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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-647) Fault-tolerant sideInputs via Broadcast variables
Date Thu, 15 Dec 2016 17:51:59 GMT

    [ https://issues.apache.org/jira/browse/BEAM-647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15752015#comment-15752015
] 

ASF GitHub Bot commented on BEAM-647:
-------------------------------------

GitHub user kobisalant opened a pull request:

    https://github.com/apache/incubator-beam/pull/1624

    [BEAM-647] Fault-tolerant sideInputs via Broadcast variables

    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
           number, if there is one.
     - [ ] If this contribution is large, please file an Apache
           [Individual Contributor License Agreement](https://www.apache.org/licenses/icla.txt).
    
    ---
    


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

    $ git pull https://github.com/kobisalant/incubator-beam BEAM-647-Fault-tolerant-sideInputs

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

    https://github.com/apache/incubator-beam/pull/1624.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 #1624
    
----
commit 228c613c70c4edf1b01294a487d49f0a5492136e
Author: ksalant <ksalant@payapal.com>
Date:   2016-12-15T17:42:47Z

    [BEAM-647] Fault-tolerant sideInputs via Broadcast variables

----


> Fault-tolerant sideInputs via Broadcast variables
> -------------------------------------------------
>
>                 Key: BEAM-647
>                 URL: https://issues.apache.org/jira/browse/BEAM-647
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-spark
>            Reporter: Amit Sela
>            Assignee: Kobi Salant
>
> Following https://github.com/apache/incubator-beam/pull/909 which enables checkpointing
to recover from failures, sideInputs (being implemented by broadcast variables) should be
handled in a specific manner as described here: http://spark.apache.org/docs/1.6.2/streaming-programming-guide.html#accumulators-and-broadcast-variables.
> This is a bit more complicated than Aggregators (via Accumulators) as they are implemented
using a single "aggregating"  Accumulator, while a pipeline may contain multiple sideInputs.



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