David Smiley created SOLR-11595:
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Summary: optimize SolrIndexSearcher.localCollectionStatistics to
use cached MultiFields
Key: SOLR-11595
URL: https://issues.apache.org/jira/browse/SOLR-11595
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: search
Reporter: David Smiley
Assignee: David Smiley
Priority: Minor
Fix For: 7.2
{{SolrIndexSearcher.localCollectionStatistics(field)}} simply calls Lucene's
{{IndexSearcher.collectionStatistics(field)}} which in turn calls
{{MultiFields.getTerms(reader, field)}}. Profiling in an app with many 150
fields in the query shows that building the MultiTerms here is expensive.
Fortunately it turns out that Solr already has a cached instance via
{{SlowCompositeReaderWrapper}} (using MultiFields which has a ConcurrentHashMap
to the MultiTerms keyed by field String.
Perhaps this should be improved on the Lucene side... not sure. But here on
the Solr side, the solution is straight-forward.
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