public boolean isDownTopicConfEmpty() {
        return this.syncDownTopicConfInfoMap.isEmpty();
    }
whether the broker data is synchronized

@return true: the configure is synchronized;
        false: not synchronized
inlong-tubemq/tubemq-server/src/main/java/org/apache/inlong/tubemq/server/master/nodemanage/nodebroker/BrokerSyncData.java