[jira] [Commented] (BEAM-1146) Decrease spark runner startup overhead

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-1146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15792898#comment-15792898 ] 

ASF GitHub Bot commented on BEAM-1146:
--------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/beam/pull/1674


> Decrease spark runner startup overhead
> --------------------------------------
>
>                 Key: BEAM-1146
>                 URL: https://issues.apache.org/jira/browse/BEAM-1146
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-spark
>            Reporter: Aviem Zur
>            Assignee: Aviem Zur
>
> BEAM-921 introduced a lazy singleton instantiated once in each machine (driver & executors) which utilizes reflection to find all subclasses of Source and Coder
> While this is beneficial in it's own right, the change added about one minute of overhead in spark runner startup time (which cause the first job/stage to take up to a minute).
> The change is in class {{BeamSparkRunnerRegistrator}}
> The reason reflection (specifically reflections library) was used here is because  there is no current way of knowing all the source and coder classes at runtime.



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