[jira] [Updated] (SPARK-21656) spark dynamic allocation should not idle timeout executors when tasks still to run

["Thomas Graves (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-21656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Graves updated SPARK-21656:
----------------------------------
    Issue Type: Bug  (was: Improvement)

> spark dynamic allocation should not idle timeout executors when tasks still to run
> ----------------------------------------------------------------------------------
>
>                 Key: SPARK-21656
>                 URL: https://issues.apache.org/jira/browse/SPARK-21656
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.1.1
>            Reporter: Jong Yoon Lee
>            Priority: Minor
>             Fix For: 2.1.1
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> Right now spark lets go of executors when they are idle for the 60s (or configurable time). I have seen spark let them go when they are idle but they were really needed. I have seen this issue when the scheduler was waiting to get node locality but that takes longer then the default idle timeout. In these jobs the number of executors goes down really small (less than 10) but there are still like 80,000 tasks to run.
> We should consider not allowing executors to idle timeout if they are still needed according to the number of tasks to be run.



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