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enhancement: 1. don't flush the page if it's last fragment of the record

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2. if it's last record of the bacth, flush the page after it written into the page

Signed-off-by: YaoZengzeng <yaozengzeng@zju.edu.cn>
This commit is contained in:
YaoZengzeng 2019-07-12 12:15:16 +08:00
parent 45ee02add5
commit 104566ae53
1 changed files with 10 additions and 6 deletions
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16
wal/wal.go
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@ -615,17 +615,21 @@ func (w *WAL) log(rec []byte, final bool) error {
copy(buf[recordHeaderSize:], part)
p.alloc += len(part) + recordHeaderSize
// By definition when a record is split it means its size is bigger than
// the page boundary so the current page would be full and needs to be flushed.
// On contrary if we wrote a full record, we can fit more records of the batch
// into the page before flushing it.
if final || typ != recFull || w.page.full() {
if err := w.flushPage(false); err != nil {
if w.page.full() {
if err := w.flushPage(true); err != nil {
return err
}
}
rec = rec[l:]
}
// If it's the final record of the batch and the page is not empty, flush it.
if final && w.page.alloc > 0 {
if err := w.flushPage(false); err != nil {
return err
}
}
return nil
}