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https://issues.apache.org/jira/browse/SOLR-9599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15547522#comment-15547522
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Yonik Seeley commented on SOLR-9599:
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I tried some docValue fields this time instead of the fieldcache:
|| field cardinality || new_time / old_time ||
|10|1.29|
|1000|1.23|
|10000|1.24|
|100000|1.34|
|1000000|1.09|
> Facet performance regression using fieldcache and new DV iterator API
> ---------------------------------------------------------------------
>
> Key: SOLR-9599
> URL: https://issues.apache.org/jira/browse/SOLR-9599
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: master (7.0)
> Reporter: Yonik Seeley
> Fix For: master (7.0)
>
>
> I did a quick performance comparison of faceting indexed fields (i.e.
> docvalues are not stored) using method=dv before and after the new docvalues
> iterator went in (LUCENE-7407).
> 5M document index, 21 segments, single valued string fields w/ no missing
> values.
> || field cardinality || new_time / old_time ||
> |10|2.01|
> |1000|2.02|
> |10000|1.85|
> |100000|1.56|
> |1000000|1.31|
> So unfortunately, often twice as slow.
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