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Flush vlog buffer if it grows beyond threshold #1067

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merged 4 commits into from
Oct 10, 2019
Merged

Flush vlog buffer if it grows beyond threshold #1067

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1ad5160
Flush vlog buffer if it grows beyond threshold
Oct 4, 2019
e58721b
Remove unreliable test
Oct 7, 2019
60c77f0
Address review comments
Oct 9, 2019
bd1c2b1
Address review comments
Oct 10, 2019
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12 changes: 12 additions & 0 deletions value.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1315,6 +1315,18 @@ func (vlog *valueLog) write(reqs []*request) error {
p.Len = uint32(plen)
b.Ptrs = append(b.Ptrs, p)
written++

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Can the buffer length be stored since it is retrieved multiple times?

bl := buf.Len()

if int64(buf.Len()) > vlog.db.opt.ValueLogFileSize {
vlog.elog.Printf("Flushing buffer of size %d to vlog", buf.Len())
n, err := curlf.fd.Write(buf.Bytes())
if err != nil {
return errors.Wrapf(err, "Unable to write to value log file: %q", curlf.path)
}
buf.Reset()
y.NumWrites.Add(1)
y.NumBytesWritten.Add(int64(n))
atomic.AddUint32(&vlog.writableLogOffset, uint32(n))
}
}
vlog.numEntriesWritten += uint32(written)
// We write to disk here so that all entries that are part of the same transaction are
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