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https://issues.apache.org/jira/browse/BEAM-184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15903673#comment-15903673
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Kenneth Knowles commented on BEAM-184:
--------------------------------------
I think with pipeline surgery in Java we are at a point where we can do this
sort of validation effectively across runners. I will put it on the burn-down
and choose an arbitrary owner, with the understanding that we have bigger
priorities.
> Using Merging Windows and/or Triggers without a downstream aggregation should
> fail
> ----------------------------------------------------------------------------------
>
> Key: BEAM-184
> URL: https://issues.apache.org/jira/browse/BEAM-184
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Ben Chambers
> Priority: Minor
> Labels: backward-incompatible
> Fix For: First stable release
>
>
> Both merging windows (such as sessions) and triggering only actually happen
> at an aggregation (GroupByKey). We should produce errors in any of these
> cases:
> 1. Merging window used without a downstream GroupByKey
> 2. Triggers used without a downstream GroupByKey
> 3. Window inspected after inserting a merging window and before the GroupByKey
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