Github user srowen commented on the pull request:

    https://github.com/apache/spark/pull/4871#issuecomment-76948970
  
    @o-mdr I'm referring to read of the `stopped` member elsewhere in this 
class. Yes of course `synchronized` excludes two threads from executing this 
block simultaneously. This is not true of reads of this field elsewhere in the 
class.


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