Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/9980#issuecomment-160798418
@rekhajoshm You need to do profiling on big datasets. If the improvement is
not significant, then this is not the right fix. Essentially we are shuffling
many small objects `(srcId, (dstId, rating))`. I don't think the fix would be
trivial. We could probably see improvement if we switch the backend to
DataFrame/Tungsten.
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