[jira] [Updated] (SPARK-2945) Allow specifying num of executors in the context configuration

["Patrick Wendell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-2945?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Patrick Wendell updated SPARK-2945:
-----------------------------------

    Component/s: YARN

> Allow specifying num of executors in the context configuration
> --------------------------------------------------------------
>
>                 Key: SPARK-2945
>                 URL: https://issues.apache.org/jira/browse/SPARK-2945
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core, YARN
>    Affects Versions: 1.0.0
>         Environment: Ubuntu precise, on YARN (CDH 5.1.0)
>            Reporter: Shay Rojansky
>
> Running on YARN, the only way to specify the number of executors seems to be on the command line of spark-submit, via the --num-executors switch.
> In many cases this is too early. Our Spark app receives some cmdline arguments which determine the amount of work that needs to be done - and that affects the number of executors it ideally requires. Ideally, the Spark context configuration would support specifying this like any other config param.
> Our current workaround is a wrapper script that determines how much work is needed, and which itself launches spark-submit with the number passed to --num-executors - it's a shame to have to do this.



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