Kan Zhang created SPARK-1475:
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             Summary: Draining event logging queue before stopping event logger
                 Key: SPARK-1475
                 URL: https://issues.apache.org/jira/browse/SPARK-1475
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
            Reporter: Kan Zhang
            Assignee: Kan Zhang
            Priority: Blocker
             Fix For: 1.0.0


When SparkListenerBus thread is stopped, its event queue needs to be drained. 
And this needs to happen before event logger is stopped. Otherwise, any events 
still waiting to be processed in queue will be lost and consequently event log 
file may be incomplete. 



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