rmi

I am trying to understand how Apache Spark works behind the scenes. After coding a little in Spark I am pretty quite sure that it implements the RDD as RMI Remote objects , doesn't it? In this way, it can modify them inside transformation, such as map s, flatMap s, and so on. Object that are not part of an RDD are simply serialized and sent to a worker during execution. In the example below, lines and tokens will be treated as remote objects , while the string toFind will be simply serialized and copied to the workers. val lines: RDD[String] = sc.textFile("large_file.txt") val toFind = "Some

The Question: When you UnicastRemoteObject.exportObject(instance) . Does that instance now become publicly available to all clients. Even if a little tricky is required to find its port. This is the situation: I have a java RMI client/server setup and I wanted to add some authentication. Allowing the client to user a user/pass combo before any of the other RPC calls work. I found a simple suggestion online that looked like a good idea at first. interface LoginService implements Remote { public MainService login(String username, char[] password) throws RemoteException; } interface MainService

Using RMI to pass String object from WebAppA to WebAppB.WebAppB is the RMIServer whereas WebAppA is RMIClient.I have added ContextListener in WebAppB, so that the rmi service starts right away when the context is initialized in tomcat.And in the contextDestroyed method of tomcat I am trying to close/shut down rmi using the following statements: unexportObject(remoteObj,true); LocateRegistry.getRegistry(3232).unbind("MessagePath"); //MessagePath - name of the remote reference But even after the execution of the aforeseen statements, rmi is listening for incoming requests at port 3232.I saw that

I'm implementing a simple RMI Server Client program in JAVA. I'm new to this actually. i have four java files. Stack.java import java.rmi.*; public interface Stack extends Remote{ public void push(int p) throws RemoteException; public int pop() throws RemoteException; } StackImp.java import java.rmi.*; import java.rmi.server.*; public class StackImp extends UnicastRemoteObject implements Stack{ private int tos, data[], size; public StackImp()throws RemoteException{ super(); } public StackImp(int s)throws RemoteException{ super(); size = s; data = new int[size]; tos=-1; } public void push(int p

On Oracle's FAQ page about Java RMI, it says: While the Java Remote Method Invocation (Java RMI) server can theoretically be on any host, it is usually the same host as that on which the registry is running, and on a different port. Even if the server is mistaken about its hostname or IP address (or has a hostname that simply isn't resolvable by clients), it will still export all of its objects using that mistaken hostname, but you will see an exception every time you try to receive one of those objects. I don't understand the difference between the RMI Server and the RMI Registry. I thought