[jira] [Commented] (SPARK-12554) Standalone app scheduler will hang when app.coreToAssign < minCoresPerExecutor

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-12554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15073750#comment-15073750 ] 

Apache Spark commented on SPARK-12554:
--------------------------------------

User 'JerryLead' has created a pull request for this issue:
https://github.com/apache/spark/pull/10507

> Standalone app scheduler will hang when app.coreToAssign < minCoresPerExecutor
> ------------------------------------------------------------------------------
>
>                 Key: SPARK-12554
>                 URL: https://issues.apache.org/jira/browse/SPARK-12554
>             Project: Spark
>          Issue Type: Bug
>          Components: Deploy, Scheduler
>    Affects Versions: 1.5.2
>            Reporter: Lijie Xu
>            Priority: Critical
>
> In scheduleExecutorsOnWorker() in Master.scala,
> *val keepScheduling = coresToAssign >= minCoresPerExecutor* should be changed to *val keepScheduling = coresToAssign > 0*
> Suppose that an app's requested cores is 10 (i.e., spark.cores.max = 10) and app.coresPerExecutor is 4 (i.e., spark.executor.cores = 4). 
> After allocating two executors (each has 4 cores) to the app, the *coresToAssign = 2* and *minCoresPerExecutor = coresPerExecutor = 4*, so *keepScheduling = false* and no extra executor will be allocated to the app. As a result, the app and the scheduler will hang.



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