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https://issues.apache.org/jira/browse/SOLR-2963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13554832#comment-13554832
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Mickael Magniez commented on SOLR-2963:
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I try various values, no performance improvement with any percent value
> Improving the performance of group.ngroups=true when there are a lot of
> unique groups
> -------------------------------------------------------------------------------------
>
> Key: SOLR-2963
> URL: https://issues.apache.org/jira/browse/SOLR-2963
> Project: Solr
> Issue Type: Improvement
> Components: SearchComponents - other
> Affects Versions: 3.5
> Environment: Linux (Debian 6) 64bit, Java 6, 21GB RAM (Xmx), Solr 3.5
> Reporter: Michael Jakl
>
> The performance of computing the total number of groups (by setting
> group.ngroups=true) degrades badly when there are many unique groups.
> It would be very useful to have an adequate number of groups to provide good
> means for paging through the results etc.
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