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Posted to dev@lucene.apache.org by "Alessandro Benedetti (JIRA)" <ji...@apache.org> on 2016/05/31 16:47:12 UTC

[jira] [Created] (SOLR-9176) Legacy Faceting Term Enum Method Regression

Alessandro Benedetti created SOLR-9176:
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             Summary: Legacy Faceting Term Enum Method Regression
                 Key: SOLR-9176
                 URL: https://issues.apache.org/jira/browse/SOLR-9176
             Project: Solr
          Issue Type: Bug
          Components: faceting
    Affects Versions: 6.0.1, 6.0, 5.5.1, 5.5, 5.4.1, 5.4, 5.3.2, 5.3.1, 5.3, 5.2.1, 5.2
            Reporter: Alessandro Benedetti


Starting from this commit :

LUCENE-5666: get solr started
git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene5666@1594254 13f79535-47bb-0310-9956-ffa450edef68

It is not possible to use Term Enum as a faceting method, for numeric and single valued fields.
We personally verified that there are use cases when this is bringing a quite big performance regression  ( even with DocValues enabled) .
In the mailing list from time to time people complain about a regression happening with the term enum method, but actually it is more likely to be the   automatic forcing of FCS.

Forcing FCS in co-op with the famous regression that happened in SOLR-8096 could be confused as a term Enum regression.



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