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From robert engels <reng...@ix.netcom.com>
Subject Re: lucene indexing and merge process
Date Thu, 18 Oct 2007 17:21:51 GMT
As a follow-up, it seemed that in the past much of Lucene relied on  
the OS disk cache for performance.  The FieldCache seems to go  
against this, probably because of the parsing involved.

The 'fixed-length' key file would not need extensive parsing, and  
thus seems more suitable for OS level caching.

Robert

On Oct 18, 2007, at 11:57 AM, Doug Cutting wrote:

> robert engels wrote:
>> seek (segment doc no * keylength), read (byte[keylength])
>> This would be very efficient when using external document storage.
>
> A seek per document in hits is to be avoided.  This is similar to  
> the way field data is stored, which is, as mentioned in the first  
> message "very slow if recall set is large".
>
> See the "Stored Fields" section of:
>
> http://lucene.apache.org/java/docs/fileformats.html#Fields
>
> Doug
>
>
>
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