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From "Hoss Man (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-2944) Anecdotal evidence that useFilterForSortedQuery has gotten much slower in 3.5 compared to 1.4
Date Fri, 02 Dec 2011 23:43:40 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13161926#comment-13161926
] 

Hoss Man commented on SOLR-2944:
--------------------------------

Uwe: totally possible, but he was upgrading from Solr 1.4, so there are lots of changes on
the table as possible culprits.
                
> Anecdotal evidence that useFilterForSortedQuery has gotten much slower in 3.5 compared
to 1.4
> ---------------------------------------------------------------------------------------------
>
>                 Key: SOLR-2944
>                 URL: https://issues.apache.org/jira/browse/SOLR-2944
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Hoss Man
>
> Pawel Rog reported on the user list that he was seeing significantly slower search performance
and much higher CPU usage using Solr 3.5 compared to Solr 1.4 when using the same configs
he had always used in Solr 1.4 -- even though he had a new index built with 3.5
> https://mail-archives.apache.org/mod_mbox/lucene-solr-user/201111.mbox/%3CCAF9ZkbPHo0Y-PvSkm4dkaNc7aArGacfSSHNQBL+nOOt1aHxLwA@mail.gmail.com%3E
> Based on stacktraces from threaddumps the "useFilterForSortedQuery" was determined to
be a contributing factor, and disabling it improved performance (exact comparison not provided).
 
> Would be nice to get some more details and a reproducible comparison (SOLR-2646 where
are you???) and evluate why useFilterForSortedQuery would be slower in 3.5 then in 1.4 with
the same data.
> Should consider actively removing the useFilterForSortedQuery=true option if there are
no longer any usecases where it's better then useFilterForSortedQuery=false

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