Mailing-List: contact java-dev-help@lucene.apache.org; run by ezmlm
Precedence: bulk
Reply-To: java-dev@lucene.apache.org
Received-SPF: pass (athena.apache.org: domain of mike.klaas@gmail.com
 designates 209.85.200.168 as permitted sender)
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=message-id:from:to:in-reply-to:content-type:content-transfer-encoding:mime-version:subject:date:references:x-mailer;
        b=ZY5/EyLQu1/QqiEaBG7n7ZktfKBTouTe1xMTKP0B1bQOJ9uuta5z8tQYslAcMIyVkvwqZJopgS1eWzXWVh8DhJVn3umkDMaYA/o9lL5LVF/4aJ+k2oEAnO4c6/FG1zjyzBrau5vqJQ4GgMlShrXZc4a+YYbd5gG6fMr7ZTOlyzc=
Message-Id: <62519E11-035B-4A5B-AADE-6407CD7ADC96@gmail.com>
From: Mike Klaas <mike.klaas@gmail.com>
To: java-dev@lucene.apache.org
In-Reply-To: <200805011903.43275.lucene@nitwit.de>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
Content-Transfer-Encoding: 7bit
Mime-Version: 1.0 (Apple Message framework v919.2)
Subject: Re: LazyRAMDirectory
Date: Thu, 1 May 2008 14:53:14 -0700
References: <200805011903.43275.lucene@nitwit.de>

On 1-May-08, at 10:03 AM, Timo Nentwig wrote:

> Hello developers,
>
> I do have enough memory to load the index completely into RAM but  
> can't live
> with the fact that it takes multiple minutes to do so.
>
> So I can up with the idea of implementing a RAMDirectory proxy that  
> does the
> Directory.copy() asyncronously and while not finished delegating to  
> the
> FSDirectory.
>
> Does somebody already have done this or is this for some reason a  
> bad idea to
> do?

Is it a bad idea?  Well, there is a version of Directory that lazily- 
loads only needed parts of the index in memory, eventually storing the  
whole index there given enough ram.  It's called FSDirectory :)

Depending on how tightly your RAMDirectory fits in memory, you might  
find that the FSD gets memory-starved before the RAMDir has finished  
loading and suffer horrible performance as a consequence.

-Mike

---------------------------------------------------------------------
To unsubscribe, e-mail: java-dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-dev-help@lucene.apache.org