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https://issues.apache.org/jira/browse/BEAM-1810?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aviem Zur resolved BEAM-1810.
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Resolution: Fixed
Fix Version/s: First stable release
> Spark runner combineGlobally uses Kryo serialization
> ----------------------------------------------------
>
> Key: BEAM-1810
> URL: https://issues.apache.org/jira/browse/BEAM-1810
> Project: Beam
> Issue Type: Bug
> Components: runner-spark
> Reporter: Aviem Zur
> Assignee: Aviem Zur
> Fix For: First stable release
>
>
> {{TransformTranslator#combineGlobally}} inadvertently uses Kryo serialization
> to serialize data. This should never happen.
> This is due to Spark's implementation of {{RDD.isEmpty}} which takes the
> first element to check if there are elements in the {{RDD}}, it is then
> serialized with Spark's configured serializer (In our case, Kryo).
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