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Date: Tue, 6 Dec 2016 07:46:58 +0000 (UTC)
From: "Toke Eskildsen (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <JIRA.12702855.1395405374000.447351.1481010418688@Atlassian.JIRA>
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Subject: [jira] [Commented] (SOLR-5894) Speed up high-cardinality facets
 with sparse counters
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archived-at: Tue, 06 Dec 2016 07:47:01 -0000


    [ https://issues.apache.org/jira/browse/SOLR-5894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15724715#comment-15724715 ] 

Toke Eskildsen commented on SOLR-5894:
--------------------------------------

No, those are fully separate issues.

Faceting is a bit of a mess with multiple implementations at multiple levels. See SOLR-7296 for more 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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