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From Mark Miller <>
Subject Re: Solr Cache
Date Wed, 23 Aug 2006 10:36:17 GMT
Thanks Hoss. I apologize for being  slightly off topic.  Instead of 
using  Solr, I am trying to steal from it, and so Lucene was still 
mostly what was on my mind :) I posted too soon as well because I 
finally found the wiki page on caching at Solr's site.

I have just implemented the "warm a new searcher" trick in my Lucene 
app, and I am now looking into the best way to add caching--if caching 
turns out to be beneficial to the app I am making. Of course I might 
just drop all of this and use Solr, but it seems to be a nice learning 
experience to go through all of this using just Lucene. Thanks for the 
high level answers though...exactly what I was looking for.

- Mark
> : It looks like Solr does not use a simple cached queryfilter as a query
> : cache. Why is this? Is a cache queryfilter not efficient enough? Is this
> : alternate method just so you can easily load the cache from an old
> : Searcher to a new Searcher? Any info appreciated.
> This would probably be better addressed on the solr-user mailing list --
> please post any followup question there.
> I'll through out some high level answers though in case any one else is
> interested...
>  * there's nothign to stop a solr request handler from using
>    QueryFilter's if they want (i have and do)
>  * Solr has several types of caches for different things
>  * the "filterCache" has the most direct conceptual mapping to how a
>    QueryFilter and CachedWrapperFilter work.  The big benefits it has are:
>     - the DocSet API allows for more memory efficient representations of
>       small sets of documents then just a BitSet
>     - it can be configured with a size and replacement strategy
>       (CachedWrapperFilter is more for things that can live "forever"
>       relative the IndexReader)
> -Hoss
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