lhotari commented on pull request #14231:
URL: https://github.com/apache/pulsar/pull/14231#issuecomment-1036309041


   > looks like we don't have to synchronize here because we can accept the 
incorrect pending messages at a moment?
   
   That is risky. It's undefined what the behavior of ArrayDeque would be if 
it's accessed without proper synchronization. Usually it would be "just" a data 
consistency issue. In the case of java.util.HashMap, concurrent modifications 
and access c[ould lead to an infinite loop before Java 
8](https://stackoverflow.com/a/44180452).


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