apache/spark — pull request #2244 by pwendell (2014-09-03 03:35:17+00:00)
Title: SPARK-3358: [EC2] Switch back to HVM instances for m3.X.

During regression tests of Spark 1.1 we discovered perf issues with
PVM instances when running PySpark. This reverts a change added in #1156
which changed the default type for m3 instances to PVM.