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https://issues.apache.org/jira/browse/SOLR-2524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035631#comment-13035631
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Michael McCandless commented on SOLR-2524:
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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.
Cool!
> Adding grouping to Solr 3x
> --------------------------
>
> Key: SOLR-2524
> URL: https://issues.apache.org/jira/browse/SOLR-2524
> 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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