kangjiabang opened a new issue #1188: Tracer start failed when starting multiple MqProducer in one process URL: https://github.com/apache/rocketmq/issues/1188 i want to use trace feature in 4.4.0. when i init two defaultMQProducer ， use new DefaultMQProducer(producerId,true); then i start to send message to test trace， trace not work well。 i find when producer start with trace on，it will produce new AsyncTraceDispatcher，in AsyncTraceDispatcher, it will invoke getAndCreateTraceProducer method. `private DefaultMQProducer getAndCreateTraceProducer(RPCHook rpcHook) { DefaultMQProducer traceProducerInstance = this.traceProducer; if (traceProducerInstance == null) { traceProducerInstance = new DefaultMQProducer(rpcHook); traceProducerInstance.setProducerGroup(TraceConstants.GROUP_NAME); traceProducerInstance.setSendMsgTimeout(5000); traceProducerInstance.setVipChannelEnabled(false); // The max size of message is 128K traceProducerInstance.setMaxMessageSize(maxMsgSize - 10 * 1000); } return traceProducerInstance; }` but the ProducerGroup is same for all trace Producer . when i start two MQProducer ,i will report error like following . `throw new MQClientException("The producer group[" + this.defaultMQProducer.getProducerGroup() + "] has been created before, specify another name please." + FAQUrl.suggestTodo(FAQUrl.GROUP_NAME_DUPLICATE_URL), null);`
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