Github user mpetruska commented on the issue:
https://github.com/apache/spark/pull/19671
@jiangxb1987 : Well, I ran the `BlockManagerSuite` with `testOnly` and did
not encounter any failures, passed 10 out of 10. Then, as a benchmark, I
checked out the version without my changes and run the tests the same way, I
got the same results 10 passed out of 10.
I have these theories on the matter:
- some other change fixed the issue
- test failures only manifest when running multiple other tests in parallel
- there's some setting/hardware on my machine that makes it very unlikely
for the test to fail
So, it turns out that unfortunately I cannot validate on my machine that
removing the `Thread.sleep`s solves the flakiness issue.
Can you please try running the tests on your machine with and without the
proposed changes?
(`4bacddb602e19fcd4e1ec75a7b10bed524e6989a` vs `SPARK-22297`)
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