Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/1896#issuecomment-51852483
It has to do with FakeRackUtil used in that class.
I guess not all tests clean it up properly after assigning to it : which is
why host2 (or host1 depending on order) ends up being RACK_LOCAL.
In our test, we are not expecting it to be part of any rack.
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