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https://issues.apache.org/jira/browse/SPARK-14180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Gummelt updated SPARK-14180:
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Fix Version/s: 2.0.0
> Deadlock in CoarseGrainedExecutorBackend Shutdown
> -------------------------------------------------
>
> Key: SPARK-14180
> URL: https://issues.apache.org/jira/browse/SPARK-14180
> Project: Spark
> Issue Type: Bug
> Environment: master branch. commit
> d6dc12ef0146ae409834c78737c116050961f350
> Reporter: Michael Gummelt
> Priority: Blocker
> Fix For: 2.0.0
>
>
> 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.
> https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/rpc/netty/Dispatcher.scala#L216
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