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https://issues.apache.org/jira/browse/LUCENENET-484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397377#comment-13397377
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Luc Vanlerberghe commented on LUCENENET-484:
--------------------------------------------
TestSort.TestParallelMultiSort crashes sometimes because of a race condition in
FieldCacheImpl.GetCacheEntries.
It's only called in DEBUG during tests while calling
FieldCacheSanityChecker.CheckSanity.
In TestSort.TestParallelMultiSort this can happen on multiple threads
simultaneously.
I checked the java version and it has the same problem in version 3.0.3 but was
corrected later in rev. 912330:
"uschindler 21/02/2010 12:16:42 LUCENE-2273: Fixed bug in
FieldCacheImpl.getCacheEntries() that used WeakHashMap incorrectly and lead to
ConcurrentModificationException"
The patch also correct FieldCachImpl.PurgeAllCaches() and .Purge(IndexReader r)
The first is also only called in test, but the second one is called in the
DoClose() methods on several Reader implementations and could cause trouble if
left unpatched (though near to impossible to write a test for, IMHO)
I'll post the translated patch in a minute
> Some possibly major tests intermittently fail
> ----------------------------------------------
>
> Key: LUCENENET-484
> URL: https://issues.apache.org/jira/browse/LUCENENET-484
> Project: Lucene.Net
> Issue Type: Bug
> Components: Lucene.Net Core, Lucene.Net Test
> Affects Versions: Lucene.Net 3.0.3
> Environment: All
> Reporter: Christopher Currens
> Fix For: Lucene.Net 3.0.3
>
> Attachments: Lucenenet-484-NativeFSLockFactory.patch,
> Lucenenet-484-WeakDictionary.patch, Lucenenet-484-WeakDictionaryTests.patch
>
>
> These tests will fail intermittently in Debug or Release mode, in the core
> test suite:
> # -Lucene.Net.Index:-
> #- -TestConcurrentMergeScheduler.TestFlushExceptions-
> # Lucene.Net.Store:
> #- TestLockFactory.TestStressLocks
> # Lucene.Net.Search:
> #- TestSort.TestParallelMultiSort
> # -Lucene.Net.Util:-
> #- -TestFieldCacheSanityChecker.TestInsanity1-
> #- -TestFieldCacheSanityChecker.TestInsanity2-
> #- -(It's possible all of the insanity tests fail at one point or another)-
> # -Lucene.Net.Support-
> #- -TestWeakHashTableMultiThreadAccess.Test-
> TestWeakHashTableMultiThreadAccess should be fine to remove along with the
> WeakHashTable in the Support namespace, since it's been replaced with
> WeakDictionary.
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