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https://issues.apache.org/jira/browse/BEAM-2902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luke Cwik resolved BEAM-2902.
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Fix Version/s: 2.21.0
Resolution: Fixed
Works with Dataflow runner v2
> Add user state support for ParDo.Multi for the Dataflow runner
> --------------------------------------------------------------
>
> Key: BEAM-2902
> URL: https://issues.apache.org/jira/browse/BEAM-2902
> Project: Beam
> Issue Type: Sub-task
> Components: runner-dataflow
> Reporter: Luke Cwik
> Assignee: Luke Cwik
> Priority: Minor
> Labels: portability, sickbay
> Fix For: 2.21.0
>
>
> Add support for user state in a ParDo.Multi by:
> * adding expansion/conversion logic within Dataflow service to add any needed
> GBKs to allow expansion.
> *OR*
> * Add support for expansion inside the Beam SDK once the PTransformMatcher
> exposes a way to know when the replacement is not required by checking that
> the preceding ParDos to a GBK are key preserving.
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