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https://issues.apache.org/jira/browse/SOLR-9599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15547177#comment-15547177
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Yonik Seeley commented on SOLR-9599:
------------------------------------
Here's the form of the request used (tests were run w/ logging at WARN level of
course):
{code}
2016-10-05 00:25:24.042 INFO (qtp110456297-16) [ x:collection1]
o.a.s.c.S.Request [collection1] webapp=/solr path=/select
params={q=*:*&json.facet={x:{method:dv,+type:terms,field:s10_s,limit:5}}&rows=0&wt=javabin}
hits=4993847 status=0 QTime=174
{code}
> 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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