[jira] [Commented] (SPARK-21115) If the cores left is less than the coresPerExecutor,the cores left will not be allocated, so it should not to check in every schedule

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

    [ https://issues.apache.org/jira/browse/SPARK-21115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16051427#comment-16051427 ] 

Apache Spark commented on SPARK-21115:
--------------------------------------

User 'eatoncys' has created a pull request for this issue:
https://github.com/apache/spark/pull/18322

> If the cores left is less than the coresPerExecutor,the cores left will not be allocated, so it should not to check in every schedule
> -------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-21115
>                 URL: https://issues.apache.org/jira/browse/SPARK-21115
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 2.1.1
>            Reporter: eaton
>            Priority: Minor
>
> If we start an app with the param --total-executor-cores=4 and spark.executor.cores=3, the cores left is always 1, so it will try to allocate executors in the function org.apache.spark.deploy.master.startExecutorsOnWorkers in every schedule.
> Another question is, is it will be better to allocate another executor with 1 core for the cores left.



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