lordcheng10 commented on PR #18633:
URL: https://github.com/apache/pulsar/pull/18633#issuecomment-1327983887

   > > When the 1121 line of code is executed, the consumers list may be empty
   > 
   > i wonder why this will happen? is there some race-condition here ?
   
   For example:
   The test1 topic has 10 partitions, and the handleSubscribeOneTopicError 
method is executed for each partition.
   Assuming that test1-partition-0 executes the handleSubscribeOneTopicError 
method first, all the consumers collection will be removed, so that when the 
subsequent partition executes handleSubscribeOneTopicError, the corresponding 
subscribeResult will not be completed, resulting in blocking:
   
https://github.com/apache/pulsar/blob/006559dbfa5613e4b4b622416375e5bcbd1d580d/pulsar-client/src/main/java/org/apache/pulsar/client/impl/MultiTopicsConsumerImpl.java#L1130-L1139


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