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https://issues.apache.org/jira/browse/SOLR-5894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14935297#comment-14935297
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Markus Jelsma commented on SOLR-5894:
-------------------------------------
Hey - any news on this?
> Speed up high-cardinality facets with sparse counters
> -----------------------------------------------------
>
> Key: SOLR-5894
> URL: https://issues.apache.org/jira/browse/SOLR-5894
> Project: Solr
> Issue Type: Improvement
> Components: SearchComponents - other
> Affects Versions: 4.7.1
> Reporter: Toke Eskildsen
> Priority: Minor
> Labels: faceted-search, faceting, memory, performance
> Attachments: SOLR-5894.patch, SOLR-5894.patch, SOLR-5894.patch,
> SOLR-5894.patch, SOLR-5894.patch, SOLR-5894.patch, SOLR-5894.patch,
> SOLR-5894.patch, SOLR-5894.patch, SOLR-5894_test.zip, SOLR-5894_test.zip,
> SOLR-5894_test.zip, SOLR-5894_test.zip, SOLR-5894_test.zip,
> author_7M_tags_1852_logged_queries_warmed.png,
> sparse_2000000docs_fc_cutoff_20140403-145412.png,
> sparse_5000000docs_20140331-151918_multi.png,
> sparse_5000000docs_20140331-151918_single.png,
> sparse_50510000docs_20140328-152807.png
>
>
> Multiple performance enhancements to Solr String faceting.
> * Sparse counters, switching the constant time overhead of extracting top-X
> terms with time overhead linear to result set size
> * Counter re-use for reduced garbage collection and lower per-call overhead
> * Optional counter packing, trading speed for space
> * Improved distribution count logic, greatly improving the performance of
> distributed faceting
> * In-segment threaded faceting
> * Regexp based white- and black-listing of facet terms
> * Heuristic faceting for large result sets
> Currently implemented for Solr 4.10. Source, detailed description and
> directly usable WAR at http://tokee.github.io/lucene-solr/
> This project has grown beyond a simple patch and will require a fair amount
> of co-operation with a committer to get into Solr. Splitting into smaller
> issues is a possibility.
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