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Subject: SV: Date first best practises
Date: Sun, 21 May 2006 18:12:56 +0200
Message-ID: <8834A84C87A2C148AD46921BB8BFC97C33B5E1@S1SE1MAIL.emea1.ad.group>
Thread-Topic: Date first best practises
Thread-Index: AcZ87a4dp40TLjlKS82NMrBhAoEm3AAA73e/
From: "Marcus Falck" <marcus.falck@observer.se>
To: <java-user@lucene.apache.org>

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Thanks.
I preffer sorting. But I'm afraid that it won't be enough.=20
How long time do you think it will take to rebuild the caches?
If I use a sort on the datefield and perform a query (with that sort) =
will it always rebuild the whole cache or
just the cache for the actual hits?
=20
/
Marcus

________________________________

Fr=E5n: Erik Hatcher [mailto:erik@ehatchersolutions.com]
Skickat: s=F6 2006-05-21 17:45
Till: java-user@lucene.apache.org
=C4mne: Re: Date first best practises


On May 21, 2006, at 11:31 AM, Marcus Falck wrote:
> I will use Lucene to index 200 million documents (doc size 2kb ->=20
> 20 kb).
> With the following requirements:
> IndexSearcher needs to be created atleast every 5 minute.
> The ranking/scoring/sorting will need to reply the hits ordered by=20
> date desc.
>
> Will the sorting be good enough on a machine with 4GB of RAM? Since=20
> the cache will be destroyed every time I open a new IndexSercher i=20
> need to know how long it will take to rebuild it (the index is=20
> stored on a SAN).

My hunch is that sorting will be fine, but you'll want to warm up the=20
caches before putting a new IndexSearcher into production use.  Solr=20
does this by running a configurable set of queries against an index=20
before swapping out the old IndexSearcher with a new warmed up one.

> Or do I have to change the scoring so I wont need to access the=20
> date field?
>
> If i will have to change the scoring does anybody have any tips on=20
> where to begin?

Solr's FunctionQuery (isn't it time we move this to the core of=20
Lucene?! :) might be able to help you out in this situation, but it=20
sounds like sorting is what you want to use, not scoring tweaks.

        Erik


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