Kousuke Saruta created SPARK-25265:
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Summary: Fix memory leak vulnerability in Barrier Execution Mode
Key: SPARK-25265
URL: https://issues.apache.org/jira/browse/SPARK-25265
Project: Spark
Issue Type: Bug
Components: Scheduler, Spark Core
Affects Versions: 2.4.0
Reporter: Kousuke Saruta
Assignee: Kousuke Saruta
BarrierCoordinator$ uses Timer and TimerTask. `TimerTask#cancel()` is invoked
in ContextBarrierState#cancelTimerTask but `Timer#purge()` is never invoked.
Once a TimerTask is scheduled, the reference to it is not released until
`Timer#purge()` is invoked even though `TimerTask#cancel()` is invoked.
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