private void ensureDataIsNotTooLarge(byte[] toPut, Path path) {
        if (toPut.length >= maxNodeSize) {
            throw new IllegalArgumentException("Error: too much zookeeper data in node: "
                                               + "[" + toPut.length + " bytes] (path " + path + ")");
        }
    }
Retrieves a node relative to the node of the active application

@param path a path relative to the currently active application
@return a Reader that can be used to get the data
configserver/src/main/java/com/yahoo/vespa/config/server/zookeeper/ZKApplication.java