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https://issues.apache.org/jira/browse/BEAM-91?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17138645#comment-17138645
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Kenneth Knowles commented on BEAM-91:
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I just linked a couple PRs that prototyped things in a small way.
> Retractions
> -----------
>
> Key: BEAM-91
> URL: https://issues.apache.org/jira/browse/BEAM-91
> Project: Beam
> Issue Type: New Feature
> Components: beam-model
> Reporter: Tyler Akidau
> Priority: P2
> Labels: stale-P2
> Original Estimate: 672h
> Remaining Estimate: 672h
>
> We still haven't added retractions to Beam, even though they're a core part
> of the model. We should document all the necessary aspects (uncombine,
> reverting DoFn output with DoOvers, sink integration, source-level
> retractions, etc), and then implement them.
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