lhotari commented on PR #4171:
URL: https://github.com/apache/bookkeeper/pull/4171#issuecomment-1886563389

   @graysonzeng I have a question about the problem description:
   
   > After a deep investigation, we found the cause of the error。The root cause 
due to sendAddSuccessCallbacks may be multiple called at the same time. One is 
that unsetSuccessAndSendWriteRequest is called by the 
BookKeeperClientWorker-OrderedExecutor thread, and the other is writeCompletein 
pulsar-io thread. We should prevent sendAddSuccessCallbacks from being called 
again before it completes.
   
   Why does it exactly cause a problem when the method is called multiple times 
at the same time?


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