XiaoyiPeng opened a new issue #3493:
URL: https://github.com/apache/rocketmq/issues/3493
**BUG REPORT**
1. Please describe the issue you observed:
a): `DefaultMQPushConsumer#setConsumeThreadMax(int consumeThreadMax)`
has no effect.
b): Potential memory exhaustion risk
When program creating the thread pool
`ConsumeMessageConcurrentlyService#consumeExecutor`, a blocking queue with no
length limit was used, as shown below :
```
public ConsumeMessageConcurrentlyService(DefaultMQPushConsumerImpl
defaultMQPushConsumerImpl,
MessageListenerConcurrently messageListener) {
\\...
this.consumeRequestQueue = new LinkedBlockingQueue<Runnable>();
this.consumeExecutor = new ThreadPoolExecutor(
this.defaultMQPushConsumer.getConsumeThreadMin(),
this.defaultMQPushConsumer.getConsumeThreadMax(),
1000 * 60,
TimeUnit.MILLISECONDS,
this.consumeRequestQueue,
new ThreadFactoryImpl("ConsumeMessageThread_"));
\\...
}
```
This will probably lead to :
a): a potential risk of running out of memory,
b): `DefaultMQPushConsumer#setConsumeThreadMax(int
consumeThreadMax) ` has no effect.
2. Please tell us about your environment:
Windows10
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