discovery/seata-discovery-consul/src/main/java/org/apache/seata/discovery/registry/consul/ConsulRegistryServiceImpl.java [164:172]:
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    public List<InetSocketAddress> lookup(String key) throws Exception {
        transactionServiceGroup = key;
        final String cluster = getServiceGroup(key);
        if (cluster == null) {
            String missingDataId = PREFIX_SERVICE_ROOT + CONFIG_SPLIT_CHAR + PREFIX_SERVICE_MAPPING + key;
            throw new ConfigNotFoundException("%s configuration item is required", missingDataId);
        }
        return lookupByCluster(cluster);
    }
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discovery/seata-discovery-etcd3/src/main/java/org/apache/seata/discovery/registry/etcd3/EtcdRegistryServiceImpl.java [185:193]:
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    public List<InetSocketAddress> lookup(String key) throws Exception {
        transactionServiceGroup = key;
        final String cluster = getServiceGroup(key);
        if (cluster == null) {
            String missingDataId = PREFIX_SERVICE_ROOT + CONFIG_SPLIT_CHAR + PREFIX_SERVICE_MAPPING + key;
            throw new ConfigNotFoundException("%s configuration item is required", missingDataId);
        }
        return lookupByCluster(cluster);
    }
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