Michael McCandless created LUCENE-7811:
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Summary: Add concurrent version of SortedSetDocValuesFacetCounts
Key: LUCENE-7811
URL: https://issues.apache.org/jira/browse/LUCENE-7811
Project: Lucene - Core
Issue Type: Improvement
Reporter: Michael McCandless
Assignee: Michael McCandless
Fix For: master (7.0), 6.6
Counting up facets should take advantage of concurrent hardware if the index
has multiple segments.
At first I tried to add an optional {{ExecutorService}} argument to the
existing single-threaded {{SortedSetDocValuesFacetCounts}} but it was
difficult, so I just made a new class.
I also internally refactored {{SortedSetDocValuesFacetCounts}} to share code
between its {{count}} and {{countAll}} private methods, and switched the
{{FacetsCollector}} to use {{DocIdSetBuilder}} instead of always using a
{{FixedBitSet}}.
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