Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/2393#issuecomment-55728033
@chenghao-intel For example, in `FileServerSuite`:
```
override def beforeAll() {
super.beforeAll()
tmpDir = Files.createTempDir()
tmpDir.deleteOnExit()
...
}
...
override def afterAll() {
super.afterAll()
Utils.deleteRecursively(tmpDir)
}
```
This makes a temp dir in the right place, asks the JVM to delete it on
shutdown, but also tries to delete it explicitly after the test finishes.
(Looks like `FileUtils.deleteDirectory` duplicates
`Utils.deleteRecursively`?)
I was not sure if `deleteOnExit()` works in the case of Ctrl-C, but a quick
test here suggests it does. It won't work in the case of hard failures, but
nothing will really.
The risk with `Signal` is that by trapping Ctrl-C (and this requires a
non-public Sun API anyway) you become unkillable if the handler blocks for some
reason.
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