d4ksn opened a new issue #2271:
URL: https://github.com/apache/rocketmq/issues/2271
```
this.consumeRequestQueue = new LinkedBlockingQueue<Runnable>();
this.consumeExecutor = new ThreadPoolExecutor(
this.defaultMQPushConsumer.getConsumeThreadMin(),
this.defaultMQPushConsumer.getConsumeThreadMax(),
1000 * 60,
TimeUnit.MILLISECONDS,
this.consumeRequestQueue,
new ThreadFactoryImpl("ConsumeMessageThread_"));
```
When I digged into the code, I found that the `ThreadPoolExecutor` in
`ConsumeMessageConcurrentlyService`/`ConsumeMessageOrderlyService` was
constructed with a `LinkedBlockingQueue` with unlimited capacity.
I think this consumer thread pool will never expand automatically, and the
thread count always keep at `consumeThreadMin`. So the `consumeThreadMax`
parameter is actually meaningless...
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