https://issues.apache.org/jira/browse/AMQ-5274 - we now only check expiry on non inflight messages so there is on contention on ack with the periodic expriy check thread - related https://issues.apache.org/jira/browse/AMQ-2876
https://issues.apache.org/jira/browse/AMQ-5266 - fix edge case with optimizedDispatch=true where a single message could be pending till the next page in event
https://issues.apache.org/jira/browse/AMQ-5266 - remove err message print on iterator limit