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Posted to issues@spark.apache.org by "Sandy Ryza (JIRA)" <ji...@apache.org> on 2014/12/03 09:34:12 UTC

[jira] [Created] (SPARK-4716) Avoid shuffle when all-to-all operation has single input and output partition

Sandy Ryza created SPARK-4716:
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             Summary: 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


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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