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https://issues.apache.org/jira/browse/BEAM-1461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15863990#comment-15863990
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ASF GitHub Bot commented on BEAM-1461:
--------------------------------------

GitHub user tgroh opened a pull request:

    https://github.com/apache/beam/pull/1993

    [BEAM-1461] Make PrepareForProcessing Final, Deprecated

    Be sure to do all of the following to help us incorporate your contribution
    quickly and easily:
    
     - [ ] Make sure the PR title is formatted like:
       `[BEAM-<Jira issue #>] Description of pull request`
     - [ ] Make sure tests pass via `mvn clean verify`. (Even better, enable
           Travis-CI on your fork and ensure the whole test matrix passes).
     - [ ] Replace `<Jira issue #>` in the title with the actual Jira issue
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     - [ ] If this contribution is large, please file an Apache
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    ---
    This is only used by aggregators; Users should use @Setup or
    @StartBundle instead.
    
    Aggregators are set to be removed in 
[BEAM-775](https://issues.apache.org/jira/browse/BEAM-775)


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/tgroh/beam prepare_for_processing

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/beam/pull/1993.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1993
    
----
commit fda5f1a39a9214d7dc9cc6566c01715f367493b1
Author: Thomas Groh <[email protected]>
Date:   2017-02-13T17:03:32Z

    Make PrepareForProcessing Final, Deprecated
    
    This is only used by aggregators; Users should use @Setup or
    @StartBundle instead.

----


> 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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