@Override
    public List<Node> fetchNodes() {
        return new ArrayList<>(nodes);
    }
A simple implementation of `MetadataUpdater` that returns the cluster nodes set via the constructor or via
`setNodes`.

This is useful in cases where automatic metadata updates are not required. An example is controller/broker
communication.

This class is not thread-safe!
clients/src/main/java/org/apache/kafka/clients/ManualMetadataUpdater.java