Github user CodingCat commented on the pull request: https://github.com/apache/spark/pull/2097#issuecomment-53151295 en....that's exactly the motivation which I proposed this PR for....ContextCleaner sometimes mistakenly cleans my broadcast files in my test cases...about one month ago, I asked TD about this, we cannot find the reasonable explananation; on some day, it disappeared, recently, it's there again, so I have to close ContextCleaner in our test cases (I guess that's related to the fact that I'm using JDK7 which is not fully tested? the weird thing is that, in our 24 * 7 service, it never appear)
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