如何在 Mule XA 事务中为 ActiveMQ 启用 RedeliveryDelay
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【中文标题】如何在 Mule XA 事务中为 ActiveMQ 启用 RedeliveryDelay【英文标题】:How to enable RedeliveryDelay for ActiveMQ in Mule XA transactions 【发布时间】:2015-10-01 19:36:33 【问题描述】:我在 Mule 中有一个非常简单的流程,它侦听 ActiveMQ 队列,如果来自队列的消息包含字符串“fail”,则会引发异常。没有 XA 事务,一切正常。消息在 5 秒后重新发送,下一次在几秒钟后发送。在 5 次重新传递后,消息被移至死信队列。
对于 XA 事务,消息会立即重新传递 5 次,然后移动到死信队列。如何告诉 Mule 或 ActiveMQ 等待 RedeliveryDelay?
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:scripting="http://www.mulesoft.org/schema/mule/scripting"
xmlns:jbossts="http://www.mulesoft.org/schema/mule/jbossts" xmlns:jms="http://www.mulesoft.org/schema/mule/jms"
xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:spring="http://www.springframework.org/schema/beans" version="CE-3.6.1"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/jms http://www.mulesoft.org/schema/mule/jms/current/mule-jms.xsd
http://www.mulesoft.org/schema/mule/jbossts http://www.mulesoft.org/schema/mule/jbossts/current/mule-jbossts.xsd
http://www.mulesoft.org/schema/mule/scripting http://www.mulesoft.org/schema/mule/scripting/current/mule-scripting.xsd">
<spring:beans>
<!-- Redelivery Policy -->
<spring:bean id="redeliveryPolicy" class="org.apache.activemq.RedeliveryPolicy">
<spring:property name="maximumRedeliveries" value="5" />
<spring:property name="initialRedeliveryDelay" value="5000" />
<spring:property name="redeliveryDelay" value="5000" />
<spring:property name="useExponentialBackOff" value="true" />
<spring:property name="backOffMultiplier" value="1.5" />
</spring:bean>
<!-- ActiveMQ Connection factory -->
<spring:bean id="amqXAFactory"
class="org.apache.activemq.ActiveMQXAConnectionFactory" lazy-init="true"
name="amqXAFactory">
<spring:property name="brokerURL"
value="tcp://localhost:61616" />
<spring:property name="redeliveryPolicy" ref="redeliveryPolicy" />
</spring:bean>
</spring:beans>
<jbossts:transaction-manager doc:name="JBoss Transaction Manager">
<property key="com.arjuna.ats.arjuna.coordinator.defaultTimeout"
value="47" /><!-- this is in seconds -->
<property key="com.arjuna.ats.arjuna.coordinator.txReaperTimeout"
value="108000" /><!-- this is in milliseconds -->
</jbossts:transaction-manager>
<jms:activemq-connector name="Active_MQconnectorMessages"
specification="1.1" validateConnections="true" doc:name="Active MQ for XA"
persistentDelivery="true" connectionFactory-ref="amqXAFactory"
numberOfConsumers="1" maxRedelivery="5">
<reconnect-forever frequency="10000" />
</jms:activemq-connector>
<flow name="xatestFlow">
<jms:inbound-endpoint queue="xa.test" doc:name="JMS"
connector-ref="Active_MQconnectorMessages">
<xa-transaction action="ALWAYS_BEGIN" />
</jms:inbound-endpoint>
<logger message="Message from queue: #[payload]" level="INFO"
doc:name="Logger" />
<scripting:component doc:name="fail if payload contains fail">
<scripting:script engine="Groovy"><![CDATA[if (payload.contains("fail"))
throw new IllegalArgumentException("Failed...")
]]></scripting:script>
</scripting:component>
<logger message="Message is ready" level="INFO" doc:name="Logger" />
</flow>
</mule>
【问题讨论】:
【参考方案1】:花了一些时间,但我找到了解决方案。有两种配置,ActiveMQ中的服务器端和客户端。
在客户端 redeliveryPolicy 中,我将 maximumRedeliveries 更改为 0。在服务器上,我在 activemq.xml 中创建了 redeliveryPlugin:
<broker ....>
......
<plugins>
<redeliveryPlugin fallbackToDeadLetter="true" sendToDlqIfMaxRetriesExceeded="true">
<redeliveryPolicyMap>
<redeliveryPolicyMap>
<redeliveryPolicyEntries>
<!-- a destination specific policy -->
<redeliveryPolicy
queue="amm.input.to.router" maximumRedeliveries="3"
redeliveryDelay="7000"
initialRedeliveryDelay="5000"
useCollisionAvoidance="true"
/>
</redeliveryPolicyEntries>
<!-- the fallback policy for all other destinations -->
<defaultEntry>
<redeliveryPolicy
maximumRedeliveries="4"
useExponentialBackOff="true"
initialRedeliveryDelay="10000"
redeliveryDelay="5000"
useCollisionAvoidance="true"
backOffMultiplier="1.5"
maximumRedeliveryDelay="93600000" />
</defaultEntry>
</redeliveryPolicyMap>
</redeliveryPolicyMap>
</redeliveryPlugin>
</plugins>
</broker>
现在是 ActiveMQ 服务器负责重新交付,而不是客户端。
见http://activemq.apache.org/message-redelivery-and-dlq-handling.html
【讨论】:
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