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From Kempelen, Ákos <>
Subject Result grouping performance
Date Wed, 22 Nov 2017 13:13:42 GMT

I am migrating our codebase from Solr 4.7 to 7.0.1 but the performance of result grouping
seems very poor using the newer Solr.
For example a simple MatchAllDocsQuery takes 5 sec on Solr4.7, and 21 sec on Solr7.
I wonder what causes the x4 difference in time? We hoped that newer Solr versions will provide
better performances...
Using Field collapsing could would be a solution, but it produces different facet counts.

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