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https://issues.apache.org/jira/browse/BEAM-4604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16518836#comment-16518836
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Kenneth Knowles commented on BEAM-4604:
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[~bushkovsky] the two have very different mechanisms. Can you say more about
what you are trying to do? If you think triggers are a good fit, then you
probably don't need GroupIntoBatches, but I'd like to make sure and find out
more.
> Support Triggers for "GroupIntoBatches" Transform
> -------------------------------------------------
>
> Key: BEAM-4604
> URL: https://issues.apache.org/jira/browse/BEAM-4604
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Oleksandr Bushkovskyi
> Assignee: Kenneth Knowles
> Priority: Major
>
> I think it makes sense to implement triggering support for "GroupIntoBatches"
> transform.
> I've spent quite a long time trying to understand why my triggering behavior
> doesn't work with "GroupIntoBatches".
> This transform has an exactly same signature and similar naming as
> "GroupByKey" transform. It's confusing that this two similar from outer view
> transforms works differently with triggers.
> At least it should be clearly documented with "GroupIntoBatches" that it
> doesn't support triggers.
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