lucene-solr-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Otis Gospodnetic <otis.gospodne...@gmail.com>
Subject Re: More Like This and Caching
Date Fri, 10 May 2013 00:14:50 GMT
This is correct,  doc cache for previously read docs regardless of which
query read them and query cache for repeat query. Plus OS cache for actual
index files.

Otis
Solr & ElasticSearch Support
http://sematext.com/
On May 9, 2013 2:32 PM, "Jason Hellman" <jhellman@innoventsolutions.com>
wrote:

> Purely from empirical observation, both the DocumentCache and
> QueryResultCache are being populated and reused in reloads of a simple MLT
> search.  You can see in the cache inserts how much extra-curricular
> activity is happening to populate the MLT data by how many inserts and
> lookups occur on the first load.
>
> (lifted right out of the MLT wiki http://wiki.apache.org/solr/MoreLikeThis)
>
>
> http://localhost:8983/solr/select?q=apache&mlt=true&mlt.fl=manu,cat&mlt.mindf=1&mlt.mintf=1&fl=id,score
>
> There is no activity in the filterCache, fieldCache, or fieldValueCache -
> and that makes plenty of sense.
>
> On May 9, 2013, at 11:12 AM, David Parks <davidparks21@yahoo.com> wrote:
>
> > I'm not the expert here, but perhaps what you're noticing is actually the
> > OS's disk cache. The actual solr index isn't cached by solr, but as you
> read
> > the blocks off disk the OS disk cache probably did cache those blocks for
> > you. On the 2nd run the index blocks were read out of memory.
> >
> > There was a very extensive discussion on this list not long back titled:
> > "Re: SolrCloud loadbalancing, replication, and failover" look that
> thread up
> > and you'll get a lot of in-depth on the topic.
> >
> > David
> >
> >
> > -----Original Message-----
> > From: Giammarco Schisani [mailto:giammarco@schisani.com]
> > Sent: Thursday, May 09, 2013 2:59 PM
> > To: solr-user@lucene.apache.org
> > Subject: More Like This and Caching
> >
> > Hi all,
> >
> > Could anybody explain which Solr cache (e.g. queryResultCache,
> > documentCache, fieldCache, etc.) can be used by the More Like This
> handler?
> >
> > One of my colleagues had previously suggested that the More Like This
> > handler does not take advantage of any of the Solr caches.
> >
> > However, if I issue two identical MLT requests to the same Solr instance,
> > the second request will execute much faster than the first request (for
> > example, the first request will execute in 200ms and the second request
> will
> > execute in 20ms). This makes me believe that at least one of the Solr
> caches
> > is being used by the More Like This handler.
> >
> > I think the "documentCache" is the cache that is most likely being used,
> but
> > would you be able to confirm?
> >
> > As information, I am currently using Solr version 3.6.1.
> >
> > Kind regards,
> > Giammarco Schisani
> >
>
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message