Apache camel 驼峰MQTT组件-动态端点的数量有限？

我们正在使用Camel MQTT组件订阅几个主题并执行路由逻辑

在某些情况下，我们使用动态端点在运行时设置发布主题名称，该名称最多可用于15个并发连接的端点

一旦创建第16个动态端点（toD（）-call），连接到mqtt代理时就会出现超时

org.apache.camel.FailedToCreateProducerException: Failed to create Producer for endpoint: <my connection here>&connectAttemptsMax=1&reconnectAttemptsMax=1&publishTopicName=<topic>. Reason: java.util.concurrent.TimeoutException
    at org.apache.camel.impl.ProducerCache.doGetProducer(ProducerCache.java:579) ~[camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.impl.ProducerCache.doInAsyncProducer(ProducerCache.java:406) ~[camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.processor.SendDynamicProcessor.process(SendDynamicProcessor.java:119) ~[camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77) ~[camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:542) ~[camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:197) [camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:120) ~[camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:83) ~[camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:197) [camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.component.mqtt.MQTTConsumer.processExchange(MQTTConsumer.java:51) [camel-mqtt-2.18.3.jar:2.18.3]
    at org.apache.camel.component.mqtt.MQTTEndpoint$2.onPublish(MQTTEndpoint.java:257) [camel-mqtt-2.18.3.jar:2.18.3]
    at org.fusesource.mqtt.client.CallbackConnection$8.onPublish(CallbackConnection.java:521) [mqtt-client-1.14.jar:1.14]
    at org.fusesource.mqtt.client.CallbackConnection.toReceiver(CallbackConnection.java:911) [mqtt-client-1.14.jar:1.14]
    at org.fusesource.mqtt.client.CallbackConnection.processFrame(CallbackConnection.java:808) [mqtt-client-1.14.jar:1.14]
    at org.fusesource.mqtt.client.CallbackConnection.access$1700(CallbackConnection.java:73) [mqtt-client-1.14.jar:1.14]
    at org.fusesource.mqtt.client.CallbackConnection$6.onTransportCommand(CallbackConnection.java:425) [mqtt-client-1.14.jar:1.14]
    at org.fusesource.hawtdispatch.transport.TcpTransport.drainInbound(TcpTransport.java:713) [hawtdispatch-transport-1.22.jar:1.22]
    at org.fusesource.hawtdispatch.transport.TcpTransport$6.run(TcpTransport.java:592) [hawtdispatch-transport-1.22.jar:1.22]
    at org.fusesource.hawtdispatch.internal.NioDispatchSource$3.run(NioDispatchSource.java:209) [hawtdispatch-1.22.jar:1.22]
    at org.fusesource.hawtdispatch.internal.SerialDispatchQueue.run(SerialDispatchQueue.java:100) [hawtdispatch-1.22.jar:1.22]
    at org.fusesource.hawtdispatch.internal.pool.SimpleThread.run(SimpleThread.java:77) [hawtdispatch-1.22.jar:1.22]
Caused by: java.util.concurrent.TimeoutException: null
    at org.fusesource.mqtt.client.Promise.await(Promise.java:83) ~[mqtt-client-1.14.jar:1.14]
    at org.apache.camel.component.mqtt.MQTTEndpoint.connect(MQTTEndpoint.java:342) ~[camel-mqtt-2.18.3.jar:2.18.3]
    at org.apache.camel.component.mqtt.MQTTProducer.doStart(MQTTProducer.java:38) ~[camel-mqtt-2.18.3.jar:2.18.3]
    at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61) ~[camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.util.ServiceHelper.startService(ServiceHelper.java:75) ~[camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.impl.DefaultCamelContext.deferStartService(DefaultCamelContext.java:1316) ~[camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.impl.DefaultCamelContext.doAddService(DefaultCamelContext.java:1244) ~[camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.impl.DefaultCamelContext.addService(DefaultCamelContext.java:1214) ~[camel-core-2.18.3.jar:2.18.3]
    at org.apache.camel.impl.ProducerCache.doGetProducer(ProducerCache.java:577) ~[camel-core-2.18.3.jar:2.18.3]
    ... 20 common frames omitted

org.apache.camel.FailedToCreateProducerException:未能为端点创建生产者：&connectAttemptsMax=1&reconnectAttemptsMax=1&publishTopicName=。原因：java.util.concurrent.TimeoutException
在org.apache.camel.impl.ProducerCache.doGetProducer（ProducerCache.java:579）~[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.impl.ProducerCache.doInAsyncProducer（ProducerCache.java:406）~[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.processor.SendDynamicProcessor.process（SendDynamicProcessor.java:119）~[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.management.InstrumentationProcessor.process（InstrumentationProcessor.java:77）~[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.processor.redeliveryrorhandler.process（redeliveryrorhandler.java:542）~[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.processor.CamelInternalProcessor.process（CamelInternalProcessor.java:197）[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.processor.Pipeline.process（Pipeline.java:120）~[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.processor.Pipeline.process（Pipeline.java:83）~[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.processor.CamelInternalProcessor.process（CamelInternalProcessor.java:197）[camel-core-2.18.3.jar:2.18.3]
位于org.apache.camel.component.mqtt.MQTTConsumer.processExchange（MQTTConsumer.java:51）[camel-mqtt-2.18.3.jar:2.18.3]
在org.apache.camel.component.mqtt.MQTTEndpoint$2.onPublish（MQTTEndpoint.java:257）[camel-mqtt-2.18.3.jar:2.18.3]
在org.fusesource.mqtt.client.CallbackConnection$8.onPublish（CallbackConnection.java:521）[mqtt-client-1.14.jar:1.14]
在org.fusesource.mqtt.client.CallbackConnection.toReceiver（CallbackConnection.java:911）[mqtt-client-1.14.jar:1.14]
在org.fusesource.mqtt.client.CallbackConnection.processFrame（CallbackConnection.java:808）[mqtt-client-1.14.jar:1.14]
在org.fusesource.mqtt.client.CallbackConnection.access$1700（CallbackConnection.java:73）[mqtt-client-1.14.jar:1.14]
在org.fusesource.mqtt.client.CallbackConnection$6.onTransportCommand（CallbackConnection.java:425）[mqtt-client-1.14.jar:1.14]
在org.fusesource.hawtdispatch.transport.tcpttransport.drainInbound（tcpttransport.java:713）[hawtdispatch-transport-1.22.jar:1.22]
在org.fusesource.hawtdispatch.transport.tcpttransport$6.run（tcpttransport.java:592）[hawtdispatch-transport-1.22.jar:1.22]
在org.fusesource.hawtdispatch.internal.NioDispatchSource$3.run（NioDispatchSource.java:209）[hawtdispatch1.22.jar:1.22]
在org.fusesource.hawtdispatch.internal.SerialDispatchQueue.run（SerialDispatchQueue.java:100）[hawtdispatch1.22.jar:1.22]
在org.fusesource.hawtdispatch.internal.pool.SimpleThread.run（SimpleThread.java:77）[hawtdispatch-1.22.jar:1.22]
原因：java.util.concurrent.TimeoutException:null
在org.fusesource.mqtt.client.Promise.await（Promise.java:83）~[mqtt-client-1.14.jar:1.14]
在org.apache.camel.component.mqtt.MQTTEndpoint.connect（MQTTEndpoint.java:342）~[camel-mqtt-2.18.3.jar:2.18.3]
在org.apache.camel.component.mqtt.MQTTProducer.doStart（MQTTProducer.java:38）~[camel-mqtt-2.18.3.jar:2.18.3]
在org.apache.camel.support.ServiceSupport.start（ServiceSupport.java:61）~[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.util.ServiceHelper.startService（ServiceHelper.java:75）~[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.impl.DefaultCamelContext.deferStartService（DefaultCamelContext.java:1316）~[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.impl.DefaultCamelContext.doAddService（DefaultCamelContext.java:1244）~[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.impl.DefaultCamelContext.addService（DefaultCamelContext.java:1214）~[camel-core-2.18.3.jar:2.18.3]
在org.apache.camel.impl.ProducerCache.doGetProducer（ProducerCache.java:577）~[camel-core-2.18.3.jar:2.18.3]
... 省略20个公共框架

如果Mqtt组件的并发连接端点是在运行时创建的，那么这些端点是否有限制

静态端点似乎没有限制。我们能够启动超过15条路由，其中端点订阅主题并使用消息

更新：作为一个后备方案，我们尝试使用camel-paho组件，它与相同的代理设置和动态主题一起工作

---

对此问题有何帮助？

虽然这可能是

驼峰mqtt

组件的一个限制，但您可以使用一个端点并在标题中动态设置发布主题。
建议使用CamelMQTTPublishTopic标题（从Camel 2.14开始），因此您的路线可能如下

<route>
    <from uri="direct:start" />
    <to uri="bean:publishTopicProcessor" />
    <to uri="mqtt:singleEndpoint" />
</route>

现在，单一端点将在不同主题上发布您的消息

---

我在使用Camel 2.18时做了完全相同的事情，是的，这解决了问题。谢谢你的帮助。我以前尝试过这种头方法，但不幸的是使用了toD（）-调用，这导致了相同的问题：-(

public void process(Exchange exchange) {
    String dynamicTopic = "your/dynamic/topic";
    // set the topic you want in the string
    exchange.getIn().setHeader("CamelMQTTPublishTopic", dynamicTopic);
}