[ https://issues.apache.org/jira/browse/LUCENENET-106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12557244#action_12557244 ] 

mdissel edited comment on LUCENENET-106 at 1/9/08 4:31 AM:
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I got another serious memory leak. This is the result from DebugDiag tool. The patch in this issue doesn't solve this one.. Anyone solved this already?

(doing a seach with a custom sort)

Is this line the problem in the FieldCacheImpl?
class Cache.Get
//
innerCache = new System.Collections.Hashtable(); // shouldn't this be WeakHashtable()???
//

[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldCacheImpl/AnonymousClassCache3.CreateValue(Class Lucene.Net.Index.IndexReader,Object)      0xC920F4 
[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldCacheImpl/Cache.Get(Class Lucene.Net.Index.IndexReader,Object)       
[DEFAULT] [hasThis] Class Lucene.Net.Search.StringIndex Lucene.Net.Search.FieldCacheImpl.GetStringIndex(Class Lucene.Net.Index.IndexReader,String)       
[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldCacheImpl/AnonymousClassCache4.CreateValue(Class Lucene.Net.Index.IndexReader,Object)       
[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldCacheImpl/Cache.Get(Class Lucene.Net.Index.IndexReader,Object)       
[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldCacheImpl.GetAuto(Class Lucene.Net.Index.IndexReader,String)       
[DEFAULT] Class Lucene.Net.Search.ScoreDocComparator Lucene.Net.Search.FieldSortedHitQueue.ComparatorAuto(Class Lucene.Net.Index.IndexReader,String)       
[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldSortedHitQueue/AnonymousClassCache.CreateValue(Class Lucene.Net.Index.IndexReader,Object)      [DEFAULT] Class Lucene.Net.Search.ScoreDocComparator Lucene.Net.Search.FieldSortedHitQueue.ComparatorAuto(Class Lucene.Net.Index.IndexReader,String) 
[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldCacheImpl/Cache.Get(Class Lucene.Net.Index.IndexReader,Object)       
[DEFAULT] Class Lucene.Net.Search.ScoreDocComparator Lucene.Net.Search.FieldSortedHitQueue.GetCachedComparator(Class Lucene.Net.Index.IndexReader,String,I4,Class System.Globalization.CultureInfo,Class Lucene.Net.Search.SortComparatorSource)       
[DEFAULT] [hasThis] Void Lucene.Net.Search.FieldSortedHitQueue..ctor(Class Lucene.Net.Index.IndexReader,SZArray Class Lucene.Net.Search.SortField,I4)      [DEFAULT] Class Lucene.Net.Search.ScoreDocComparator Lucene.Net.Search.FieldSortedHitQueue.GetCachedComparator(Class Lucene.Net.Index.IndexReader,String,I4,Class System.Globalization.CultureInfo,Class Lucene.Net.Search.SortComparatorSource) 
[DEFAULT] [hasThis] Class Lucene.Net.Search.TopFieldDocs Lucene.Net.Search.IndexSearcher.Search(Class Lucene.Net.Search.Weight,Class Lucene.Net.Search.Filter,I4,Class Lucene.Net.Search.Sort)      [DEFAULT] [hasThis] Void Lucene.Net.Search.FieldSortedHitQueue..ctor(Class Lucene.Net.Index.IndexReader,SZArray Class Lucene.Net.Search.SortField,I4) 
[DEFAULT] [hasThis] Class Lucene.Net.Search.TopFieldDocs Lucene.Net.Search.Searcher.Search(Class Lucene.Net.Search.Query,Class Lucene.Net.Search.Filter,I4,Class Lucene.Net.Search.Sort) 


      was (Author: mdissel):
    I got another serious memory leak. This is the result from DebugDiag tool. The attached patched doesn't solve this one.. Anyone solved this already?

Is this line the problem in the FieldCacheImpl?
class Cache.Get
//
innerCache = new System.Collections.Hashtable(); // shouldn't this be WeakHashtable()???
//

[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldCacheImpl/AnonymousClassCache3.CreateValue(Class Lucene.Net.Index.IndexReader,Object)      0xC920F4 
[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldCacheImpl/Cache.Get(Class Lucene.Net.Index.IndexReader,Object)       
[DEFAULT] [hasThis] Class Lucene.Net.Search.StringIndex Lucene.Net.Search.FieldCacheImpl.GetStringIndex(Class Lucene.Net.Index.IndexReader,String)       
[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldCacheImpl/AnonymousClassCache4.CreateValue(Class Lucene.Net.Index.IndexReader,Object)       
[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldCacheImpl/Cache.Get(Class Lucene.Net.Index.IndexReader,Object)       
[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldCacheImpl.GetAuto(Class Lucene.Net.Index.IndexReader,String)       
[DEFAULT] Class Lucene.Net.Search.ScoreDocComparator Lucene.Net.Search.FieldSortedHitQueue.ComparatorAuto(Class Lucene.Net.Index.IndexReader,String)       
[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldSortedHitQueue/AnonymousClassCache.CreateValue(Class Lucene.Net.Index.IndexReader,Object)      [DEFAULT] Class Lucene.Net.Search.ScoreDocComparator Lucene.Net.Search.FieldSortedHitQueue.ComparatorAuto(Class Lucene.Net.Index.IndexReader,String) 
[DEFAULT] [hasThis] Object Lucene.Net.Search.FieldCacheImpl/Cache.Get(Class Lucene.Net.Index.IndexReader,Object)       
[DEFAULT] Class Lucene.Net.Search.ScoreDocComparator Lucene.Net.Search.FieldSortedHitQueue.GetCachedComparator(Class Lucene.Net.Index.IndexReader,String,I4,Class System.Globalization.CultureInfo,Class Lucene.Net.Search.SortComparatorSource)       
[DEFAULT] [hasThis] Void Lucene.Net.Search.FieldSortedHitQueue..ctor(Class Lucene.Net.Index.IndexReader,SZArray Class Lucene.Net.Search.SortField,I4)      [DEFAULT] Class Lucene.Net.Search.ScoreDocComparator Lucene.Net.Search.FieldSortedHitQueue.GetCachedComparator(Class Lucene.Net.Index.IndexReader,String,I4,Class System.Globalization.CultureInfo,Class Lucene.Net.Search.SortComparatorSource) 
[DEFAULT] [hasThis] Class Lucene.Net.Search.TopFieldDocs Lucene.Net.Search.IndexSearcher.Search(Class Lucene.Net.Search.Weight,Class Lucene.Net.Search.Filter,I4,Class Lucene.Net.Search.Sort)      [DEFAULT] [hasThis] Void Lucene.Net.Search.FieldSortedHitQueue..ctor(Class Lucene.Net.Index.IndexReader,SZArray Class Lucene.Net.Search.SortField,I4) 
[DEFAULT] [hasThis] Class Lucene.Net.Search.TopFieldDocs Lucene.Net.Search.Searcher.Search(Class Lucene.Net.Search.Query,Class Lucene.Net.Search.Filter,I4,Class Lucene.Net.Search.Sort) 

  
> Lucene.NET (Revision: 603121) is leaking memory
> -----------------------------------------------
>
>                 Key: LUCENENET-106
>                 URL: https://issues.apache.org/jira/browse/LUCENENET-106
>             Project: Lucene.Net
>          Issue Type: Bug
>         Environment: .NET 2.0
>            Reporter: Anton K.
>            Priority: Critical
>         Attachments: DIGY-FieldCacheImpl.patch, Digy.rar, luceneSrc_memUsage.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.
> http://www.gossamer-threads.com/lists/lucene/java-user/55681
> 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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