public static ConfigDefinitionKey createConfigDefinitionKeyFromZKString(String nodeName) {
        final String name;
        final String namespace;
        String tempName = ConfigUtils.getNameFromSerializedString(nodeName); // includes namespace
        Tuple2<String, String> tuple = ConfigUtils.getNameAndNamespaceFromString(tempName);
        name = tuple.first;
        namespace = tuple.second;
        return new ConfigDefinitionKey(name, namespace);
    }
Creates a ConfigDefinitionKey from a string for the name of a node in ZooKeeper
that holds a config definition

@param nodeName name of  a node in ZooKeeper that holds a config definition
@return a ConfigDefinitionKey
config/src/main/java/com/yahoo/vespa/config/util/ConfigUtils.java