private AllocatedHosts readAllocatedHosts() {
        try {
            return AllocatedHostsSerializer.fromJson(zkApplication.getBytes(Path.fromString(allocatedHostsNode)));
        } catch (Exception e) {
            throw new RuntimeException("Unable to read allocated hosts", e);
        }
    }
Reads allocated hosts at the given node.

@return the allocated hosts at this node or empty if there is no data at this path
configserver/src/main/java/com/yahoo/vespa/config/server/zookeeper/ZKApplicationPackage.java