mesos/spark-ec2 — pull request #53 by pwendell (2014-06-03 22:00:38+00:00)
Title: Support for r3 instance types.

Amazon's new r3 instances come without EXT3-formatted drives. This patch
adds a workaround that detects this situation and formats the drives
as ext3.

Hopefully this will be subsumed later if anyone wants to pick up
SPARK-1079.