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Reputation: 13050

How well does Solr scale over large number of facet values?

I'm using Solr and I want to facet over a field "group".

Since "group" is created by users, potentially there can be a huge number of values for "group".

Thanks.

Upvotes: 7

Views: 3629

Answers (2)

Lici
Lici

Reputation: 998

Don't misregard to enable cache faceting related parameters (try different cache sizes to chose the values that fit well to your system):

   <filterCache class="solr.FastLRUCache" size="4096" initialSize="4096" autowarmCount="4096"/>
<queryResultCache class="solr.LRUCache" size="5000" initialSize="5000" autowarmCount="5000"/>

Upvotes: 1

jeje
jeje

Reputation: 3221

Since 1.4, solr handles facets with a large number of values pretty well, as it uses a simple facet count by default. (facet.method is 'fc' by default).

Prior to 1.4, solr was using a filter based faceted method (enum) which is definitely faster for faceting on attribute with small number of values. This method requires one filter per facet value.

About facet.limit , think of it like as a way to navigate through the facet space (in conjunction with facet.offset), like you navigate through the result space with rows/offset. So a value of 10 ~ 50 is sensible.

As with rows/offset, and due to the nature of Solr, you can expect the performance of facet.limit/facet.offset to degrade when the offset gets bigger, but it should be perfectly fine if you stay within reasonable boundaries.

By default, solr outputs more frequent facets first.

To sum up:

  • Use Solr 1.4

  • Make sure facet.method is 'fc' (well, that's the default anyway).

  • Navigate through your facet space with facet.limit/facet.offset.

Upvotes: 7

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