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https://issues.apache.org/jira/browse/SOLR-10194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15881542#comment-15881542
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Shawn Heisey commented on SOLR-10194:
-------------------------------------
This could be part of an issue where the description is just "Solr 6.x
performance is much worse than Solr 4.x performance." This statement is
particularly true when facets (and probably grouping) are involved. For the
person who filed this issue (who I have been talking to via IRC), enabling
docValues and reindexing makes performance worse, not better.
> Unable to use the UninvertedField implementation with legacy facets
> -------------------------------------------------------------------
>
> Key: SOLR-10194
> URL: https://issues.apache.org/jira/browse/SOLR-10194
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: 6.2, 6.3, 6.4.1
> Environment: Linux
> Reporter: Victor Igumnov
> Priority: Minor
> Labels: easyfix
>
> FacetComponent's method "modifyRequestForFieldFacets" modifies the
> distributed facet request and sets the mincount count to zero which then the
> SimpleFacets implementation is unable to get into the UIF code block when
> facet.method=uif is applied. The workaround which I found is to use
> facet.distrib.mco=true which sets the mincount to one instead of zero.
> Working:
> http://somehost:9100/solr/collection/select?facet.method=uif&facet.field=attribute&q=*:*&facet=true&debug=true&facet.distrib.mco=true
>
> None-Working:
> http://somehost:9100/solr/collection/select?facet.method=uif&facet.field=attribute&q=*:*&facet=true&debug=true&facet.distrib.mco=false
> Semi-working when it isn't a distributed call:
> http://somehost:9100/solr/collection/select?facet.method=uif&facet.field=attribute&q=*:*&facet=true&debug=true&facet.distrib.mco=false&distrib=false
> Just make sure to run it on a multi-shard setup.
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