[jira] [Commented] (SPARK-809) Give newly registered apps a set of executors right away

["Andrew Ash (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14212068#comment-14212068 ] 

Andrew Ash commented on SPARK-809:
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I believe this situation hasn't changed?

Looking a little at the master branch (1.2) the standalone cluster still gets its {{defaultParallelism}} in {{CoarseGrainedSchedulerBackend}} from the {{totalCoreCount}} that is incremented/decremented as executors join/leave the driver's awareness.

> Give newly registered apps a set of executors right away
> --------------------------------------------------------
>
>                 Key: SPARK-809
>                 URL: https://issues.apache.org/jira/browse/SPARK-809
>             Project: Spark
>          Issue Type: New Feature
>          Components: Deploy
>            Reporter: Matei Zaharia
>            Priority: Minor
>
> Right now, newly connected apps in the standalone cluster will not set a good defaultParallelism value if they create RDDs right after creating a SparkContext, because the executorAdded calls are asynchronous and happen after. It would be nice to wait for a few such calls before returning from the scheduler initializer.



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