In A-MQ 6.3, expired messages not removed from Database.

Issue

• I set message's TTL by <to uri="jms:queue:xyz?timeToLive=1000" /> or producer.setTimeToLive(5000) from producer, normally, the expired messages will be removed or move to DLQ by the queue from A-MQ 6.3.

• But if I used Database instead of Kahadb as persistence store, the behaviour sometime didn't work well, the message will stay in the queue forever, the debug log shows:

2018-04-10 12:49:50,347 | DEBUG | r[amq] Scheduler | Queue                            | che.activemq.broker.region.Queue  923 | 162 - org.apache.activemq.activemq-osgi - 5.11.0.redhat-630310 | queue:/Q1 expiring messages ..
2018-04-10 12:49:50,347 | DEBUG | r[amq] Scheduler | Queue                            | che.activemq.broker.region.Queue  929 | 162 - org.apache.activemq.activemq-osgi - 5.11.0.redhat-630310 | queue:/Q1 expiring messages done.
2018-04-10 12:49:50,347 | DEBUG | [amq] Task-55875 | Queue                            | che.activemq.broker.region.Queue 1926 | 162 - org.apache.activemq.activemq-osgi - 5.11.0.redhat-630310 | queue:/Q1, subscriptions=0, memory=70%, size=1456, pending=0 toPageIn: 200, force:false, Inflight: 0, pagedInMessages.size 0, pagedInPendingDispatch.size 0, enqueueCount: 1978, dequeueCount: 522, memUsage:7407760, maxPageSize:200
...
2018-04-13 11:12:52,647 | DEBUG | r[amq] Scheduler | Queue                            | che.activemq.broker.region.Queue  923 | 162 - org.apache.activemq.activemq-osgi - 5.11.0.redhat-630310 | queue:/Q1 expiring messages ..
2018-04-13 11:12:52,647 | DEBUG | r[amq] Scheduler | Queue                            | che.activemq.broker.region.Queue  929 | 162 - org.apache.activemq.activemq-osgi - 5.11.0.redhat-630310 | queue:/Q1 expiring messages done.
2018-04-13 11:12:52,647 | DEBUG | [amq] Task-58049 | Queue                            | che.activemq.broker.region.Queue 1926 | 162 - org.apache.activemq.activemq-osgi - 5.11.0.redhat-630310 | queue:/Q1, subscriptions=0, memory=70%, size=1670, pending=0 toPageIn: 200, force:false, Inflight: 0, pagedInMessages.size 0, pagedInPendingDispatch.size 0, enqueueCount: 2192, dequeueCount: 522, memUsage:7407760, maxPageSize:200

• The expired messages stayed in Queue and Database forever.