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lib/persistentqueue: sync data to file inside filestream.Writer.MustFlush

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This commit is contained in:
Aliaksandr Valialkin 2020-09-19 12:51:32 +03:00
parent 26115891db
commit f00e0e0103
2 changed files with 10 additions and 5 deletions
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10
lib/filestream/filestream.go
View File

@ -254,11 +254,17 @@ func (w *Writer) Write(p []byte) (int, error) {
}
// MustFlush flushes all the buffered data to file.
func (w *Writer) MustFlush() {
//
// if isSync is true, then the flushed data is fsynced to the underlying storage.
func (w *Writer) MustFlush(isSync bool) {
if err := w.bw.Flush(); err != nil {
logger.Panicf("FATAL: cannot flush buffered data to file %q: %s", w.f.Name(), err)
}
// Do not call w.f.Sync() for performance reasons.
if isSync {
if err := w.f.Sync(); err != nil {
logger.Panicf("FATAL: cannot fsync data to the underlying storage for file %q: %s", w.f.Name(), err)
}
}
}
type statWriter struct {

5
lib/persistentqueue/persistentqueue.go
View File

@ -546,7 +546,7 @@ func (q *Queue) write(buf []byte) error {
func (q *Queue) readFull(buf []byte) error {
bufLen := uint64(len(buf))
if q.readerOffset+bufLen > q.writerFlushedOffset {
q.writer.MustFlush()
q.writer.MustFlush(false)
q.writerFlushedOffset = q.writerOffset
}
n, err := io.ReadFull(q.reader, buf)
@ -567,8 +567,7 @@ func (q *Queue) flushMetainfoIfNeededLocked(flushData bool) error {
return nil
}
if flushData {
q.writer.MustFlush()
fs.MustSyncPath(q.writerPath)
q.writer.MustFlush(true)
}
if err := q.flushMetainfoLocked(); err != nil {
return fmt.Errorf("cannot flush metainfo: %w", err)