Question

我在消息驱动的应用程序中使用Spring AMQP。我注意到在我的消息监听器的调用之间几乎持续有大约300ms的延迟，即使我确信队列中充满了消息。下面的日志文件显示了BlockingQueueConsumer.nextMessage和BlockingQueueConsumer.handle之间的延迟，并在其间的另一个线程中调用了BlockingQueueConsumer.handleDelivery：

2015-05-12 12:46:18,655 TRACE [SimpleAsyncTaskExecutor-1] SimpleMessageListenerContainer.doReceiveAndExecute Waiting for message from consumer.
2015-05-12 12:46:18,655 DEBUG [SimpleAsyncTaskExecutor-1] BlockingQueueConsumer.nextMessage Retrieving delivery for Consumer: tags=[{amq.ctag-wwui6QjS1fAnFPM7j6GIvw=my-queue}], channel=Cached Rabbit Channel: AMQChannel(mybrokerip,1), acknowledgeMode=AUTO local queue size=0
2015-05-12 12:46:18,967 DEBUG [pool-1-thread-6 ] BlockingQueueConsumer.handleDelivery Storing delivery for Consumer: tags=[{amq.ctag-wwui6QjS1fAnFPM7j6GIvw=my-queue}], channel=Cached Rabbit Channel: AMQChannel(mybrokerip,1), acknowledgeMode=AUTO local queue size=0
2015-05-12 12:46:18,967 DEBUG [SimpleAsyncTaskExecutor-1] BlockingQueueConsumer.handle Received message: (Body:'[B@18dc305(byte[186])'MessageProperties [headers={..headers..}, timestamp=Tue May 12 01:16:06 CEST 2015, messageId=143134227498011576, userId=null, appId=SPT-T-2, clusterId=null, type=HBT, correlationId=null, replyTo=null, contentType=text, contentEncoding=UTF-8, contentLength=0, deliveryMode=PERSISTENT, expiration=null, priority=null, redelivered=false, receivedExchange=incoming, receivedRoutingKey=my-queue, deliveryTag=8, messageCount=0])
2015-05-12 12:46:18,967 INFO  [SimpleAsyncTaskExecutor-1] QueueMessageHandler.onMessage Incoming
2015-05-12 12:46:18,967 INFO  [SimpleAsyncTaskExecutor-1] QueueMessageHandler.onMessage Done
2015-05-12 12:46:18,967 TRACE [SimpleAsyncTaskExecutor-1] SimpleMessageListenerContainer.doReceiveAndExecute Waiting for message from consumer.
2015-05-12 12:46:18,967 DEBUG [SimpleAsyncTaskExecutor-1] BlockingQueueConsumer.nextMessage Retrieving delivery for Consumer: tags=[{amq.ctag-wwui6QjS1fAnFPM7j6GIvw=my-queue}], channel=Cached Rabbit Channel: AMQChannel(mybrokerip,1), acknowledgeMode=AUTO local queue size=0
2015-05-12 12:46:19,280 DEBUG [pool-1-thread-7 ] BlockingQueueConsumer.handleDelivery Storing delivery for Consumer: tags=[{amq.ctag-wwui6QjS1fAnFPM7j6GIvw=my-queue}], channel=Cached Rabbit Channel: AMQChannel(mybrokerip,1), acknowledgeMode=AUTO local queue size=0
2015-05-12 12:46:19,280 DEBUG [SimpleAsyncTaskExecutor-1] BlockingQueueConsumer.handle Received message: (Body:'[B@1aaa7d8(byte[186])'MessageProperties [headers={..headers..}, timestamp=Tue May 12 01:17:08 CEST 2015, messageId=143134227498011584, userId=null, appId=SPT-T-2, clusterId=null, type=HBT, correlationId=null, replyTo=null, contentType=text, contentEncoding=UTF-8, contentLength=0, deliveryMode=PERSISTENT, expiration=null, priority=null, redelivered=false, receivedExchange=incoming, receivedRoutingKey=my-queue, deliveryTag=9, messageCount=0])
2015-05-12 12:46:19,280 INFO  [SimpleAsyncTaskExecutor-1] QueueMessageHandler.onMessage Incoming
2015-05-12 12:46:19,280 INFO  [SimpleAsyncTaskExecutor-1] QueueMessageHandler.onMessage Done
2015-05-12 12:46:19,280 TRACE [SimpleAsyncTaskExecutor-1] SimpleMessageListenerContainer.doReceiveAndExecute Waiting for message from consumer.
2015-05-12 12:46:19,280 DEBUG [SimpleAsyncTaskExecutor-1] BlockingQueueConsumer.nextMessage Retrieving delivery for Consumer: tags=[{amq.ctag-wwui6QjS1fAnFPM7j6GIvw=my-queue}], channel=Cached Rabbit Channel: AMQChannel(mybrokerip,1), acknowledgeMode=AUTO local queue size=0
2015-05-12 12:46:19,577 DEBUG [pool-1-thread-3 ] BlockingQueueConsumer.handleDelivery Storing delivery for Consumer: tags=[{amq.ctag-wwui6QjS1fAnFPM7j6GIvw=my-queue}], channel=Cached Rabbit Channel: AMQChannel(mybrokerip,1), acknowledgeMode=AUTO local queue size=0
2015-05-12 12:46:19,577 DEBUG [SimpleAsyncTaskExecutor-1] BlockingQueueConsumer.handle Received message: (Body:'[B@1c893d2(byte[186])'MessageProperties [headers={..headers..}, timestamp=Tue May 12 01:18:07 CEST 2015, messageId=143134227498011592, userId=null, appId=SPT-T-2, clusterId=null, type=HBT, correlationId=null, replyTo=null, contentType=text, contentEncoding=UTF-8, contentLength=0, deliveryMode=PERSISTENT, expiration=null, priority=null, redelivered=false, receivedExchange=incoming, receivedRoutingKey=my-queue, deliveryTag=10, messageCount=0])
2015-05-12 12:46:19,577 INFO  [SimpleAsyncTaskExecutor-1] QueueMessageHandler.onMessage Incoming
2015-05-12 12:46:19,577 INFO  [SimpleAsyncTaskExecutor-1] QueueMessageHandler.onMessage Done

日志文件显示队列肯定充满消息时的消息处理。我的Spring配置文件的相关部分如下所示：

<rabbit:connection-factory id="amqpConnectionFactory" connection-factory="clientConnectionFactory"
    host="${amqp.broker.ip}"
    port="${amqp.broker.port}"
    virtual-host="${amqp.broker.vhost}"
    username="${amqp.user}"
    password="${amqp.password}"/>

<bean id="clientConnectionFactory" class="org.springframework.amqp.rabbit.connection.RabbitConnectionFactoryBean">
    <property name="useSSL" value="true" />
    <property name="sslPropertiesLocation" value="classpath:server.ini"/>
</bean>

<bean id="amqpTemplate" class="org.springframework.amqp.rabbit.core.RabbitTemplate">
    <property name="connectionFactory" ref="amqpConnectionFactory" />
    <property name="messageConverter" ref="marshallingMessageConverter"/>
</bean>

<bean id="marshallingMessageConverter" class="org.springframework.amqp.support.converter.MarshallingMessageConverter">
    <constructor-arg ref="jaxbMarshaller" />
</bean>

<oxm:jaxb2-marshaller id="jaxbMarshaller" context-path="com.my.package"/>

<rabbit:listener-container id="heartbeatListenerContainer" connection-factory="amqpConnectionFactory" auto-startup="false">
    <rabbit:listener ref="queueMessageHandler" queue-names="heartbeat-bdwh" />
</rabbit:listener-container>

<bean id="queueMessageHandler" class="com.my.package.QueueMessageHandler"/>

我正在努力找到这种延迟的原因。据我所知，它起源于Spring BlockingQueueConsumer。我不确定发生了什么以及为什么有另一个线程调用BlockingQueueConsumer.handleDelivery方法。

任何帮助都非常感激！

Answer 1

也许是网络问题？

默认配置一次处理1条消息，并且在发送确认之前，代理不会发送下一条消息。

尝试增加侦听器容器上的prefetch，以便在使用者线程准备就绪时容器始终有可用的消息。

查看网络跟踪（Wireshark或类似信息）。

修改

如果您的网络较差，并且可以承受重复交付的可能性增加，您还可以考虑增加txSize，以便不为每条消息发送确认消息。但请务必将其设置为小于prefetch的值。

为什么从填充的队列调度Spring AMQP消息会有延迟？

1 个答案: