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From "Daniel Halperin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (BEAM-1316) DoFn#startBundle should not be able to output
Date Thu, 04 May 2017 18:04:04 GMT

     [ https://issues.apache.org/jira/browse/BEAM-1316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Halperin updated BEAM-1316:
----------------------------------
    Labels: backward-incompatible  (was: )

> 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
>            Assignee: Thomas Groh
>              Labels: backward-incompatible
>             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
things.



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