[jira] [Closed] (BEAM-34) Change default output timestamp for combined values to end of window

["Daniel Halperin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-34?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Halperin closed BEAM-34.
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> 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: Improvement
>          Components: beam-model
>            Reporter: Kenneth Knowles
>            Assignee: Kenneth Knowles
>              Labels: Windowing, backward-incompatible
>             Fix For: 0.1.0-incubating
>
>
> 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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