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Date: Sat, 3 Dec 2016 23:01:01 +0000 (UTC)
From: "Yonik Seeley (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <JIRA.13025190.1480709484000.432529.1480806061050@Atlassian.JIRA>
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References: <JIRA.13025190.1480709484000@Atlassian.JIRA> <JIRA.13025190.1480709484755@arcas>
Subject: [jira] [Commented] (SOLR-9822) Improve faceting performance with
 FieldCache
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archived-at: Sat, 03 Dec 2016 23:01:03 -0000


    [ https://issues.apache.org/jira/browse/SOLR-9822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15718886#comment-15718886 ] 

Yonik Seeley commented on SOLR-9822:
------------------------------------

Performance results of faceting on different fields...
The 3 versions tested were: Solr from 09/09, Solr from 12/03, Solr from 12/03 + patch
Solr from 09/09 is used as the baseline (old_time):

|| field cardinality || 12/03/2016 new_time / old_time || patch new_time/old_time ||
|10|1.52|0.97|
|100|1.52|0.98|
|1000|1.54|0.96|
|10000|1.54|1.00|
|100000|1.45|0.99|
|1000000|1.16|0.99|

Two takeaways:
- the seekExact changes that Adrien introduced had a positive impact vs the initial results in SOLR-9599... the worst-case dropped from 2x slower to 1.5x
- the patch in this issue fully restores the lost performance (plus a little due to an additional minor optimization)

> Improve faceting performance with FieldCache
> --------------------------------------------
>
>                 Key: SOLR-9822
>                 URL: https://issues.apache.org/jira/browse/SOLR-9822
>             Project: Solr
>          Issue Type: Sub-task
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Facet Module
>            Reporter: Yonik Seeley
>            Assignee: Yonik Seeley
>             Fix For: master (7.0)
>
>         Attachments: SOLR-9822.patch
>
>
> This issue will try to specifically address the performance regressions of faceting on FieldCache fields observed in SOLR-9599.


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