[QPID-6741] ThreadPoolExecutors used for virtual host IO / port IO do not scale above minimum pool size

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: qpid-java-6.0
• Fix Version/s: qpid-java-6.0
• Component/s: Broker-J
• Assignee: Unassigned
• Reporter: Keith Wall
• Created: 17/Sep/15 14:35
• Updated: 02/Oct/19 19:21
• Resolved: 23/Oct/15 08:57

Description

NetworkConnectionScheduler uses a java.util.concurrent.ThreadPoolExecutor to service AMQP IO. The intention is that the executor will dynamically scale the number of threads in the pool as load increases until a maximum is reached and then at that point requests will be queue. However, TPE, out of the box, does not offer such behaviour. When used with a unbounded queue, TPE will never increase the threads beyond the core size.