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From "Michael McCandless (JIRA)" <>
Subject [jira] [Commented] (SOLR-2524) Adding grouping to Solr 3x
Date Wed, 18 May 2011 20:10:48 GMT


Michael McCandless commented on SOLR-2524:

bq. I think that if the cachedCollector.isCached() returns false we should put something in
the response indication that the cache wasn't used because it hit the cache.maxSizeMB limit.
Otherwise the nobody will no whether the cache was utilized.

+1, and maybe log a warning?  Or is that going to be too much logging?

bq. When I was playing around with the cache options I noticed that searching without cache
(~350 ms) was faster then with cache (~500 ms) on a 10M index with 1711 distinct group values.
This is not what I'd expect.

That is worrisome!!  Was this a simple TermQuery?  Is it somehow possible Solr is already
caching the queries results itself...?

bq. I'm already thinking about a new collector that collects all most relevant documents of
all groups. This collector should produce something like an OpenBitSet. We can use the OpenBitSet
to create a DocSet. I think this should be implemented in a different issue.


> Adding grouping to Solr 3x
> --------------------------
>                 Key: SOLR-2524
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>    Affects Versions: 3.2
>            Reporter: Martijn van Groningen
>            Assignee: Michael McCandless
>         Attachments: SOLR-2524.patch
> Grouping was recently added to Lucene 3x. See LUCENE-1421 for more information.
> I think it would be nice if we expose this functionality also to the Solr users that
are bound to a 3.x version.
> The grouping feature added to Lucene is currently a subset of the functionality that
Solr 4.0-trunk offers. Mainly it doesn't support grouping by function / query.
> The work involved getting the grouping contrib to work on Solr 3x is acceptable. I have
it more or less running here. It supports the response format and request parameters (expect:
group.query and group.func) described in the FieldCollapse page on the Solr wiki.
> I think it would be great if this is included in the Solr 3.2 release. Many people are
using grouping as patch now and this would help them a lot. Any thoughts?

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