RongtongJin commented on issue #184: The config 'consumeThreadMax' is useless in annotation @RocketMQMessageListener URL: https://github.com/apache/rocketmq-spring/issues/184#issuecomment-559430882 > > This parameter is valid. The relevant code is below > > https://github.com/apache/rocketmq-spring/blob/e5f28fec78f98b2ce877a4f4f4b1fbbcae248933/rocketmq-spring-boot/src/main/java/org/apache/rocketmq/spring/support/DefaultRocketMQListenerContainer.java#L208 > > > > https://github.com/apache/rocketmq-spring/blob/e5f28fec78f98b2ce877a4f4f4b1fbbcae248933/rocketmq-spring-boot/src/main/java/org/apache/rocketmq/spring/support/DefaultRocketMQListenerContainer.java#L468 > > > > Because this is the maximum number of threads in the thread pool, the maximum number of threads will not be reached when the concurrency is small. > > thank you for your reply! > For 'rocketmq-spring', this parameter is "valid". However, after reading the source code of rocketmq-client, in class 'ConsumeMessageConcurrentlyService' > > ``` > this.consumeRequestQueue = new LinkedBlockingQueue<Runnable>(); > > this.consumeExecutor = new ThreadPoolExecutor( > this.defaultMQPushConsumer.getConsumeThreadMin(), > this.defaultMQPushConsumer.getConsumeThreadMax(), > 1000 * 60, > TimeUnit.MILLISECONDS, > this.consumeRequestQueue, > new ThreadFactoryImpl("ConsumeMessageThread_")); > ``` > > You will find that the threads will only increase when the LinkedBlockingQueue is full, but the queue has no capacity set. So the thread never grows to its maximum. > ThreadPoolExecutor only increases threads to the maximum when using a SynchronousQueue queue or a LinkedBlockingQueue with limited capacity. > If we use RocketMQMessageListener to declare consumers, we have no way to increase the number of threads to more than 20. You are right. And you can submit a issue to the rocketmq main repo.
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