Hi all, After upgrading from Solr 3.5 to 4.2.1, I noticed our filterCache hit ratio had dropped significantly.
Previously it was at 95+%, but now it's < 50%. I enabled recording 100 entries for debugging, and in looking at them it seems that edismax (and faceting) is creating entries for me. This is in a sharded setup, so it's a distributed search. If I do a search for the string "bogus text" using edismax on two fields, I get an entry in each of the shard's filter caches that looks like: item_+(((field1:bogus | field2:bogu) (field1:text | field2:text))~2): Is this expected? I have a similar situation happening during faceted search, even though my fields are single-value/untokenized strings, and I'm not using the enum facet method. But I'll get many, many entries in the filterCache for facet values, and they all look like "item_<facet field>:<facet value>:" The net result of the above is that even with a very big filterCache size of 2K, the hit ratio is still only 60%. Thanks for any insights, -- Ken -------------------------- Ken Krugler +1 530-210-6378 http://www.scaleunlimited.com custom big data solutions & training Hadoop, Cascading, Cassandra & Solr
