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add key dedupe when a write buffer writeback to an empty read buffer bucket.

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Signed-off-by: Siyuan Zhang <sizhang@google.com>
This commit is contained in:
Siyuan Zhang 2024-01-12 09:34:57 -08:00
parent 1901c85a8c
commit 4142d49eea
1 changed files with 8 additions and 2 deletions
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10
server/mvcc/backend/tx_buffer.go
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@ -80,6 +80,7 @@ func (txw *txWriteBuffer) writeback(txr *txReadBuffer) {
rb, ok := txr.buckets[k]
if !ok {
delete(txw.buckets, k)
wb.dedupe()
txr.buckets[k] = wb
continue
}
@ -201,10 +202,15 @@ func (bb *bucketBuffer) merge(bbsrc *bucketBuffer) {
if bytes.Compare(bb.buf[(bb.used-bbsrc.used)-1].key, bbsrc.buf[0].key) < 0 {
return
}
bb.dedupe()
}
// dedupe removes duplicates, using only newest update
func (bb *bucketBuffer) dedupe() {
if bb.used <= 1 {
return
}
sort.Stable(bb)
// remove duplicates, using only newest update
widx := 0
for ridx := 1; ridx < bb.used; ridx++ {
if !bytes.Equal(bb.buf[ridx].key, bb.buf[widx].key) {