Ted Yu created FLINK-5855:
-----------------------------

             Summary: Unprotected access to pendingFilesPerCheckpoint in 
BucketingSink
                 Key: FLINK-5855
                 URL: https://issues.apache.org/jira/browse/FLINK-5855
             Project: Flink
          Issue Type: Bug
            Reporter: Ted Yu
            Priority: Minor


{code}    
handlePendingFilesForPreviousCheckpoints(restoredState.pendingFilesPerCheckpoint);

    synchronized (restoredState.pendingFilesPerCheckpoint) {
      restoredState.pendingFilesPerCheckpoint.clear();
{code}
Lock on pendingFilesPerCheckpoint should be obtained prior to the call to 
handlePendingFilesForPreviousCheckpoints().



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