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https://issues.apache.org/jira/browse/BEAM-32?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16056221#comment-16056221
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Kenneth Knowles commented on BEAM-32:
-------------------------------------
Even though anyone affected by this probably has an erroneous pipeline, it is
still backwards incompatible. I am going to close it and just go with BEAM-210
to give an option.
> 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
> Fix For: Not applicable
>
>
> 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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