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From "Tim Januario (JIRA)" <>
Subject [jira] Commented: (LUCENENET-106) Lucene.NET (Revision: 603121) is leaking memory
Date Fri, 09 Jan 2009 17:15:59 GMT


Tim Januario commented on LUCENENET-106:

1) The WeakHashTable.Exists method creates a possible NullReferenceException because you used
WeakEntries[i] As WeakEntry instead of (WeakEntry)WeakEntries[i].  This is only a warning
2) The Java WeakHashMap does not throw an execption when put() is called with a key that already
exists in the table.  It simply replaces the old value with the new value.  .NET Hashtable
does the same.  The Add method of WeakHashTable should remove the WeakEntry if the key is
found and replace it with the new value in order to stay in line instead of throwing the Exception.
3) WeakHashTableEnumarator should be WeakHashTableEnumerator
4) WeakEntry.HashCode is not used and should be removed.
5) WeakHashTable.InitialMem is not used and should be removed.

Other than that, I think this looks good.


> Lucene.NET (Revision: 603121) is leaking memory
> -----------------------------------------------
>                 Key: LUCENENET-106
>                 URL:
>             Project: Lucene.Net
>          Issue Type: Bug
>         Environment: .NET 2.0
>            Reporter: Anton K.
>            Assignee: Digy
>            Priority: Critical
>         Attachments: DIGY-FieldCacheImpl.patch, Digy.rar, luceneSrc_memUsage.patch, Paches
for v2.3.1.rar, WeakHashTable v2.patch, WeakHashTable+FieldCacheImpl.rar, WeakReferences.rar
> readerCache Hashtable field (see FieldCacheImpl.cs) never releases some hash items that
have closed IndexReader object as a key. So a lot of Term instances are never released.
> Java version of Lucene uses WeakHashMap and therefore doesn't have this problem.
> This bug can be reproduced only when Sort functionality used during search. 
> See following link for additional information.
> Steps to reproduce:
> 1)Create index
> 2) Modify index by IndexWiter; Close IndexWriter
> 3) Use IndexSearcher for searching with Sort; Close InexSearcher
> 4) Go to step 2
> You'll get OutOfMemoryException after some time of running this algorithm.

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