[jira] Commented: (LUCENENET-106) Lucene.NET (Revision: 603121) is leaking memory

["Ross Faneuf (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENENET-106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12554833 ] 

Ross Faneuf commented on LUCENENET-106:
---------------------------------------

I also ran into this bug. The translation of the Java WeakHashMap to .Net results in one of the few ways I've encountered to completely defeat the CRL garbage collector. My solution was to replace the use of the thread data cache with an instance variable, since the effect of the .Net code was to re-cache the information for every instance.

Our code closes a cached IndexSearcher and reacquires a new instance whenever the index version changes. This bug resulted in a steady memory leak which could bring down a service process after running for a relatively few days.

> 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
>
> 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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