Github user nchammas commented on the pull request:
https://github.com/apache/spark/pull/1120#issuecomment-54850308
That's what I was thinking at first, but then I noticed under ["Before You
Start"](https://github.com/apache/spark/blob/master/docs/ec2-scripts.md#before-you-start)
there already appear to be instructions about this:
>Whenever you want to use the spark-ec2 script, set the environment
variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY to your Amazon EC2 access
key ID and secret access key. These can be obtained from the AWS homepage by
clicking Account > Security Credentials > Access Credentials.
Perhaps we just need to clarify here how these environment variables will
be used. I'm guessing the original intention _was_ to have them work as
implemented in this PR.
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