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From "Michael McCandless (JIRA)" <>
Subject [jira] [Commented] (SOLR-2564) Integrating grouping module into Solr 4.0
Date Wed, 08 Jun 2011 16:59:59 GMT


Michael McCandless commented on SOLR-2564:

I think we should decouple the "should Lucene require Java 6" (which I expect to be an.....
involved, discussion) from making progress here?

My feeling is we should still commit this.  The 16% slowdown is on a very synthetic case (MatchAllDocsQuery,
sorting by reversed docID, grouping by random int field)... unless we also see unacceptable
slowdowns in more realistic cases?  Also, net/net the user should see a speedup, typically,
since caching is enabled by default.

We should still open an issue to cutover this code back to the pollLast once we can use Java
6 code.

Another option is to allow the grouping module (separately from Lucene core) to use Java 6
code.... but even that could be "involved" :)

Yonik, how do you create the index used for this test?  Somehow you generate an int field
w/ random 1000 unique values -- do you have a client-side script you use to create random
docs in Solr?

> Integrating grouping module into Solr 4.0
> -----------------------------------------
>                 Key: SOLR-2564
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Martijn van Groningen
>            Assignee: Martijn van Groningen
>             Fix For: 4.0
>         Attachments: LUCENE-2564.patch, SOLR-2564.patch, SOLR-2564.patch, SOLR-2564.patch,
SOLR-2564.patch, SOLR-2564.patch
> Since work on grouping module is going well. I think it is time to wire this up in Solr.
> Besides the current grouping features Solr provides, Solr will then also support second
pass caching and total count based on groups.

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