Github user srowen commented on the issue:
https://github.com/apache/spark/pull/22641
I would vote against running tests that we think have any value randomly.
It's just the wrong way to solve problems, as much as it would be to simply run
90% of our test suites each time on the theory that eventually we'd catch bugs.
If there are, say, 3 codecs, and the point is to test whether one specified
codec overrides another, does that really need more than 1 test? is there any
reason to believe that override works/doesn't work differently for different
codecs? Or are 3 tests sufficient, one to test overriding of each?
If not, I'd say do nothing. The maximum win here is about a minute of test
time? not worth it.
Or: can these cases be parallelized within the test suite?
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