 02f05cbf2c
1 changed files with 6 additions and 1 deletions
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7
tsdb/ooo_head_read.go
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@ -349,12 +349,17 @@ func NewOOOCompactionHead(ctx context.Context, head *Head) (*OOOCompactionHead,
continue
}
var lastMmapRef chunks.ChunkDiskMapperRef
mmapRefs := ms.mmapCurrentOOOHeadChunk(head.chunkDiskMapper)
if len(mmapRefs) == 0 && len(ms.ooo.oooMmappedChunks) > 0 {
// Nothing was m-mapped. So take the mmapRef from the existing slice if it exists.
mmapRefs = []chunks.ChunkDiskMapperRef{ms.ooo.oooMmappedChunks[len(ms.ooo.oooMmappedChunks)-1].ref}
}
lastMmapRef := mmapRefs[len(mmapRefs)-1]
if len(mmapRefs) == 0 {
lastMmapRef = 0
} else {
lastMmapRef = mmapRefs[len(mmapRefs)-1]
}
seq, off := lastMmapRef.Unpack()
if seq > lastSeq || (seq == lastSeq && off > lastOff) {
ch.lastMmapRef, lastSeq, lastOff = lastMmapRef, seq, off