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https://issues.apache.org/jira/browse/BEAM-1316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kenneth Knowles updated BEAM-1316:
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Summary: DoFn#startBundle should not be able to output (was:
DoFn#startBundle and #finishBundle should not be able to output)
> 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
>
> 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.
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