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From "Nestel, Frank IZ/HZA-IOL" <>
Subject RE: IndexSearcher hanging on to old index files in Windows
Date Thu, 28 Apr 2005 23:31:24 GMT
Maybe it is .NET specific?! We use a very similar
Szenario with Java under Windows and the Server is
now running for 40 day since we launched it productively.
No problem at all! We have two index directories between
which we switch back and forth though?


>-----Original Message-----
>From: Monsur Hossain [] 
>Sent: Friday, April 29, 2005 12:11 AM
>Subject: IndexSearcher hanging on to old index files in Windows
>Hi all.  I'm running Lucene.NET in a Windows/ASP.NET 
>environment.  We are searching a 300meg index in a web 
>environment, where the IndexSearcher is cached.  Every 10-30 
>minutes, a separate process updates the index.  When ASP.NET's 
>cache detects a changed index, it drops the current 
>IndexSearcher (which the Garbage collector takes care of in 
>the future [1]) and creates a new one. 
>Now, while the index is being updated, the current 
>IndexSearcher in cache holds a reference to the old index 
>files.  Therefore, the IndexWriter can't delete them, and they 
>sit around in the folder, continuing to grow.  Since the 
>IndexSearcher is left to the GC, there's no guarantee of when 
>the files will be released.  
>I was considering such previously mentioned systems as 
>reference counting [2] and swapping between two indexes [3].  
>But in both these cases, I don't think I'm ever guaranteed 
>that an old IndexSearcher will have released its grasp on the 
>old files in time to delete them.  
>Anyway, I'd like to hear if others are dealing with this issue.
>Also, I'm curious, is this a Windows specific issue; I haven't 
>seen any mention of this on UNIX?
>[3] I can't find a link to it, but it was suggested by George 
>Aroush in a previous thread of mine.
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