panzhi33 commented on issue #3624:
URL: https://github.com/apache/rocketmq/issues/3624#issuecomment-992451468
> > @haozhijie9527 @areyouok Please help to check again
>
> The synchronized block in RequestFutureHolder is not safe enough.
Concurrent problem still exists.
>
> I sugguest move DefaultMQProducerImpl.startScheduledTask() and
>
> ```
> if
(RequestFutureHolder.getInstance().getProducerNum().decrementAndGet() == 0) {
>
RequestFutureHolder.getInstance().getScheduledExecutorService().shutdown();
> }
> ```
>
> to RequestFutureHolder.
OK, it’s been revised, please take a look
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