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kvstore_compaction.go
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/
kvstore_compaction.go
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package storage
import (
"encoding/binary"
"time"
)
func (s *store) scheduleCompaction(compactMainRev int64, keep map[revision]struct{}) {
defer s.wg.Done()
totalStart := time.Now()
defer dbCompactionTotalDurations.Observe(float64(time.Now().Sub(totalStart) / time.Millisecond))
end := make([]byte, 8)
binary.BigEndian.PutUint64(end, uint64(compactMainRev+1))
batchsize := int64(10000)
last := make([]byte, 8+1+8)
for {
var rev revision
start := time.Now()
tx := s.b.BatchTx()
tx.Lock()
keys, _ := tx.UnsafeRange(keyBucketName, last, end, batchsize)
for _, key := range keys {
rev = bytesToRev(key)
if _, ok := keep[rev]; !ok {
tx.UnsafeDelete(keyBucketName, key)
}
}
if len(keys) < int(batchsize) {
rbytes := make([]byte, 8+1+8)
revToBytes(revision{main: compactMainRev}, rbytes)
tx.UnsafePut(metaBucketName, finishedCompactKeyName, rbytes)
tx.Unlock()
return
}
// update last
revToBytes(revision{main: rev.main, sub: rev.sub + 1}, last)
tx.Unlock()
dbCompactionPauseDurations.Observe(float64(time.Now().Sub(start) / time.Millisecond))
select {
case <-time.After(100 * time.Millisecond):
case <-s.stopc:
return
}
}
}