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https://issues.apache.org/jira/browse/BEAM-34?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kenneth Knowles resolved BEAM-34.
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Resolution: Fixed
> Change default output timestamp for combined values to end of window
> --------------------------------------------------------------------
>
> Key: BEAM-34
> URL: https://issues.apache.org/jira/browse/BEAM-34
> Project: Beam
> Issue Type: New Feature
> Components: beam-model
> Reporter: Kenneth Knowles
> Assignee: Kenneth Knowles
> Labels: Windowing
>
> Today, the output timestamp for a combined value (including iterables output
> by GroupByKey) is the earliest non-late timestamp of any element combined
> together. The user can customize this by specifying an OutputTimeFn, for
> example choosing the latest non-late timestamp, or the end of the window.
> In many respects, the end of the window is the best behaved as a default, and
> is very easy to make performant. We have deferred making this change for
> backwards compatibility; this is a good time to do so.
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