[AMQ-3746] Non Durable Topic subscription with prefetch=0, MessageConsumer.receivenowait() (or MessageConsumer.receive(timeout) hangs indefinitely

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 5.5.1
• Fix Version/s: 5.8.0
• Component/s: Broker
• Assignee: Timothy A. Bish
• Reporter: Pat Fox
• Created: 29/Feb/12 13:07
• Updated: 28/Oct/12 18:58
• Resolved: 28/Oct/12 18:58

Description

Non Durable Topic subscription with prefetch=0, MessageConsumer.receivenowait() (or MessageConsumer.receive(timeout) hangs indefinitely.

I get the following thread dump

"main" prio=5 tid=7f996d000000 nid=0x105bc3000 in Object.wait() [105bc1000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <7f39f1b30> (a java.lang.Object)
	at java.lang.Object.wait(Object.java:485)
	at org.apache.activemq.SimplePriorityMessageDispatchChannel.dequeue(SimplePriorityMessageDispatchChannel.java:87)
	- locked <7f39f1b30> (a java.lang.Object)
	at org.apache.activemq.ActiveMQMessageConsumer.dequeue(ActiveMQMessageConsumer.java:468)
	at org.apache.activemq.ActiveMQMessageConsumer.receiveNoWait(ActiveMQMessageConsumer.java:621)
	at org.apache.activemq.usecases.TopicSubscriptionZeroPrefetchTest.testTopicConsumerPrefetchZero(TopicSubscriptionZeroPrefetchTest.java:71)

It seems the TopicSubscription does not support "pullMessage".

This only appears to impact Non Durable Topic Subscriptions. Durable Topic Subscriptions with prefetch=0 do NOT exhibit this behavior.