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https://issues.apache.org/jira/browse/SPARK-4716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-4716.
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Resolution: Incomplete
> Avoid shuffle when all-to-all operation has single input and output partition
> -----------------------------------------------------------------------------
>
> Key: SPARK-4716
> URL: https://issues.apache.org/jira/browse/SPARK-4716
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 1.2.0
> Reporter: Sandy Ryza
> Priority: Major
> Labels: bulk-closed
>
> I encountered an application that performs joins on a bunch of small RDDs,
> unions the results, and then performs larger aggregations across them. Many
> of these small RDDs fit in a single partition. For these operations with
> only a single partition, there's no reason to write data to disk and then
> fetch it over a socket.
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