[GitHub] [pulsar] leizhiyuan edited a comment on issue #11604: Got exception java.lang.UnsupportedOperationException: MessageId is null。Using Reader

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leizhiyuan edited a comment on issue #11604:
URL: https://github.com/apache/pulsar/issues/11604#issuecomment-895182485


   
![image](https://user-images.githubusercontent.com/2684384/128705973-f4ef264f-ff43-4b46-a2b4-672d3f1b2147.png)
   
   maybe there is a concurrent bug。 
   
   
   ```
     if (lastCumulativeAck.messageId == null) {. // 1. is not null
               return false;
           }
           if (messageId.compareTo(lastCumulativeAck.messageId) <= 0) { 
//2.another thread change the messageId to null
               // Already included in a cumulative ack
               return true;
           } else {
               return pendingIndividualAcks.contains(messageId);
           }
   ```


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