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https://issues.apache.org/jira/browse/SPARK-2945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14091817#comment-14091817
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Sandy Ryza commented on SPARK-2945:
-----------------------------------
spark.executor.instances apparently isn't used for anything other than the
calculations for how long to wait for executors to register before running
jobs. So I believe there actually would be some work required to make
spark.executor.instances function this way.
> 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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