Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/1186#issuecomment-50972094
Hey @douglaz - I looked around at the AWS API and it appears that this is a
somewhat generic API (i.e. it doesn't necessarily have to contain a script).
```
UserData - string - Optional - Optional data, specific to a userâs
application, to provide in the launch request. All instances that collectively
comprise the launch request have access to this data. User data is never
returned through API responses.
```
http://docs.aws.amazon.com/AWSSDKforPHP/latest/index.html#m=AmazonEC2/request_spot_instances
I couldn't find much more information than this online. Is this something
where a few specific AMI types interpret this as a script and execute it on
start-up?
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