private String getConsumerKey(String group, String consumerId) {
        return new StringBuilder(512).append(consumerId)
                .append("@").append(group).toString();
    }
Generate consumer id

@param group
@param consumerId
@return
inlong-tubemq/tubemq-server/src/main/java/org/apache/inlong/tubemq/server/master/TMaster.java