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From Mike Klaas <>
Subject Re: LazyRAMDirectory
Date Thu, 01 May 2008 21:53:14 GMT
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.


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