具有多个使用者的JMS队列 [英] JMS queue with multiple consumers
问题描述
我有一个带HornetQ的JBoss-6服务器和一个队列：
I have a JBoss-6 server with HornetQ and a single queue:
<queue name="my.queue">
<entry name="/queue/test"/>
</queue>
有一个不同的消费者（在不同的机器上）连接到这个队列，但只有一个单个消费者一次是活跃的。如果我关闭此消费者，消息会立即由其他消费者处理。
There a different consumers (on different machines) connected to this queue, but only a single consumer is active at a time. If I shut down this consumer, the messages are immediately processed by one of the other consumers.
由于我的消息有一些耗时的处理，我希望多个消费者处理他们独特的消息同时发生。
Since my messages have some time consuming processing, I want multiple consumer process their unique messages concurrently.
我记得在早期版本的JBoss中有类似的情况，这种设置没有问题。在Jboss-6中，消息传递系统运行良好 - 除了上述问题。这个问题类似于在hornetq中可能有多个客户端消费者吗？，但这种情况与我的情况不同。
I remember a similar in earlier versions of JBoss where this setup worked without problems. Here in Jboss-6 the messaging system is working well -- except of the issue described above. This question is similar to Are multiple client consumers possible in hornetq?, but the scenario is not similar to mine.
更新1 ：如果我关闭（STRG + C）一个消费者，则会有一个短暂的超时（直到服务器识别出丢失的消费者），直到下一个消费者获得消息。
Update 1: If I close (STRG+C) one consumer there is a short timeout (until the server recognized the lost consumer) until the next consumer gets the message.
更新2 ：代码段
VoidListener ml = new VoidListener();
QueueConnectionFactory qcf = (QueueConnectionFactory)
ctx.lookup("ConnectionFactory");
QueueConnection conn = qcf.createQueueConnection();
Queue queue = (Queue) ctx.lookup(queueName);
QueueSession session = conn.createQueueSession(false,
QueueSession.AUTO_ACKNOWLEDGE);
QueueReceiver recv = session.createReceiver(queue,"");
recv.setMessageListener(ml);
conn.start();
和MessageListerner：
And the MessageListerner:
public class OlVoidListener implements MessageListener
{
public void onMessage(Message msg)
{
counter++;
logger.debug("Message ("+counter+") received");
try {Thread.sleep(15*1000);} catch (InterruptedException e) {}
}
}
推荐答案
队列中有多个消费者，消费者之间的消息负载均衡。
With multiple consumers on a queue, messages are load balanced between the consumers.
由于你有时间消息，你应该通过设置消费者窗口大小来禁用缓冲。
As you have some time consuming the message, you should disable buffering by setting consumer-window-size.
在hornetQ上有一个关于分发的例子，关于如何禁用客户端缓冲并为慢速消费者提供更好的支持。 （一个缓慢的消费者是一个消费者，它将有一些时间处理消息）
On hornetQ there's an example on the distribution, about how to disable client buffering and give a better support for slow consumers. (a slow consumer is a consumer that will have some time processing the message)
消息系统将预取/预读消息到客户端缓冲区以加速处理并避免网络延迟。如果您有快速处理队列和单个消费者，这不是问题。
message systems will pre-fetch/read-ahead messages to the client buffer to speed up processing and avoid network latency. This is not an issue if you have fast processing queues and a single consumer.
JBoss Messaging在连接工厂提供了慢消费者选项，而hornetq提供了消费者窗口大小。
JBoss Messaging offered the slow-consumer option at the connection factory and hornetq offers the consumer window size.
大多数消息系统将为您提供启用或禁用客户端预取的方法。
Most Message systems will provide you a way to enable or disable client pre-fetching.
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