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https://issues.apache.org/jira/browse/SOLR-2205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925899#action_12925899
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Martijn van Groningen commented on SOLR-2205:
---------------------------------------------

bq. Are these a different set of optimizations than those already proposed: 
SOLR-2069, SOLR-2068, SOLR-2070, and the rather unspecific SOLR-2071?

This patch is more a general improvement fix and I think wouldn't really fit in 
any of these issue.

> Grouping performance improvements
> ---------------------------------
>
>                 Key: SOLR-2205
>                 URL: https://issues.apache.org/jira/browse/SOLR-2205
>             Project: Solr
>          Issue Type: Sub-task
>          Components: search
>    Affects Versions: 4.0
>            Reporter: Martijn van Groningen
>             Fix For: 4.0
>
>         Attachments: SOLR-2205.patch
>
>
> This issue is dedicated to the performance of the grouping functionality.
> I've noticed that the code is not really performing on large indexes. Doing a 
> search (q=*:*) with grouping on an index from around 5M documents took around 
> one second on my local development machine. We had to support grouping on an 
> index that holds around 50M documents per machine, so we made some changes 
> and were able to happily serve that amount of documents. Patch will follow 
> soon.

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