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From "Robert Bradshaw (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-184) Using Merging Windows and/or Triggers without a downstream aggregation should fail
Date Thu, 27 Oct 2016 16:12:03 GMT

    [ https://issues.apache.org/jira/browse/BEAM-184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15612368#comment-15612368
] 

Robert Bradshaw commented on BEAM-184:
--------------------------------------

This seems more like it should be a warning than an error, though it's forwards compatible
to make it an error that can be relaxed later. 

> 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
>
> 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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