[jira] [Created] (SPARK-14180) Deadlock in CoarseGrainedExecutorBackend Shutdown

["Michael Gummelt (JIRA)" <ji...@apache.org>]

Michael Gummelt created SPARK-14180:
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             Summary: Deadlock in CoarseGrainedExecutorBackend Shutdown
                 Key: SPARK-14180
                 URL: https://issues.apache.org/jira/browse/SPARK-14180
             Project: Spark
          Issue Type: Bug
    Affects Versions: 2.0.0
         Environment: master branch.  commit d6dc12ef0146ae409834c78737c116050961f350
            Reporter: Michael Gummelt
            Priority: Blocker


I'm fairly certain that https://github.com/apache/spark/pull/11031 introduced a deadlock in executor shutdown.  The result is executor shutdown hangs indefinitely.  In Mesos at least, this lasts until {{spark.mesos.coarse.shutdownTimeout}} (default 10s), at which point the driver stops, which force kills the executors.

The deadlock is as follows:
- CoarseGrainedExecutorBackend receives a Shutdown message, which now blocks on rpcEnv.awaitTermination() https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/SparkEnv.scala#L95
- rpcEnv.awaitTermination() blocks on dispatcher.awaitTermination(), which blocks until all dispatcher threads (MessageLoop threads) terminate
- However, the initial Shutdown message handling is itself handled by a Dispatcher MessageLoop thread.  This mutual dependence results in a deadlock.



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