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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