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https://issues.apache.org/jira/browse/BEAM-1146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aviem Zur updated BEAM-1146:
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Component/s: runner-spark
> Spark runner ~1m 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
>
> 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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