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https://issues.apache.org/jira/browse/SPARK-30271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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angerszhu resolved SPARK-30271.
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Resolution: Fixed
> dynamic allocation won't release some executor in some case.
> ------------------------------------------------------------
>
> Key: SPARK-30271
> URL: https://issues.apache.org/jira/browse/SPARK-30271
> Project: Spark
> Issue Type: Bug
> Components: Scheduler, Spark Core
> Affects Versions: 2.4.0
> Reporter: angerszhu
> Priority: Major
>
> Case :
> max executor 5
> min executor 0
> idle time 5s
> stage-1 10 tasks run in 5 executors.
> If stage-1 finished in 5 all executors, all executor added to `removeTimes`
> when taskEnd event.
> After 5s, start release process, since stage-2 have 20 tasks, then executor
> won't be removed since existing executor num < executorTargetNum., and
> executor will be removed from `removeTimes`.
> But if task won't be scheduled to all these executors, if executor-1 won't
> have task to run in it, it won't be put into `removeTimes` and if there are
> no more tasks, executor won't be removed forever
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