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https://issues.apache.org/jira/browse/BEAM-838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tyson Hamilton closed BEAM-838.
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    Fix Version/s: 2.23.0
       Resolution: Won't Fix

Apex runner no longer supported and the code is being removed as part of 
BEAM-9999.

> Support parallelism in Apex runner
> ----------------------------------
>
>                 Key: BEAM-838
>                 URL: https://issues.apache.org/jira/browse/BEAM-838
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-apex
>            Reporter: Thomas Weise
>            Priority: P2
>              Labels: stale-P2
>             Fix For: 2.23.0
>
>
> The Apex runner should leverage the partitioning features of Apex for Beam 
> pipeline translation (parallel partitions, dynamic partitioning and cascading 
> unifiers etc.). Specifically for ParDo and GroupByKey (GBK partitioning will 
> also need the appropriate stream codec that will partition the stream based 
> on the encoded key).  Enabling the partitioning will also require watermarks 
> to be broadcasted on a separate Apex operator port.



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