Github user pvginkel commented on the issue:
https://github.com/apache/lucenenet/pull/205
I have, but this is a problematic one. This depends on a race condition,
which is non-deterministic by definition.
The test case I created runs a few threads for a few seconds and fails when
the exception is thrown in one of the threads. Fun thing is that we're running
until some timeout and then cancelling the test. If we wouldn't the test could
theoretically run indefinitely, never hitting the race condition. However,
since we run for some time interval, it could also be that the problem is still
there, but it just wasn't hit.
I've ignored this test case because:
* It's non deterministic, so the fact that it succeeds doesn't mean that
the problem isn't there, making the test case useless;
* It prolongs running the test suite since we have to run for a non trivial
amount of time. I've set this to 5 seconds.
This all being said: the test case is there so you can try it if you'd
like. On my 8 core workstation, it fails most of the time with the `HashSet<>`
and succeeds all of the time with the `ConcurrentHashSet<>`.
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