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Posted to solr-user@lucene.apache.org by Joe Ho <jk...@basistech.com> on 2014/02/26 20:55:41 UTC
CollapsingQParserPlugin is slower than standard Solr field grouping
in Solr 4.6.1
I notice that in Solr 4.6.1 CollapsingQParserPlugin is slower than standard
Solr field grouping. I have a Solr index of 10000 docs, with a signature
field which is a Solr dedup field of the doc content. Majority of the
signatures are unique.
<field name="signature" type="string" stored="true" indexed="true"
multiValued="false" />
With standard Solr field grouping,
http://localhost:4462/solr/collection1/select?q=*:*&group.ngroups=true&group=true&group.field=signature&group.main=true&rows=10000&fl=id
I get average QTime 78 after Solr warmed up.
Using CollapsingQParserPlugin,
http://localhost:4462/solr/collection1/select?q=*:*&fq={!collapse%20field=signature}&rows=10000&fl=id
I get average QTime 89.2
In fact CollapsingQParserPlugin QTime is always slower than the standard
Solr field grouping.
How can I get CollapsingQParserPlugin run faster?
Joe
Re: CollapsingQParserPlugin is slower than standard Solr field
grouping in Solr 4.6.1
Posted by Joel Bernstein <jo...@gmail.com>.
Hi Joe,
With 10,000 documents the CollapsingQParserPlugin will likely not have any
performance advantages. The CollapsingQParserPlugin will be faster then
standard grouping when you have a higher number of distinct groups and
large result sets. For the scale you are working at you will be just fine
using standard grouping.
Joel Bernstein
Search Engineer at Heliosearch
On Wed, Feb 26, 2014 at 2:55 PM, Joe Ho <jk...@basistech.com> wrote:
> I notice that in Solr 4.6.1 CollapsingQParserPlugin is slower than standard
> Solr field grouping. I have a Solr index of 10000 docs, with a signature
> field which is a Solr dedup field of the doc content. Majority of the
> signatures are unique.
>
> <field name="signature" type="string" stored="true" indexed="true"
> multiValued="false" />
>
> With standard Solr field grouping,
>
> http://localhost:4462/solr/collection1/select?q=*:*&group.ngroups=true&group=true&group.field=signature&group.main=true&rows=10000&fl=id
>
> I get average QTime 78 after Solr warmed up.
>
> Using CollapsingQParserPlugin,
>
> http://localhost:4462/solr/collection1/select?q=*:*&fq={!collapse%20field=signature}&rows=10000&fl=id
>
> I get average QTime 89.2
>
> In fact CollapsingQParserPlugin QTime is always slower than the standard
> Solr field grouping.
>
> How can I get CollapsingQParserPlugin run faster?
>
> Joe
>