I verified thread dump several times, there are a lot of messages like waiting for monitor entry ... at org.apache.lucene.index.SegmentReader.norms(SegmentReader.java:790)
It corresponds to method call: // returns fake norms if norms aren't available public synchronized byte[] norms(String field) throws IOException { ensureOpen(); byte[] bytes = getNorms(field); if (bytes==null) bytes=fakeNorms(); return bytes; } It didn't happen before (when I used CRON-Replication each night, and caches were rewarmed daily); it happens now almost each day (after significant loads generated by search engines). I'll send Thread Dump later, do not have access to logs right now... Thanks -- View this message in context: http://www.nabble.com/Server-Hungs-with-Lucene-2.3.1-tp16700425p16700425.html Sent from the Solr - Dev mailing list archive at Nabble.com.