[jira] [Created] (SOLR-12878) FacetFieldProcessorByHashDV is reconstructing FieldInfos on every instantiation

["Tim Underwood (JIRA)" <ji...@apache.org>]

Tim Underwood created SOLR-12878:
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             Summary: FacetFieldProcessorByHashDV is reconstructing FieldInfos on every instantiation
                 Key: SOLR-12878
                 URL: https://issues.apache.org/jira/browse/SOLR-12878
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: Facet Module
    Affects Versions: 7.5
            Reporter: Tim Underwood


The FacetFieldProcessorByHashDV constructor is currently calling:

{noformat}
FieldInfo fieldInfo = fcontext.searcher.getSlowAtomicReader().getFieldInfos().fieldInfo(sf.getName());
{noformat}

Which is reconstructing FieldInfos each time.  Simply switching it to:

{noformat}
FieldInfo fieldInfo = fcontext.searcher.getFieldInfos().fieldInfo(sf.getName());
{noformat}
 
causes it to use the cached version of FieldInfos in the SolrIndexSearcher.

On my index the FacetFieldProcessorByHashDV is 2-3 times slower than the legacy facets without this fix.




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