[jira] [Commented] (SPARK-19757) Executor with task scheduled could be killed due to idleness

["Jimmy Xiang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-19757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15886838#comment-15886838 ] 

Jimmy Xiang commented on SPARK-19757:
-------------------------------------

In class CoarseGrainedSchedulerBackend, killExecutors makes sure an executor is not busy before killing it. However, makeOffers could schedule a task to the executor right after killExecutors thinks it is not busy.

I think we should improve makeOffers to add some synchronization for checking if an executor is alive and schedule task to it.

> Executor with task scheduled could be killed due to idleness
> ------------------------------------------------------------
>
>                 Key: SPARK-19757
>                 URL: https://issues.apache.org/jira/browse/SPARK-19757
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 1.6.0
>            Reporter: Jimmy Xiang
>            Priority: Minor
>
> With dynamic executor allocation enabled on yarn mode, after one job is finished for a while, submit another job, then there is race between killing idle executors and scheduling new task on these executors. Sometimes, some executor is killed right after a task is scheduled on it.



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