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https://issues.apache.org/jira/browse/BEAM-32?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15995644#comment-15995644
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Kenneth Knowles commented on BEAM-32:
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[~robertwb] makes the good point that a runtime error is better than
accidentally filtering data without realizing it. But actually any user
filtering _for_ the on-time pane in discarding mode is already missing a bunch
of data. In discarding mode they need to be filtering _against_ late data, in
which case this has no impact on their pipeline.
> Consider not emitting empty ON_TIME pane unless requested
> ---------------------------------------------------------
>
> Key: BEAM-32
> URL: https://issues.apache.org/jira/browse/BEAM-32
> Project: Beam
> Issue Type: New Feature
> Components: beam-model, runner-core
> Reporter: Kenneth Knowles
> Priority: Minor
> Labels: Triggers, Windowing, backward-incompatible
>
> Today, the ReduceFnRunner sets a timers and emits an empty ON_TIME pane as
> long as the trigger allows it. This could be controlled in a manner analogous
> to the empty final pane at window expiration (also owned by the
> ReduceFnRunner).
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