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quicker to adapt to pattern change

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This commit is contained in:
chrislu
2022-08-07 10:14:01 -07:00
parent 928d29af9e
commit 0aeec04c31
2 changed files with 16 additions and 4 deletions
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10
weed/mount/page_writer_pattern.go
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@@ -6,6 +6,8 @@ type WriterPattern struct {
chunkSize int64
}
const ModeChangeLimit = 3
// For streaming write: only cache the first chunk
// For random write: fall back to temp file approach
// writes can only change from streaming mode to non-streaming mode
@@ -20,9 +22,13 @@ func NewWriterPattern(chunkSize int64) *WriterPattern {
func (rp *WriterPattern) MonitorWriteAt(offset int64, size int) {
if rp.lastWriteStopOffset == offset {
rp.isSequentialCounter++
if rp.isSequentialCounter < ModeChangeLimit {
rp.isSequentialCounter++
}
} else {
rp.isSequentialCounter--
if rp.isSequentialCounter > -ModeChangeLimit {
rp.isSequentialCounter--
}
}
rp.lastWriteStopOffset = offset + int64(size)
}