[jira] [Created] (BEAM-1316) DoFn#startBundle and #finishBundle should not be able to output

["Thomas Groh (JIRA)" <ji...@apache.org>]

Thomas Groh created BEAM-1316:
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             Summary: DoFn#startBundle and #finishBundle 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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