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https://issues.apache.org/jira/browse/SPARK-27348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16812396#comment-16812396
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Sandeep Katta commented on SPARK-27348:
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[~zsxwing] do you have any test code or scenario which can suffice your
statement ?
> HeartbeatReceiver doesn't remove lost executors from
> CoarseGrainedSchedulerBackend
> ----------------------------------------------------------------------------------
>
> Key: SPARK-27348
> URL: https://issues.apache.org/jira/browse/SPARK-27348
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.4.0
> Reporter: Shixiong Zhu
> Priority: Major
>
> When a heartbeat timeout happens in HeartbeatReceiver, it doesn't remove lost
> executors from CoarseGrainedSchedulerBackend. When a connection of an
> executor is not gracefully shut down, CoarseGrainedSchedulerBackend may not
> receive a disconnect event. In this case, CoarseGrainedSchedulerBackend still
> thinks a lost executor is still alive. CoarseGrainedSchedulerBackend may ask
> TaskScheduler to run tasks on this lost executor. This task will never finish
> and the job will hang forever.
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