Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/20706
> I do not know whether this change only affects the test cases.
I do, because I checked. The tests were using the API incorrectly,
actually, and could leave garbage outside the temp dirs, polluting the source
tree. That wrong usage pattern was actually the thing that made tests be
affected by the change. No code outside of tests uses the API in that way.
And adding a conf would kinda defeat the purpose of using the existing JRE
API, since it would require maintaining the old conf.
In summary, not all behavior changes are equal, especially if you're
talking about an internal API.
That being said, I'm going to run some tests with
YARN+Kerneros+ShuffleService to make sure things are the same - I think I may
need to adjust something in `DiskBlockManager`.
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