buptxxb65 commented on PR #6417:
URL: https://github.com/apache/rocketmq/pull/6417#issuecomment-1500143600

   Hi @RongtongJin , I created an example for the DefaultLitePullConsumer. To 
use this example testing the Async pull, we need to change the line 680 in 
DefaultLitePullConsumerImpl into `PullTaskImpl pullTask = new 
PullTaskImpl(messageQueue, CommunicationMode.ASYNC);`
   
   Here is the conclusion of its performance.
   1. When the message is consumed **successfully**,
   Different queues will run in concurrently, while the message in the same 
queue will be consumed orderly. We can check the QueueId and QueueOffset of 
messageExts to confirm it. I think this meets our expectations.
   
   2. When the message is consumed **unsuccessfully**,
   The exception will call the onException() in the pullCallback we defined in 
line 989. The pullDelayTimeMills will be changed according to the type of the 
exception. It will be set as the delay of the scheduledThreadPoolExecutor.
   
   That's all of the test. I would appreciate if you have any better idea of 
the test and I'm happy to do anything I can to improve it.


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