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https://issues.apache.org/jira/browse/SOLR-2963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13553626#comment-13553626
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Mickael Magniez commented on SOLR-2963:
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Hi,
Any chance to see this issue resolved soon? We plan to migrate our ecommerce
website (3M documents) to Solr, but we need field collapsing, with decent
performances when retrieving groupcount.
Some facts about our performance :
1M document (700MB), 2CPU/8GB machine (2GB jvm)
For a query matching 100k documents, 700ms with ngoups=true vs 70ms with
ngroups=false
> 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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