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From "Sourabh Bajaj (JIRA)" <>
Subject [jira] [Commented] (BEAM-1316) DoFn#startBundle should not be able to output
Date Tue, 02 May 2017 18:18:04 GMT


Sourabh Bajaj commented on BEAM-1316:

[~altay] done.

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

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