Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/1899#issuecomment-52095346
Some minor comments, but otherwise LGTM.
One thing that might be worth noting is that we did use tags while
launching clusters for AMPCamp[1] and one issue I ran into was that sometimes
the create tag command failed because of eventual consistency between the
instance being allocated and the instance being tag-able.
We might want to retry the tag operation a few times since it is the only
way to identify instances now.
[1]
https://github.com/amplab/training-scripts/blob/ampcamp4/spark_ec2.py#L342
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