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https://issues.apache.org/jira/browse/SOLR-2205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martijn van Groningen closed SOLR-2205.
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Resolution: Fixed
Fix Version/s: 3.3
Fixed. The proposed changes got into Solr 3x and 4.0-dev.
> 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, 3.3
>
> Attachments: SOLR-2205.patch, 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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