zhouyejoe commented on pull request #33078:
URL: https://github.com/apache/spark/pull/33078#issuecomment-879626748


   > I don't see any UTs added for all the issues that were identified with 
concurrency. Is there a problem in adding UTs for these cases?
   
   I added one unit test where the registerExecutor happens between multiple 
PushBlockStream.onData callbacks. 
   What additional unit tests should we add to test the concurrency? Public 
APIs are bundled with validateAndGetAppShuffleInfo(appId) and it should be safe 
here. 


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