jms Mule max redelivery超出

Question

我有很简单的从HornetQ队列中读取MULE并将Object保存到数据库的设置:

设置如下:

<jms:connector name="connector.jms" maxRedelivery="1" connectionFactory-ref="hornetQConnectionFactory" doc:name="JMS"
        createMultipleTransactedReceivers="true"
        numberOfConcurrentTransactedReceivers="100"
        acknowledgementMode="AUTO_ACKNOWLEDGE">
    <reconnect count="50" frequency="5000"/>       
</jms:connector>
<flow name="jmsListenerFlow1" doc:name="jmsListenerFlow1">
    <jms:inbound-endpoint queue="adsLogQueue" connector-ref="connector.jms" doc:name="JMS">
        <jms:transaction action="ALWAYS_BEGIN"/>
    </jms:inbound-endpoint>
    <component >
        <spring-object bean="logSaver"/>
    </component>

</flow>

为什么在maxRedelivery设置为1时,我会在端点上收到消息已重新传送9次的消息？它究竟意味着什么？

hornetQConnectionFactory:

        <bean name="hornetQTransportConfiguration" class="org.hornetq.api.core.TransportConfiguration">
        <constructor-arg value="org.hornetq.core.remoting.impl.netty.NettyConnectorFactory"/>
        <constructor-arg>
            <map>
                <entry key="host" value="${jms.host}" /> 
                <entry key="port" value="${jms.port}" /> 
            </map>
        </constructor-arg>

    </bean>
    <bean name="hornetQConnectionFactory" class="org.hornetq.jms.client.HornetQJMSConnectionFactory">
        <constructor-arg index="0" value="false"/>
        <constructor-arg index="1" ref="hornetQTransportConfiguration"/>
        <property name="minLargeMessageSize" value="250000"/>
        <property name="cacheLargeMessagesClient" value="false"/>
    </bean>

任何帮助将不胜感激!

下面的堆栈跟踪.

ERROR 2012-10-19 01:04:07,283 [Thread-3013 (HornetQ-client-global-threads-1442093417)]: 

Message               : "Message with id "ID:e6a0b303-1977-11e2-96d4-810571a3fe10" has been redelivered 9 times on endpoint "jms://adsLogQueue", which exceeds the maxRedelivery setting of 1 on the connector "connector.jms". Message payload is of type: HornetQObjectMessage
Code                  : MULE_ERROR--2

Exception stack is:
1. "Message with id "ID:e6a0b303-1977-11e2-96d4-810571a3fe10" has been redelivered 9 times on endpoint "jms://adsLogQueue", which exceeds the maxRedelivery setting of 1 on the connector "connector.jms". Message payload is of type: HornetQObjectMessage (org.mule.transport.jms.redelivery.MessageRedeliveredException)
  org.mule.transport.jms.redelivery.JmsXRedeliveryHandler:91 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/transport/jms/redelivery/MessageRedeliveredException.html)

Root Exception stack trace:
org.mule.transport.jms.redelivery.MessageRedeliveredException: "Message with id "ID:e6a0b303-1977-11e2-96d4-810571a3fe10" has been redelivered 9 times on endpoint "jms://adsLogQueue", which exceeds the maxRedelivery setting of 1 on the connector "connector.jms". Message payload is of type: HornetQObjectMessage
    at org.mule.transport.jms.redelivery.JmsXRedeliveryHandler.handleRedelivery(JmsXRedeliveryHandler.java:91)
    at org.mule.transport.jms.MultiConsumerJmsMessageReceiver$JmsWorker.preProcessMessage(MultiConsumerJmsMessageReceiver.java:418)
    at org.mule.transport.AbstractReceiverWorker$1$1.process(AbstractReceiverWorker.java:120)
    + 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
********************************************************************************

Answer 1

首先要注意的是Mule正在使用JmsXRedeliveryHandler,这意味着它已经检测到HornetQ支持JMS_X_DELIVERY_COUNT头部,并将负责计算重新交付的数量.在这种情况下,Mule完全依赖HornetQ来提供准确的重新交付数量.

抛出此异常意味着已向Mule呈现JMS消息,其重新传递计数超过JMS连接器上配置的计数(在您的情况下为1).

由于你在一个事务中使用,所以可能发生的事情是HornetQ将在每次重启时回滚并向Mule表示此消息,一次又一次,除非你已经在HornetQ本身配置了最大重新传递计数.

我的建议是:在Mule和HornetQ上设置相同的重新计数或在Mule上使用-1(无限制)并完全依赖HornetQ的重新传递限制.