Github user nchammas commented on the pull request:
https://github.com/apache/spark/pull/4162#issuecomment-72088000
OK, I think we're almost there. One final suggestion I'd make it to move
these checks on the identity file to the [input parameter validation
area](https://github.com/Liuchang0812/spark/blob/ec2-script/ec2/spark_ec2.py#L1006),
since they also apply when people are logging into a cluster.
So basically, if the `identity_file` option is specified, we check upfront
that it exists and has the right permissions. Then, no matter where its used --
launching, logging in, or other -- we know that it is valid.
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