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https://issues.apache.org/jira/browse/SOLR-5894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869820#comment-15869820
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Alessandro Benedetti commented on SOLR-5894:
--------------------------------------------

Hi Toke, 
I read your very interesting blog, but i assume we don't have any update on 
this.
It would be quite an interesting improvement ( especially for big Solr 
instances).
Is there any update on this topic or everything is still frozen ?

Cheers

> 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: author_7M_tags_1852_logged_queries_warmed.png, 
> 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, 
> 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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