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https://issues.apache.org/jira/browse/BEAM-1461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15864604#comment-15864604
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Davor Bonaci commented on BEAM-1461:
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I think what [~tgroh] did make sense. [~tgroh], can you please expand?
> duplication with StartBundle and prepareForProcessing in DoFn
> -------------------------------------------------------------
>
> Key: BEAM-1461
> URL: https://issues.apache.org/jira/browse/BEAM-1461
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Xu Mingmin
> Assignee: Davor Bonaci
>
> There're one annotation `StartBundle`, and one public function
> `prepareForProcessing` in DoFn, which are called both before
> `ProcessElement`. It's confused which one should be implemented in a subclass.
> The call sequence seems as:
> prepareForProcessing -> StartBundle -> processElement
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