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From "Pat Fox (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-3746) Non Durable Topic subscription with prefetch=0, MessageConsumer.receivenowait() (or MessageConsumer.receive(timeout) hangs indefinitely
Date Wed, 29 Feb 2012 20:25:58 GMT

    [ https://issues.apache.org/jira/browse/AMQ-3746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13219507#comment-13219507
] 

Pat Fox commented on AMQ-3746:
------------------------------

After applying "APotentialFixForAMQ-3746.patch" I noticed a change in exception behavior around
the "MessageListener" case. Before applying the patch ActiveMQMessageConsumer.setMessageListener()
throws the JMSException below when prefetch=0.

before patch:

{code}
javax.jms.JMSException: Illegal prefetch size of zero. This setting is not supported for asynchronous
consumers please set a value of at least 1
	at org.apache.activemq.ActiveMQMessageConsumer.setMessageListener(ActiveMQMessageConsumer.java:417)
	...
{code}

after applying the patch the following exception is thrown when creating the ActiveMQMessageConsumer
before ActiveMQMessageConsumer.setMessageListener() can be called. 

{code}
javax.jms.JMSException: Cannot have a prefetch size of zero for a Non Durable Topic Subscriber
	at org.apache.activemq.ActiveMQMessageConsumer.<init>(ActiveMQMessageConsumer.java:245)
	at org.apache.activemq.ActiveMQSession.createConsumer(ActiveMQSession.java:1134)
	at org.apache.activemq.ActiveMQSession.createConsumer(ActiveMQSession.java:1078)
	at org.apache.activemq.ActiveMQSession.createConsumer(ActiveMQSession.java:991)
	at org.apache.activemq.ActiveMQSession.createConsumer(ActiveMQSession.java:964)
	...
{code}	

Although it results in the same overall outcome, it does change the existing (correct) exception
behavior.

Hence not sure if "Fail Fast" in "APotentialFixForAMQ-3746.patch" is the best approach.
                
> Non Durable Topic subscription with prefetch=0, MessageConsumer.receivenowait() (or MessageConsumer.receive(timeout)
hangs indefinitely
> ---------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-3746
>                 URL: https://issues.apache.org/jira/browse/AMQ-3746
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.5.1
>            Reporter: Pat Fox
>         Attachments: APotentialFixForAMQ-3746.patch, TopicSubscriptionZeroPrefetchTest.patch
>
>
> Non Durable Topic subscription with prefetch=0, MessageConsumer.receivenowait() (or MessageConsumer.receive(timeout)
hangs indefinitely.
> I get the following thread dump
> {code}
> "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)
> {code}
> 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.

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