mikemccand commented on PR #14167:
URL: https://github.com/apache/lucene/pull/14167#issuecomment-2610089955
> Frustratingly, the seeded failures do not seem to be repeatable.
Hmm that is bad ... it means there is a test bug or test infra bug (separate
from the scary bug this test is chasing!)?
Oh, maybe force `SerialMergeScheduler` to your `RandomIndexWriter`? Since
`CMS` (Lucene's default and RIW will sometimes pick that) launches threads and
we don't know how to determinize JVM's/OS's thread scheduling, that might
explain the non-reproducibility? E.g.:
```
IndexWriterConfig iwc = LuceneTestCase.newIndexWriterConfig(r, new
MockAnalyzer(r)), true, r.nextBoolean();
iwc.setMergeScheduler(new SerialMergeScheduler());
RandomIndexWriter riw = new RandomIndexWriter(random(), dir, iwc);
```
or so?
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