[QPID-6764] Message age alerting is inappropriate on the enqueue path

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: qpid-java-6.1
• Component/s: Broker-J
• Assignee: Robert Godfrey
• Reporter: Keith Wall
• Created: 02/Oct/15 10:36
• Updated: 17/Nov/16 13:05
• Resolved: 14/Mar/16 15:21

Description

The Java Broker supports number of configurable message/queue alerts such as message size alert (overly large messages), queue depth alert (queues with an unexpected number of message on them), or message age alert (a queue containing a message which is older than a threshold). These checks are performed in two places: periodically by housekeeping and when a message is enqueued.

The message age alert check is performed on by housekeeping and on enqueue of a new message. The latter check is inappropriate and is a waste of resources. Unlike the other checks, enqueuing a message can't affect the outcome. It should be performed only be housekeeping.

The message age check involves taking a lock on the oldest message - so may have a significant computation overhead.