Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3754#issuecomment-67785054
According to
[HADOOP-6585](https://issues.apache.org/jira/browse/HADOOP-6585), the old
behavior / usage was that `!isDir` implies `isFile`. Symlinks broke this, but
we don't use them in these tests.
I'm going to merge this into `master` and `branch-1.2` to fix the Hadoop 1
builds. Thanks!
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