Yonik Seeley created SOLR-9599:
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Summary: Facet performance regression using fieldcache and new DV
iterator API
Key: SOLR-9599
URL: https://issues.apache.org/jira/browse/SOLR-9599
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: master (7.0)
Reporter: Yonik Seeley
Fix For: master (7.0)
I did a quick performance comparison of faceting indexed fields (i.e. docvalues
are not stored) using method=dv before and after the new docvalues iterator
went in (LUCENE-7407).
5M document index, 21 segments, single valued string fields w/ no missing
values.
|| field cardinality || new_time / old_time ||
|10|2.01|
|1000|2.02|
|10000|1.85|
|100000|1.56|
|1000000|1.31|
So unfortunately, often twice as slow.
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