GitHub user sryza opened a pull request:

    https://github.com/apache/spark/pull/1461

    SPARK-2553. CoGroupedRDD unnecessarily allocates a Tuple2 per dependency...

    ... per key
    
    My humble opinion is that avoiding allocations in this performance-critical 
section is worth the extra code.

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

    $ git pull https://github.com/sryza/spark sandy-spark-2553

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

    https://github.com/apache/spark/pull/1461.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 #1461
    
----
commit 7eaf7f2a18ddea7ee47aacb5c5559c278a924899
Author: Sandy Ryza <sa...@cloudera.com>
Date:   2014-07-17T08:19:48Z

    SPARK-2553. CoGroupedRDD unnecessarily allocates a Tuple2 per dependency 
per key

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