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https://issues.apache.org/jira/browse/LUCENE-7975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-7975.
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Resolution: Fixed
> 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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