I'm experiencing similar issues. Mine seem to be related to old generation garbage collection. Can you monitor your garbage collection activity? (I'm using JConsole to monitor it: http://java.sun.com/developer/technicalArticles/J2SE/jconsole.html).
In my system, garbage collection usually doesn't cause any trouble. But once in a while, the size of the old generation flat-lines for some time (~dozens of seconds). When this happens, I see really bad response times from Solr (not quite as bad as you're seeing, but almost). The old-gen flat-lines always seem to be right before, or right after the old-gen is garbage collected. -- View this message in context: http://www.nabble.com/Intermittent-high-response-times-tp21602475p21608986.html Sent from the Solr - User mailing list archive at Nabble.com.
