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https://issues.apache.org/jira/browse/SOLR-2205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925890#action_12925890
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Yonik Seeley commented on SOLR-2205:
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Cool!
Are these a different set of optimizations than those already proposed:
SOLR-2069, SOLR-2068, SOLR-2070, and the rather unspecific SOLR-2071?
> 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
>
>
> 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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