func (cmd *cmdDump) DumpRDBFile(reader *bufio.Reader, writer *bufio.Writer, nsize int64) { var nread atomic2.Int64 wait := make(chan struct{}) go func() { defer close(wait) p := make([]byte, WriterBufferSize) for nsize != nread.Get() { cnt := iocopy(reader, writer, p, int(nsize-nread.Get())) nread.Add(int64(cnt)) } flushWriter(writer) }() for done := false; !done; { select { case <-wait: done = true case <-time.After(time.Second): } n := nread.Get() p := 100 * n / nsize log.Infof("total = %d - %12d [%3d%%]\n", nsize, n, p) } log.Info("dump: rdb done") }