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Posted to issues@solr.apache.org by "David Smiley (Jira)" <ji...@apache.org> on 2021/03/14 15:55:00 UTC

[jira] [Created] (SOLR-15259) Lower default hl.fragAlignRatio

David Smiley created SOLR-15259:
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             Summary: Lower default hl.fragAlignRatio
                 Key: SOLR-15259
                 URL: https://issues.apache.org/jira/browse/SOLR-15259
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: highlighter
            Reporter: David Smiley


The {{hl.fragAlignRatio}} (for Unified Highlighter) has a large impact on performance.  The default of 0.5 tries to place the highlighted words in the middle of the fragment.  Lowering to somewhere between 0.20 and 0.33 can help a lot -- see SOLR-15246 and previously in https://lists.apache.org/thread.html/r2e44d290eac9edfa61ed9eced0d9f01a7bd1cbdf910344b2aa2368b8%40%3Csolr-user.lucene.apache.org%3E

Lowering to 0.33 (to thus first third) is a better balance.



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