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https://issues.apache.org/jira/browse/SPARK-8119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15150055#comment-15150055
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Zhen Peng commented on SPARK-8119:
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Hi [~srowen], I think it's really a serious bug, do you have any reason for not
back-porting it to 1.4.x?
> HeartbeatReceiver should not adjust application executor resources
> ------------------------------------------------------------------
>
> Key: SPARK-8119
> URL: https://issues.apache.org/jira/browse/SPARK-8119
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.4.0
> Reporter: SaintBacchus
> Assignee: Andrew Or
> Priority: Critical
> Fix For: 1.5.0
>
>
> DynamicAllocation will set the total executor to a little number when it
> wants to kill some executors.
> But in no-DynamicAllocation scenario, Spark will also set the total executor.
> So it will cause such problem: sometimes an executor fails down, there is no
> more executor which will be pull up by spark.
> === EDIT by andrewor14 ===
> The issue is that the AM forgets about the original number of executors it
> wants after calling sc.killExecutor. Even if dynamic allocation is not
> enabled, this is still possible because of heartbeat timeouts.
> I think the problem is that sc.killExecutor is used incorrectly in
> HeartbeatReceiver. The intention of the method is to permanently adjust the
> number of executors the application will get. In HeartbeatReceiver, however,
> this is used as a best-effort mechanism to ensure that the timed out executor
> is dead.
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