我目前正在构建一个使用请求-响应 jms 连接器的 Mule ESB 服务器应用程序。由于它在高并发环境中使用,我们在 MQ 配置中启用了 spring jms 缓存。
<spring:beans>
<mule>
<!-- MQ Factory -->
<spring:bean id="testMsgMqFactoryBean1" name="testMsgMqFactory1" class="com.ibm.mq.jms.MQQueueConnectionFactory">
<spring:property name="channel" value="${test.msg.mq.channel.1}" />
<spring:property name="queueManager" value="${test.msg.mq.queueManager.1}" />
<spring:property name="hostName" value="${test.msg.mq.hostName.1}" />
<spring:property name="port" value="${test.msg.mq.port.1}" />
<spring:property name="transportType" value="${mq.jms.transportType}" />
</spring:bean>
<spring:bean id="testMsgMqFactoryBeanCache1" class="org.springframework.jms.connection.CachingConnectionFactory">
<spring:property name="targetConnectionFactory" ref="testMsgMqFactoryBean1" />
<spring:property name="sessionCacheSize" value="${test.threading.profile.maxThreadsActive}" />
<spring:property name="cacheConsumers" value="false" />
<!-- <spring:property name="cacheProducers" value="false" /> -->
</spring:bean>
<!-- MQ Connector 1 -->
<jms:custom-connector name="testMsgMqConnector.1" class="org.mule.transport.jms.websphere.WebsphereJmsConnector" doc:name="Custom JMS">
<spring:property name="specification" value="1.1" />
<spring:property name="connectionFactory" ref="testMsgMqFactoryBeanCache1" />
<spring:property name="persistentDelivery" value="false" />
<spring:property name="disableTemporaryReplyToDestinations" value="true" />
<spring:property name="numberOfConsumers" value="${test.threading.profile.maxThreadsActive}" />
<spring:property name="maxRedelivery" value="-1" />
<receiver-threading-profile maxThreadsActive="${test.threading.profile.maxThreadsActive}" maxBufferSize="${test.threading.profile.maxBufferSize}" maxThreadsIdle="${test.threading.profile.maxThreadsIdle}"/>
<reconnect frequency="${mq.jms.reconnection.frequency}" count="${mq.jms.reconnection.count}" blocking="false" />
</jms:custom-connector>
<!-- msgworks inbound and outbound MQ setup -->
<!-- Rewards -->
<jms:endpoint exchange-pattern="request-response" queue="${test.msg.mq.inbound.account.queue}" name="testQueue1" connector-ref="testMsgMqConnector.1" doc:name="JMS" />
</mule>
</spring:beans>
当客户端使用静态回复队列时,此配置运行良好。但是,我们有一些客户正在使用动态/临时回复队列。由于org.springframework.jms.connection.CachingConnectionFactory
缓存生产者,对于每个临时的回复队列,生产者对象被缓存并且永远不会关闭。在处理了数百个请求后,应用程序开始抛出异常:
********************************************************************************
Message : Failed to create and dispatch response event over Jms destination "queue://QMGR1/TESTret5a975v53AF980F2006BE02?targetClient=1". Failed to route event via endpoint: null. Message payload is of type: JMSTextMessage
Code : MULE_ERROR-42999
--------------------------------------------------------------------------------
Exception stack is:
1. MQJE001: Completion Code 2, Reason 2017 (com.ibm.mq.MQException)
com.ibm.mq.MQQueueManager:2808 (null)
2. MQJMS2008: failed to open MQ queue TESTret5a975v53AF980F2006BE02(JMS Code: MQJMS2008) (javax.jms.ResourceAllocationException)
com.ibm.mq.jms.MQQueueServices:398 (http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/jms/ResourceAllocationException.html)
3. Failed to create and dispatch response event over Jms destination "queue://QMGR1/TESTret5a975v53AF980F2006BE02?targetClient=1". Failed to route event via endpoint: null. Message payload is of type: JMSTextMessage (org.mule.api.transport.DispatchException)
org.mule.transport.jms.JmsReplyToHandler:173 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/transport/DispatchException.html)
查了MQ错误码(MQJE001: Completion Code 2, Reason 2017),发现这个错误背后的原因是因为我们从来没有关闭生产者,而生产者在队列管理器上用尽了MQ Handles。快速简单的解决方法是取消注释 spring jms 缓存配置中的行以每次关闭生产者。
<spring:bean id="testMsgMqFactoryBeanCache1" class="org.springframework.jms.connection.CachingConnectionFactory">
<spring:property name="targetConnectionFactory" ref="testMsgMqFactoryBean1" />
<spring:property name="sessionCacheSize" value="${test.threading.profile.maxThreadsActive}" />
<spring:property name="cacheConsumers" value="false" />
<spring:property name="cacheProducers" value="false" />
</spring:bean>
现在我没有看到 MQ 问题,而是提出了另一个性能问题,因为没有缓存生产者,所以每次都会创建一个新的生产者。
我的问题是,如何处理这种情况?由于客户端不会改变他们从临时队列接收回复消息的方式,我们如何避免耗尽 MQ 处理程序而不影响性能。
非常感谢 - 雷