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https://issues.apache.org/jira/browse/BEAM-1979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismaël Mejía reassigned BEAM-1979:
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Assignee: (was: Eugene Kirpichov)
> Outputting to an undeclared side output TupleTag should throw
> -------------------------------------------------------------
>
> Key: BEAM-1979
> URL: https://issues.apache.org/jira/browse/BEAM-1979
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Reporter: Eugene Kirpichov
> Priority: Major
>
> Currently some runners (perhaps all of them?..), when you output to a side
> output tag that wasn't passed to ParDo.withOutputTags, simply drop the data
> on the floor (or increase some aggregators).
> Silent data dropping is never okay, and it's never okay to output to an
> undeclared tag. So instead this should throw.
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