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https://issues.apache.org/jira/browse/SOLR-669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12618578#action_12618578
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Fuad Efendi commented on SOLR-669:
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To confirm:
- SOLR uses Lucene internals (with caching) only if field is non-tokenized
single-valued non-boolean, and SOLR does not have own cache to store calculated
intersections (_faceting_).
> SOLR currently does not support caching for (Query, FacetFieldList)
> -------------------------------------------------------------------
>
> Key: SOLR-669
> URL: https://issues.apache.org/jira/browse/SOLR-669
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 1.3
> Reporter: Fuad Efendi
> Original Estimate: 1680h
> Remaining Estimate: 1680h
>
> It is huge performance bottleneck and it describes huge difference between
> qtime and SolrJ's elapsedTime. I quickly browsed SolrIndexSearcher: it caches
> only (Key, DocSet/DocList <Lucene Ids>) key-value pairs and it does not have
> cache for (Query, FacetFieldList).
> filterCache stores DocList for each 'filter' and is used for constant
> recalculations...
> This would be significant performance improvement.
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