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https://issues.apache.org/jira/browse/LUCENE-7975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16189735#comment-16189735
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ASF subversion and git services commented on LUCENE-7975:
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Commit a9fb4ddf80f28c5de36459569f1c94a261a70e8e in lucene-solr's branch
refs/heads/master from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=a9fb4dd ]
LUCENE-7975: change the default taxonomy facets cache to a faster UTF-8 cache
> Replace facets taxonomy writer "cache" with BytesRefHash based implementation
> -----------------------------------------------------------------------------
>
> Key: LUCENE-7975
> URL: https://issues.apache.org/jira/browse/LUCENE-7975
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 7.1, master (8.0)
>
> Attachments: LUCENE-7975.patch, LUCENE-7975.patch
>
>
> When the facets module was first created we didn't have {{BytesRefHash}} and
> so the default cache ({{Cl2oTaxonomyWriterCache}} was quite a bit more
> complex than needed.
> I changed this to use a {{BytesRefHash}}, which stores labels as UTF8
> (reduces memory for ascii-only usage), and is also faster (~12% overall
> speedup on indexing time in my private tests).
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