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https://issues.apache.org/jira/browse/SOLR-16818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17727597#comment-17727597
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Joel Bernstein commented on SOLR-16818:
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Yeah, all string facets are computed with top-level DV caches.

> Add "warm" parameter to field definition
> ----------------------------------------
>
>                 Key: SOLR-16818
>                 URL: https://issues.apache.org/jira/browse/SOLR-16818
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Joel Bernstein
>            Assignee: Joel Bernstein
>            Priority: Major
>
> This is something that should have been done a long time ago. Many of the 
> performance problems I've seen are due to not adding static warming queries 
> for facets and joins. Expecting users to understand this is simply not the 
> right approach. This ticket will add a "warm" parameter to fields which will 
> warm the top level doc values cache after each new searcher is opened. 
> We may want to deprecate static warming queries altogether in later releases 
> of Solr because in my opinion their only job is to warm top level doc values 
> caches.
> The approach to warming fields would be to inject some code where the static 
> warming queries are executed which loops through all the fields marked 
> warm=true in the schema and load the top level doc values for that field. 



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