XiaoyiPeng opened a new pull request #3490:
URL: https://github.com/apache/rocketmq/pull/3490
**Make sure set the target branch to `develop`**
## What is the purpose of the change
1.fix(consumer): `DefaultMQPushConsumer#setConsumeThreadMax(int
consumeThreadMax)` has no effect.
2.fix(consumer): Handle RejectedExecutionException that may be encountered
when the call `ConsumeMessageConcurrentlyService#submitConsumeRequestLater`
## Brief changelog
1.Replace unlimited size `this.consumeRequestQueue = new
LinkedBlockingQueue<Runnable>()` with bounded queues when creating
`ConsumeMessageConcurrentlyService#consumeExecutor`, in order to make
`DefaultMQPushConsumer#setConsumeThreadMax(int consumeThreadMax)` to work.
2. `consumeExecutor.submit(consumeRequest)` may throw an
RejectedExecutionException in below code:
```
private void submitConsumeRequestLater(final ConsumeRequest consumeRequest) {
this.scheduledExecutorService.schedule(new Runnable() {
@Override
public void run() {
ConsumeMessageConcurrentlyService.this.consumeExecutor.submit(consumeRequest);
}
}, 5000, TimeUnit.MILLISECONDS);
}
```
but the program does not handle it.
## Verifying this change
XXXX
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