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From Michael McCandless <luc...@mikemccandless.com>
Subject Re: follow up of Lucene out of memory with RAMDirectory on J2EE environment
Date Sun, 14 Sep 2008 10:41:33 GMT

I just committed this, so the fix will be in 2.4.

Thanks for raising this Chris!

Mike

Chris Lu wrote:

> Just confirmed the fix for this problem is ready in patch
> LUCENE-1383<https://issues.apache.org/jira/browse/LUCENE-1383>
>
> Thanks Robert Engels for arguing with me and understand the problem  
> quickly,
> and contributed a ClosableThreadLocal class, although the problem  
> itself is
> hard to reproduce for him, and thanks Michael McCandless for fixing  
> the
> problem soooo quickly.
>
> -- 
> Chris Lu
> -------------------------
> Instant Scalable Full-Text Search On Any Database/Application
> site: http://www.dbsight.net
> demo: http://search.dbsight.com
> Lucene Database Search in 3 minutes:
> http://wiki.dbsight.com/index.php?title=Create_Lucene_Database_Search_in_3_minutes
> DBSight customer, a shopping comparison site, (anonymous per  
> request) got
> 2.6 Million Euro funding!
>
> On Wed, Sep 10, 2008 at 11:32 AM, Chris Lu <chris.lu@gmail.com> wrote:
>
>> This usually happens on J2EE environment, if you use RAMDirectory.
>> Before Lucene-1195.(svn r659602, May23,2008), if you close()  
>> RAMDirectory,
>> the resources will be released right away.
>>
>> After Lucene-1195.(svn r659602, May23,2008),If you simply close() the
>> RAMDirectory, there will be an undetermined(and uncontrollable)  
>> time before
>> the RAMDirectory resources are released.
>> So if you want to avoid it, you will need to use re-open() function  
>> instead
>> of close() and open(), according to lucene developers.
>>
>> I haven't tried the re-open approach, but instead I downgrade to  
>> the svn
>> version before the patch.
>> In the previous version, close() means close(), not a delayed  
>> close().
>>
>> Before Lucene developers are willing to fix this, I will have to  
>> manually
>> remove Lucene-1195 myself if an upgrade is needed.
>>
>> If you also want this to be fixed, you can join the ongoing  
>> discussion to
>> support it on java-dev @lucene.apache.org mailing list.
>>
>> --
>> Chris Lu
>> -------------------------
>> Instant Scalable Full-Text Search On Any Database/Application
>> site: http://www.dbsight.net
>> demo: http://search.dbsight.com
>> Lucene Database Search in 3 minutes:
>> http://wiki.dbsight.com/index.php?title=Create_Lucene_Database_Search_in_3_minutes
>> DBSight customer, a shopping comparison site, (anonymous per  
>> request) got
>> 2.6 Million Euro funding!
>>


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