[GitHub] [pulsar] gaozhangmin opened a new pull request #12343: fix lastCumulativeAck.messageId npe when PersistentAcknowledgmentsGroupingTracker.flushSync

Wed, 13 Oct 2021 04:42:46 -0700 


gaozhangmin opened a new pull request #12343:
URL: https://github.com/apache/pulsar/pull/12343


    Reader ACK would be  stuck:
   
![image](https://user-images.githubusercontent.com/9278488/137125423-0ba68950-63db-4b33-a9e9-6acc482c94f7.png)
   This was caused by: 
   `flushAsync` is executed by `scheduledTask`,  Any thrown exception or error 
reaching the executor causes the executor to halt。
   
   The exception is as below:
   
   
![image](https://user-images.githubusercontent.com/9278488/137125216-9564a9dc-a3a1-44df-94a7-c46e3ddf4832.png)
   


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