Michael McCandless created LUCENE-7975:
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Summary: 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: master (8.0), 7.1
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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