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https://issues.apache.org/jira/browse/SOLR-2564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13046072#comment-13046072
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Michael McCandless commented on SOLR-2564:
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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: https://issues.apache.org/jira/browse/SOLR-2564
> 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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