apache/spark — pull request #1344 by nchammas (2014-07-09 14:54:30+00:00)
Title: name ec2 instances and security groups consistently

Security groups created by `spark-ec2` do not prepend “spark-“ to the
name.

Since naming the instances themselves is new to `spark-ec2`, it’s better
to change that pattern to match the existing naming pattern for the
security groups, rather than the other way around.