Michael McCandless created LUCENE-4954:
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Summary: LuceneTestFramework fails to catch temporary FieldCache
insanity
Key: LUCENE-4954
URL: https://issues.apache.org/jira/browse/LUCENE-4954
Project: Lucene - Core
Issue Type: Bug
Reporter: Michael McCandless
Fix For: 5.0, 4.4
Ever since we added readerClosedListeners to evict FieldCache entries, LTC will
no longer detect insanity as long as the test closes all readers leading to
insanity ...
So this has weakened our testing of catching accidental insanity producing code.
To fix this I think we could tap into FieldCacheImpl.setInfoStream ... and
ensure the test didn't print anything to it.
This was a spinoff from LUCENE-4953, where that test
(AllGroupHeadsCollectorTest) is always producing insanity, but then because of
a bug the FC eviction wasn't working right, and LTC then detected the insanity.
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