https://issues.apache.org/jira/browse/AMQ-4952 - deal with duplicates by redirecting to dlq when they are detected by the cursors such that they don't linger for redispatch after a restart. Networks are the main culprit for such duplicates b/c the producer audit traps regular failover resends
fix leveldb version of org.apache.activemq.bugs.AMQ2870Test#testSize