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https://issues.apache.org/jira/browse/BEAM-1316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15993732#comment-15993732
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ASF GitHub Bot commented on BEAM-1316:
--------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/beam/pull/2836
> DoFn#startBundle should not be able to output
> ---------------------------------------------
>
> Key: BEAM-1316
> URL: https://issues.apache.org/jira/browse/BEAM-1316
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Thomas Groh
> Assignee: Thomas Groh
> Fix For: First stable release
>
>
> While within startBundle and finishBundle, the window in which elements are
> output is not generally defined. Elements must always be output from within a
> windowed context, or the {{WindowFn}} used by the {{PCollection}} may not
> operate appropriately.
> startBundle and finishBundle are suitable for operational duties, similarly
> to {{setup}} and {{teardown}}, but within the scope of some collection of
> input elements. This includes actions such as clearing field state within a
> DoFn and ensuring all live RPCs complete successfully before committing
> inputs.
> Sometimes it might be reasonable to output from {{@FinishBundle}} but it is
> hard to imagine a situation where output from {{@StartBundle}} is useful in a
> way that doesn't seriously abuse things.
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