apache/spark — pull request #3370 by andrewor14 (2014-11-19 19:46:58+00:00)
Title: [SPARK-4480] Avoid many small spills in external data structures (again)

I accidentally closed the PR at #3353 and can't re-open it for some reason. The changes here are identical the the ones there. I'll merge this into master and 1.2 once the tests pass.