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From "Kenneth Knowles (JIRA)" <>
Subject [jira] [Commented] (BEAM-1316) DoFn#startBundle should not be able to output
Date Thu, 23 Mar 2017 05:42:41 GMT


Kenneth Knowles commented on BEAM-1316:

I'm going to abuse existing issues to describe this:

1. {{@StartBundle}} should not be able to output
2. New {{DoFn}} should have a way to output to a specific window
3. {{@FinishBundle}} should be required to specify the window

Otherwise we have a bunch of quasi-dupes.

> DoFn#startBundle should not be able to output
> ---------------------------------------------
>                 Key: BEAM-1316
>                 URL:
>             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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