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https://issues.apache.org/jira/browse/BEAM-2166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16001430#comment-16001430
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ASF GitHub Bot commented on BEAM-2166:
--------------------------------------

GitHub user robertwb opened a pull request:

    https://github.com/apache/beam/pull/2960

    [BEAM-2166] Cherry-pick #2930 onto release-2.0.0

    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`.
     - [ ] Replace `<Jira issue #>` in the title with the actual Jira issue
           number, if there is one.
     - [ ] If this contribution is large, please file an Apache
           [Individual Contributor License 
Agreement](https://www.apache.org/licenses/icla.pdf).
    
    ---


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

    $ git pull https://github.com/robertwb/incubator-beam 
coders-context-sizes-release

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

    https://github.com/apache/beam/pull/2960.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 #2960
    
----

----


> Remove Coder.Context from the public API
> ----------------------------------------
>
>                 Key: BEAM-2166
>                 URL: https://issues.apache.org/jira/browse/BEAM-2166
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core, sdk-py
>    Affects Versions: 2.0.0
>            Reporter: Robert Bradshaw
>            Assignee: Robert Bradshaw
>             Fix For: 2.0.0
>
>
> Justification: 
> * Contexts add confusion and complexity to the public API (e.g. 
> https://issues.apache.org/jira/browse/BEAM-1448)
> * Leaf (user-written) coders are nearly always nested.
> * Coders are being removed from sources, which was the initial need for 
> context.
> * It is unclear how much value, if any, this provides for internal 
> performance.
> * There may be performance (as well as simplification) gains in removing this 
> for the Fn API.
> Fully removing this distinction from the internals can be defered  until the 
> last bullet points are more completely investigated. 



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