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From Kaan Erdener <>
Subject improve performance after commit
Date Tue, 06 Mar 2007 19:49:13 GMT

I'm looking for some tips / suggestions around reducing the query  
time for Solr after I've post'ed a commit request. My Lucene index  
contains around 2,000,000 documents, and I have a job that  
periodically removes artibrary documents from Lucene and replaces  
them with fresh copies from a database. Whenever that cycle occurs, I  
send a commit to Solr to expose the updates. The problem is that  
immediately after the commit, a Solr query that previously took  
5-20ms now takes 20-25 seconds. Ouch.

I know that commit can be expensive, although I don't know by how  
much, or what I might do to mitigate the expense. I haven't much doc  
around this topic. I've also tried different cache settings  
(basically using high values for cache and auto-warm sizes) but that  
doesn't seem to make much of a difference.

I'll keep investigating on my own, but if anyone has any suggestions  
or additional info, I would greatly appreciate it.


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