Github user yanboliang commented on the pull request:
https://github.com/apache/spark/pull/9851#issuecomment-158269437
This patch works well, but I think changing
```Scala
_tempDir = Utils.createTempDir(this.getClass.getName)
```
to
```Scala
_tempDir = Utils.createTempDir()
```
at ```beforeAll()``` may be better. It also works well and does not have an
extra unneeded level of nesting.
We don't need to distinguish different directory by class name because it
will generate different random name for each suite/class.
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