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From "Thomas Groh (JIRA)" <>
Subject [jira] [Created] (BEAM-1316) DoFn#startBundle and #finishBundle should not be able to output
Date Wed, 25 Jan 2017 23:00:28 GMT
Thomas Groh created BEAM-1316:

             Summary: DoFn#startBundle and #finishBundle should not be able to output
                 Key: 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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