Github user ankurdave commented on the pull request:
https://github.com/apache/spark/pull/2446#issuecomment-56087113
Awesome, thanks! I didn't know about ParallelSorter.
I submitted a PR to fix the compile error (larryxiao/spark#2). It also has
to sort by (srcId, dstId) rather than just srcId because groupEdges relies on
that. Finally, it works around a small
[bug](http://mydailyjava.blogspot.com/2013/11/cglib-missing-manual.html) in
ParallelSorter that requires you to supply explicit sorting ranges to avoid a
ClassCastException.
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