RocketMq在一个JVM上只能注册一次

public class MQClientInstance {
    private final static long LOCK_TIMEOUT_MILLIS = 3000;
    private final InternalLogger log = ClientLogger.getLog();
    private final ClientConfig clientConfig;
    private final int instanceIndex;
    private final String clientId;
    private final long bootTimestamp = System.currentTimeMillis();
    private final ConcurrentMap<String/* group */, MQProducerInner> producerTable = new ConcurrentHashMap<String, MQProducerInner>();
    private final ConcurrentMap<String/* group */, MQConsumerInner> consumerTable = new ConcurrentHashMap<String, MQConsumerInner>();
    private final ConcurrentMap<String/* group */, MQAdminExtInner> adminExtTable = new ConcurrentHashMap<String, MQAdminExtInner>();

注意consumerTable的结构 ，注意是一个JVM上，每一个消费组都只能有一个consumer