Completed version 1.0.0 of HPDOS. Benchmarking remaining.

code/hpdos_rdma_sal/app.config

 app.HOST=192.168.200.20
-app.NO_OF_MASTERS=2
-app.MASTER_HOST1=192.168.200.20
-app.MASTER_HOST2=192.168.200.40
+app.NO_OF_MASTERS=1
+app.MASTER_HOST1=192.168.200.21
+#app.MASTER_HOST2=192.168.200.41
 app.INVALIDATION_PORT=1922
 app.CACHE_SIZE=1

code/hpdos_rdma_sal/src/main/java/MetadataClient.java

@@ -39,8 +39,9 @@ public class MetadataClient{
         // String metadataMasterIp = String.valueOf((String)properties.get("app.MASTER_HOST1"));
         int cacheSize = Integer.valueOf((String)properties.get("app.CACHE_SIZE")); 
         int numberOfMasters = Integer.valueOf((String)properties.get("app.NO_OF_MASTERS"));
+        int invalidationServerPort = Integer.valueOf((String)properties.get("app.INVALIDATION_PORT"));
         this.networkHandler = new NetworkHandler(cacheSize, numberOfMasters);
-        this.invalidationServer = new InvalidationServer(cache,invalidationServerIP, this.networkHandler);
+        this.invalidationServer = new InvalidationServer(cache,invalidationServerIP, invalidationServerPort, this.networkHandler);
         this.invalidationServer.acceptInvalidationConnections(numberOfMasters);
         for(int i=1;i<=numberOfMasters;i++){
             metadataMasters.add(String.valueOf((String)properties.get("app.MASTER_HOST"+i)));
@@ -57,8 +58,10 @@ public class MetadataClient{
             NetworkHandler.ips.add(metadataMasterIp);
             System.out.println("Connected");
         }
+        this.networkHandler.connectToFollowers();
+        this.networkHandler.initializeLoadBalancer();
         this.cache = Caffeine.newBuilder()
-                                            .expireAfterWrite(30, TimeUnit.SECONDS)
+                                            .expireAfterWrite(300, TimeUnit.SECONDS)
                                             .maximumSize(cacheSize)
                                             .build();
         

code/hpdos_rdma_sal/src/main/java/hpdos/handlers/NetworkHandler.java

@@ -2,6 +2,7 @@ package hpdos.handlers;
 import java.io.IOException;
 import java.net.InetSocketAddress;
 import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
@@ -34,7 +35,11 @@ import hpdos.protocol.RpcProtocol;
 public class NetworkHandler {
 
     public static LinkedHashMap<String, DaRPCStream<Request, Response>> streams = new LinkedHashMap<String, DaRPCStream<Request, Response>>();
-    public static LinkedList<String> ips =  new LinkedList<>();
+    public static List<String> ips =  new ArrayList<>();
+    public static HashMap<String, List<String>> follower_ips = new HashMap<>();
+    public static HashMap<String, List<DaRPCStream<Request, Response>>> followerStreams = new HashMap<>();
+    public HashMap<String, Integer> loadBalancer = new HashMap<>();
+    
     public int numberOfMasters;
     public Cache<String, String> cache;
 
@@ -90,10 +95,28 @@ public class NetworkHandler {
         // Partitioning
         int masterPartition = partition(key);
         String ip = NetworkHandler.ips.get(masterPartition);
-
+        DaRPCStream<Request, Response> stream = null;
         // Load balancing - TODO
-
-        DaRPCStream<Request, Response> stream = NetworkHandler.streams.get(ip);
+        int val = loadBalancer.get(ip);
+        if (val == 0) {
+            stream = NetworkHandler.streams.get(ip);
+            val = val + 1 ;
+            loadBalancer.put(ip, val);
+        } 
+        else 
+        {
+            
+            List<DaRPCStream<Request, Response>> temp = NetworkHandler.followerStreams.get(ip);
+            
+            stream = temp.get(val - 1);
+            val = val + 1;
+            
+            if (val - 1 == temp.size()) {
+                val = 0;
+            }
+            System.out.println("Putting val "+val);
+            loadBalancer.put(ip, val);
+        }
         stream.request(request, response, false).get();
 
         if(response.getAck() == AckType.SUCCESS_WITH_VALUE){
@@ -116,13 +139,12 @@ public class NetworkHandler {
         
         Response response = new Response();
        // Partitioning
-       int masterPartition = partition(key);
-       String ip = NetworkHandler.ips.get(masterPartition);
-
-       // Load balancing - TODO
+        int masterPartition = partition(key);
+        String ip = NetworkHandler.ips.get(masterPartition);
 
-       DaRPCStream<Request, Response> stream = NetworkHandler.streams.get(ip);
-       stream.request(request, response, false).get();
+        
+        DaRPCStream<Request, Response> stream = NetworkHandler.streams.get(ip);    
+        stream.request(request, response, false).get();
 
         if(response.getAck() == AckType.SUCCESS){
             this.cache.put(new String(key), new String(value));
@@ -200,9 +222,38 @@ public class NetworkHandler {
 
     public int partition(byte[] key)
     {
+        String str_key =  new String(key).trim();
         int hash = 7;
-        hash = 31 * hash + (key == null ? 0 : key.hashCode());
+        hash = 31 * hash + (str_key == null ? 0 : str_key.hashCode());
+//	System.out.println("key: " + str_key);
+//	System.out.println("key size" + str_key.length());
+//	System.out.println("number of masters: " + numberOfMasters);
+//	System.out.println("Calculated hash: "+ hash % numberOfMasters );
         return hash % numberOfMasters;
     }
 
+    public void connectToFollowers() throws Exception{
+        System.out.println("Beginning to connect to followers");
+        for (String key : NetworkHandler.follower_ips.keySet()) {
+            List<String> temp = follower_ips.get(key);
+            List<DaRPCStream<Request, Response>> tempStreams = new ArrayList<>();
+            for (String ip : temp) {
+                RpcProtocol rpcProtocol = new RpcProtocol();
+                DaRPCClientGroup<Request, Response> group = DaRPCClientGroup.createClientGroup(rpcProtocol, 100, 0, 16, 16); 
+                InetSocketAddress address = new InetSocketAddress(ip, 1921);
+                DaRPCClientEndpoint<Request, Response> clientEp = group.createEndpoint();
+                clientEp.connect(address, 1000);
+                DaRPCStream<Request, Response> followerStream = clientEp.createStream();
+                tempStreams.add(followerStream);
+            }
+            NetworkHandler.followerStreams.put(key, tempStreams);
+        }
+    }
+
+    public void initializeLoadBalancer() {
+        for (String ip : NetworkHandler.followerStreams.keySet()) {
+            this.loadBalancer.put(ip, 0);
+        }
+    }
+
 }

code/hpdos_rdma_sal/src/main/java/hpdos/invalidationServer/InvalidationServer.java

 package hpdos.invalidationServer;
 
 import java.io.IOException;
+import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.Socket;
-
+import java.util.ArrayList;
+import java.util.List;
+import hpdos.packet.*;
 import com.github.benmanes.caffeine.cache.Cache;
 import com.ibm.darpc.DaRPCServerEndpoint;
 import com.ibm.darpc.DaRPCServerGroup;
@@ -20,7 +23,7 @@ public class InvalidationServer
 {
     Cache<String, String> cache;
     RdmaServerEndpoint<DaRPCServerEndpoint<InvalidationRequest, InvalidationResponse>> serverEp;
-    public InvalidationServer(Cache<String, String> cache2,String invalidationServerIP, NetworkHandler networkHandler)throws Exception
+    public InvalidationServer(Cache<String, String> cache2,String invalidationServerIP, int invalidationServerPort,  NetworkHandler networkHandler)throws Exception
     {
             this.cache = cache2; 
             long[] clusterAffinities =  new long[1];
@@ -30,7 +33,7 @@ public class InvalidationServer
 
             group = DaRPCServerGroup.createServerGroup(service, clusterAffinities, -1, 1, true, 2, 2, 2, 1);    
             serverEp = group.createServerEndpoint();
-            InetSocketAddress address = new InetSocketAddress(invalidationServerIP, 1922);
+            InetSocketAddress address = new InetSocketAddress(invalidationServerIP, invalidationServerPort);
             serverEp.bind(address, 2);
     }
     public void acceptInvalidationConnections(int numOfConnections) throws Exception
@@ -58,12 +61,40 @@ public class InvalidationServer
        
     }
 
-    public void sendInvalidationRegistrationRequest(String masterIpAddress, String hostIpAddress) throws IOException{
-        System.out.println("Sending invalidation registration request.");
+    public void sendInvalidationRegistrationRequest(String masterIpAddress, String hostIpAddress) throws IOException, ClassNotFoundException{
+        System.out.println("Sending invalidation registration request to ." + masterIpAddress);
         Socket socket = new Socket(masterIpAddress, 9875);
-        ObjectOutputStream oos = null;
-        oos = new ObjectOutputStream(socket.getOutputStream());
+        ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
         oos.writeObject(hostIpAddress);
+
+        ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
+        // List<Follower> followers = (List<Follower>) ois.readObject();
+        String ips = (String) ois.readObject();
+        String[] follower_ips = ips.split(";");
+        String master = follower_ips[0];
+        
+        List<String> temp = new ArrayList<>();
+        int index = 0;
+        for (String ip : follower_ips) {
+            if (index == 0) {
+                index++;
+                continue;
+            }
+            temp.add(ip);
+            index++;
+        }
+        NetworkHandler.follower_ips.put(master, temp);
+        for (String string : NetworkHandler.follower_ips.keySet()) {
+            System.out.println("For master: " + string + " the followers are: ");
+            for (String string2 : NetworkHandler.follower_ips.get(string)) {
+                System.out.println(string2);
+            }    
+        }
+        
+        // for (Follower follower : followers) {
+        //     System.out.println(follower.getIpAdress());
+        // }
+
         socket.close();
     }