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https://issues.apache.org/jira/browse/BEAM-1815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15943255#comment-15943255
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ASF GitHub Bot commented on BEAM-1815:
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GitHub user amitsela opened a pull request:
https://github.com/apache/beam/pull/2334
[BEAM-1815] Avoid shuffling twice in GABW.
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---
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/amitsela/beam force-partitioner-gbk
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/beam/pull/2334.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 #2334
----
commit 6221366bac567e5dccb01af0a1dc42bbaa499c8b
Author: Amit Sela <[email protected]>
Date: 2017-03-27T12:30:03Z
Force a "default" partitioner based on Spark default parallelism to avoid
unnecessary shuffles in
the composite GBK implementation.
----
> Avoid shuffling twice in GABW
> -----------------------------
>
> Key: BEAM-1815
> URL: https://issues.apache.org/jira/browse/BEAM-1815
> Project: Beam
> Issue Type: Bug
> Components: runner-spark
> Reporter: Amit Sela
> Assignee: Amit Sela
>
> Spark runner implementation of GABW includes a "built-in" groupByKey, but
> BOBK before it already groups, so in order to avoid an unnecessary shuffle we
> need to force a {{Partitioner}} on the RDDs involved.
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