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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