Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1899#issuecomment-51867038
Why is it useful to have the cluster name be different from the security
group prefix? If I want to re-use an existing security group, I can just name
my cluster after that security group. The cluster name only seems to be used
to name the security groups, instance requests, and instances.
What would happen if I launched a cluster with a name that's different from
its security group, then attempted to run spark-ec2 commands by passing only
the actual security group name as the cluster name? In this case, I think the
instances would still be named with the cluster name, which might cause
problems since the script would be expecting to find ones named after the
security group.
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