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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-2333) Rehydrate Pipeline from Runner API proto
Date Sat, 20 May 2017 04:53:04 GMT

    [ https://issues.apache.org/jira/browse/BEAM-2333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16018322#comment-16018322
] 

ASF GitHub Bot commented on BEAM-2333:
--------------------------------------

GitHub user kennknowles opened a pull request:

    https://github.com/apache/beam/pull/3195

    [BEAM-2333] Key DirectRunner translators off URN

    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).
    
    ---
    
    R: @tgroh 
    
    This is a bit of a work in progress, mostly to flesh out what is needed for a runner to
work with a to-proto-and-back pipeline, and to get early feedback since you know the direct
runner as well as pipeline surgery and transform payload translators.
    
     - `RawPTransform` is the thing that will be built from a proto. It just has a URN and
payload, but we might add conveniences like `RawParDo` that exposes all the expected methods.
(naming TBD)
     - The translator can just give a URN without actually translating, since that might be
common and shared between pre-proto and post-proto transforms. Previously the only access
to a URN was via a full translation.
     - The direct runner keys its evaluators on URNs. Later, they should work only with post-proto
stuff, or otherwise be agnostic as to whether the pipeline is pre/post proto. Even later,
the overrides should be similarly ported.
    
    TODO for this PR is to register the translators for shared bits like `SplittableDoFn`
and then work out any kinks.

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

    $ git pull https://github.com/kennknowles/beam DirectRunner-URNs

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

    https://github.com/apache/beam/pull/3195.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 #3195
    
----
commit 9ff0440506f87981757bd3c005aa830606257e4a
Author: Kenneth Knowles <klk@google.com>
Date:   2017-05-20T03:54:36Z

    Centralize primitive URNs in PTransforms class

commit a472eac9abb02f8c2f3ebd6f3abe6920c6a5ae55
Author: Kenneth Knowles <klk@google.com>
Date:   2017-05-20T03:55:25Z

    Allow getting URN for class of transform via translator

commit d169d5a360d2663a2838766d2ce6ebda06287f37
Author: Kenneth Knowles <klk@google.com>
Date:   2017-05-20T04:28:19Z

    Add RawPTransform, which can just vend its URN and payload
    
    This is the type that will be returned when a pipeline is deserialized.
    This also is convenient for direct runner overrides which do not really
    merit translator registrations, yet URNs need to be known in order to
    key the evaluator registry off URN.

commit d45f70c83ced492d698229682e9bf909f5c02b8d
Author: Kenneth Knowles <klk@google.com>
Date:   2017-05-20T04:35:43Z

    Make SdkComponents public for TransformPayloadTranslator

commit ffb1ba2c350812ef00f49988e9e50e0921767319
Author: Kenneth Knowles <klk@google.com>
Date:   2017-05-20T03:53:32Z

    Use URNs in DirectRunner evaluator registry

----


> Rehydrate Pipeline from Runner API proto
> ----------------------------------------
>
>                 Key: BEAM-2333
>                 URL: https://issues.apache.org/jira/browse/BEAM-2333
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-core
>            Reporter: Kenneth Knowles
>            Assignee: Kenneth Knowles
>




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