mesos/spark-ec2 — pull request #57 by rxin (2014-06-13 06:54:47+00:00)
Title: Replace xfs with ext4 for r3 SSD instances

In my experience xfs had a lot of problems during shuffle heavy workloads. All the problems I observed went away when I replaced the file system with ext4. We might be able to tune xfs to be better; however, ext4 just provides better out of the box behavior here without us having to dig deeper into file system tuning.