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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (BEAM-25) Add user-ready API for interacting with state
Date Tue, 22 Nov 2016 05:41:58 GMT


ASF GitHub Bot commented on BEAM-25:

GitHub user kennknowles opened a pull request:

    [BEAM-25] Temporarily reject stateful ParDo in SparkRunner (until support is added)

    Be sure to do all of the following to help us incorporate your contribution
    quickly and easily:
     - [x] Make sure the PR title is formatted like:
       `[BEAM-<Jira issue #>] Description of pull request`
     - [x] Make sure tests pass via `mvn clean verify`. (Even better, enable
           Travis-CI on your fork and ensure the whole test matrix passes).
     - [x] Replace `<Jira issue #>` in the title with the actual Jira issue
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    R: @amitsela 
    At present, the user-facing API for stateful `DoFn` is in the codebase but prevented from
use. It is `ParDo.of(...)` that rejects stateful `DoFn`. In #1399 I am removing this rejection,
so I need to add it to all runners until they support the API.
    I have also added a JUnit category so runners can exclude this from their `RunnableOnService`
test suites.

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

    $ git pull SparkRunner-state

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

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

    This closes #1409
commit 8d715689dd5283b7b180c0b9ec4e188abba140f5
Author: Kenneth Knowles <>
Date:   2016-11-21T23:41:13Z

    Add JUnit category for stateful ParDo tests

commit b0d07d74f7805ee1d30fdedf54c089790d63d898
Author: Kenneth Knowles <>
Date:   2016-11-16T05:33:13Z

    Reject stateful DoFn in SparkRunner


> Add user-ready API for interacting with state
> ---------------------------------------------
>                 Key: BEAM-25
>                 URL:
>             Project: Beam
>          Issue Type: Sub-task
>          Components: sdk-java-core
>            Reporter: Kenneth Knowles
>            Assignee: Kenneth Knowles
>              Labels: State
> Our current state API is targeted at runner implementers, not pipeline authors. As such
it has many capabilities that are not necessary nor desirable for simple use cases of stateful
ParDo (such as dynamic state tag creation). Implement a simple state intended for user access.
> (Details of our current thoughts in forthcoming design doc)

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