[jira] [Commented] (BEAM-6021) Use Kryo spark.serializer instead of JavaSerializer

["Chamikara Jayalath (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-6021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16695208#comment-16695208 ] 

Chamikara Jayalath commented on BEAM-6021:
------------------------------------------

Changing fix version to 2.10.0.

Please mark this as a release blocker if you need the fix in 2.9.0.

> Use Kryo spark.serializer instead of JavaSerializer
> ---------------------------------------------------
>
>                 Key: BEAM-6021
>                 URL: https://issues.apache.org/jira/browse/BEAM-6021
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-spark
>    Affects Versions: 2.8.0
>            Reporter: Marek Simunek
>            Assignee: Marek Simunek
>            Priority: Major
>             Fix For: 2.10.0
>
>          Time Spent: 2h 10m
>  Remaining Estimate: 0h
>
> By default is set spark.serializer=org.apache.spark.serializer.JavaSerializer.
> Because all objects from user are using Beam coders it will affect only internal objects for spark translation.
> So why not use more optimal {{org.apache.spark.serializer.KryoSerializer}} and force spark runner contributors to register classes in {{BeamSparkRunnerRegistrator}} by setting 
> {{spark.kryo.registrationRequired=true)}}.
> More information about benefits of [kryo serialization|https://spark.apache.org/docs/latest/tuning.html#data-serialization] over java serializer.



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