leoxchang opened a new issue #1619: use two DefaultMQPushConsumer listen two topics, only one topic can get message trace URL: https://github.com/apache/rocketmq/issues/1619 I used two DefaultMQPushConsumer listen two topics, that from one "nameSrv";only one topic can get message trace. I debug the rocketmq client source,I see that "AsyncTraceDispatcher.start" method throws MQClientException,because the traceProducer has bean created,the "MQ-AsyncTraceDispatcher-Thread-" thread can not start. so one DefaultMQPushConsumer can not send trace message. 当使用两个”DefaultMQPushConsumer“ 监听同一个服务地址的topic时，只有其中的一个topic是可以查询到消息轨迹的，我debug源码发现"AsyncTraceDispatcher.start"这个方法抛出了MQClientException，原因是traceProducer 已经被创建过了，所以"MQ-AsyncTraceDispatcher-Thread" 线程没有被启动，导致其中的一个DefaultMQPushConsumer没法发送trace消息。
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