Jaskey opened a new pull request #2084:
URL: https://github.com/apache/rocketmq/pull/2084


   ## What is the purpose of the change
   
   For now, RocketMQ does not support a graceful shutdown for push consumer, 
which means that when a user shutdown a push consumer, the threadpool will 
shutdown but rocketmq client will not wait for the existing task to be 
completed, which may cause 
   1. Error is found when shutdown. Since the application since application may 
shutdown some external source like datasource when application shutdowns, so 
the existing task may fail.
   2. Message duplication. Even though the task can be completed, since 
rocketmq will update consumer offset after the shutdown method returns, so the 
latest consumer offset should be updated after the remaining tasks are completed
   
   ## Brief changelog
   
   Add a parameter awaitTerminationMillisWhenShutdown(default is 0), to 
determine how long should the rocketmq client to await for the consumer 
threadpool to terminate before update consumer offset
   


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