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From "Yonik Seeley (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, 09 Dec 2011 03:51:39 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13165820#comment-13165820
] 

Yonik Seeley commented on SOLR-2944:
------------------------------------

I've done some ad-hoc testing using the useFilterForSortedQuery option on 1.4.1 and 3.5.
3.5 has turned out faster in every case I tested (between 1.3 and 2.1 times faster).

The indexes built weren't quite equivalent because of the merge policies.
The 1.4 index had 6 segments, and the 3.5 index had 17 segments.
                
> 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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