iamqq23ue edited a comment on issue #2706:
URL: https://github.com/apache/rocketmq/issues/2706#issuecomment-805580778
> > > > when the flush is abnormal ，SEND_OK will still be returned 。It will
cause possible message loss .
> > > > I will submit a PR to fix it
> > > > code show as below ：
> > > > ```java
> > > > public int flush(final int flushLeastPages) {
> > > > if (this.isAbleToFlush(flushLeastPages)) {
> > > > if (this.hold()) {
> > > > int value = getReadPosition();
> > > >
> > > > try {
> > > > //We only append data to fileChannel or
mappedByteBuffer, never both.
> > > > if (writeBuffer != null ||
this.fileChannel.position() != 0) {
> > > > this.fileChannel.force(false);
> > > > } else {
> > > > this.mappedByteBuffer.force();
> > > > }
> > > > } catch (Throwable e) {
> > > > log.error("Error occurred when force data to disk.",
e);
> > > > }
> > > >
> > > > this.flushedPosition.set(value);
> > > > this.release();
> > > > } else {
> > > > log.warn("in flush, hold failed, flush offset = " +
this.flushedPosition.get());
> > > > this.flushedPosition.set(getReadPosition());
> > > > }
> > > > }
> > > > return this.getFlushedPosition();
> > > > }
> > > > ```
> > >
> > >
> > > Can u details the situation, such as rmq version, and replicas setting?
> >
> >
> > You can see that if there is an error, a try catch will be performed
.Then log.error("Error occurred when force data to disk.", e);
> > But there is no error code returned to the client, and the client still
thinks that the send is successful.
>
> org.apache.rocketmq.store.CommitLog.GroupCommitService#doCommit
> You can see this method，if flush failed，the flushedWhere offset will not
change。Then the value of PutMessageStatus will be FLUSH_DISK_TIMEOUT
I do not think so.
First of all, I can reproduce the problem. If the flush fails, it will still
return SEND_OK. And after modifying the code, the problem is solved.So there
must be a problem
From the code analysis, even if the flush fails, docommit does not know.
this.flushedPosition.set(value) will be executed no matter what。
You can try to make the file system read-only, and then you can reproduce
the problem
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
