Kenneth Knowles created BEAM-6561:
-------------------------------------

             Summary: WorkProgressUpdater synchronizes on java.util.concurrent 
classes
                 Key: BEAM-6561
                 URL: https://issues.apache.org/jira/browse/BEAM-6561
             Project: Beam
          Issue Type: Bug
          Components: runner-dataflow
            Reporter: Kenneth Knowles


Findbugs caught this. There seems to be synchronization on variables where the 
classes themselves have their own mechanisms. If intended, it should be made 
more clear by simple mutexes.



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