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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