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From "Alexander Koval (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-4763) Performance issue when using group.facet=true
Date Thu, 25 Apr 2013 16:16:16 GMT

    [ https://issues.apache.org/jira/browse/SOLR-4763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13641922#comment-13641922
] 

Alexander Koval commented on SOLR-4763:
---------------------------------------

I'm sorry for that. I found 2 discussions in the mailing list:
http://lucene.472066.n3.nabble.com/Grouping-performance-problem-td3995245.html
http://lucene.472066.n3.nabble.com/group-facet-true-performances-td4021639.html

The solution has not been found.

I think with this issue it is not possible to use {{group.facet=true}} option in production.
                
> Performance issue when using group.facet=true
> ---------------------------------------------
>
>                 Key: SOLR-4763
>                 URL: https://issues.apache.org/jira/browse/SOLR-4763
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 4.2
>            Reporter: Alexander Koval
>
> I do not know whether this is bug or not. But calculating facets with {{group.facet=true}}
is too slow.
> I have query that:
> {code}
> "matches": 730597,
> "ngroups": 24024,
> {code}
> 1. All queries with {{group.facet=true}}:
> {code}
> "QTime": 5171
> "facet": {
>     "time": 4716
> {code}
> 2. Without {{group.facet}}:
> * First query:
> {code}
> "QTime": 3284
> "facet": {
>     "time": 3104
> {code}
> * Next queries:
> {code}
> "QTime": 230,
> "facet": {
>     "time": 76
> {code}
> So I think with {{group.facet=true}} Solr doesn't use cache to calculate facets.
> Is it possible to improve performance of facets when {{group.facet=true}}?

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