srowen commented on pull request #29392:
URL: https://github.com/apache/spark/pull/29392#issuecomment-671068777


   How does this error arise BTW? when did you encounter it and what was the 
stack trace? I'm not so clear how this comes up in practice.
   It sounds good to synchronize but this is serializing all reads now too, 
which has its own implications


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