[jira] [Created] (SOLR-9599) Facet performance regression using fieldcache and new DV iterator API

["Yonik Seeley (JIRA)" <ji...@apache.org>]

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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