Github user squito commented on the pull request: https://github.com/apache/spark/pull/5563#issuecomment-115322472 I left a handful of minor comments, but overall looks good. I'll defer to @tnachen on the correctness of the mesos interaction. My one concern is about testing. There aren't any tests which directly check whether the attributes are used correctly. For that matter, are there no tests with a "real" mesos cluster at all? I'm not super familiar w/ the mesos code, but I poked around a few test classes and none of them seem to use a complete mesos cluster. If that is really the case, I'd just like to hear that somebody has tried this out on a real cluster with some minimal example.
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