[jira] [Resolved] (SPARK-30271) dynamic allocation won't release some executor in some case.

["angerszhu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-30271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

angerszhu resolved SPARK-30271.
-------------------------------
    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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