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https://issues.apache.org/jira/browse/BEAM-7025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17137316#comment-17137316
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Beam JIRA Bot commented on BEAM-7025:
-------------------------------------
This issue was marked "stale-P2" and has not received a public comment in 14
days. It is now automatically moved to P3. If you are still affected by it, you
can comment and move it back to P2.
> Python pipelines should not be able to use output tags that are not defined
> in with_outputs.
> --------------------------------------------------------------------------------------------
>
> Key: BEAM-7025
> URL: https://issues.apache.org/jira/browse/BEAM-7025
> Project: Beam
> Issue Type: New Feature
> Components: sdk-py-core
> Reporter: Alex Amato
> Priority: P3
>
> This is an indication of a user misconfiguring a beam pipeline.
> This is because its not possible to get a handle to use the produced
> pcollection for that output tag, if .with_outputs is not used. So this should
> be disallowed entirely, a run time exception should be thrown.
> Note:
> The bundle descriptor knows which tags are available for each step. So at
> runtime it can be detected. But we need to be careful to not test it on every
> element, for performance purposes
>
> i suspect its possible to detect it statically, but may require collecting
> more information
>
> But there should be some code path already collects the elements for the
> bundle into the different tags when output at that point, at the end of
> bundle execution we can check for it which would be cheap
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