private static void Statistics(IList <Node> nodes, ConsistentHash <Node> cluster)
{
var statDict = new Dictionary <String, int>();
foreach (var n in nodes)
{
statDict.Add(n.IP, 0);
}
for (int i = 0; i < ItemCount; i++)
{
var node = cluster.GetNode($"key_{i}");
statDict[node.IP] += 1;
}
var mean = statDict.Values.Average();
var std = statDict.Values.StdDev();
Console.WriteLine(@$ "
Algorithm Statistics:
{cluster.ToString()}
--------------------
Total: {ItemCount:N0}
Mean: {mean:N0}
StdDev: {std:F2}
");
foreach (var(k, v) in statDict)
{
Console.WriteLine("Node [{0}]: {1}", k, v);
}
}
public static void FindNode(this ConsistentHash <Node> cluster, String[] keys)
{
foreach (var key in keys)
{
cluster.FindNode(key);
}
}
static void Main(string[] args)
{
List <Server> rackServers = new List <Server>();
rackServers.Add(new Server("10.0.0.1"));
rackServers.Add(new Server("10.0.0.2"));
int numberOfReplicas = 2;
ConsistentHash serverDistributor = new ConsistentHash(numberOfReplicas, rackServers);
//add a new server to the mix
Server newServer = new Server("10.0.0.3");
serverDistributor.addServerToHashRing(newServer);
//Assume you have a key "key0"
Server serverForKey = serverDistributor.GetServerForKey("key0");
Console.WriteLine("Server: " + serverForKey.ipAddress + " holds key: Key0");
// Now remove a server
serverDistributor.removeServerFromHashRing(newServer);
// Now check on which server "key0" landed up
serverForKey = serverDistributor.GetServerForKey("key0");
Console.WriteLine("Server: " + serverForKey.ipAddress + " holds key: Key0");
}
static void Main(string[] args)
{
IList <string> nodes = new List <string>();
for (int i = 0; i < 10; i++)
{
nodes.Add("Node#" + i);
}
ConsistentHash <string> consistentHash = new ConsistentHash <string>(nodes, 200);
consistentHash.ReportToFile();
}
private static void TestAddOrRemove(ConsistentHash <Node> cluster)
{
var keys = new[] { "66778899", "hello world", "consistent hashing" };
cluster.FindNode(keys);
var newNode = new Node($"10.1.1.{NumberOfNodes}");
cluster.RemoveFromRing(newNode);
Console.WriteLine($"\nAfter removed a Node [{newNode}]:\n--------------------");
cluster.FindNode(keys);
cluster.AddToRing(newNode);
Console.WriteLine($"\nAfter added a new Node [{newNode}]:\n--------------------");
cluster.FindNode(keys);
}
static void Main(string[] args)
{
var nodes = new List <Node>();
for (int i = 1; i <= NumberOfNodes; i++)
{
nodes.Add(new Node($"10.1.1.{i}"));
}
var hashFuncs = new IHash[] { new MurmurHash3(4049661204), new MD5Hash(), new FNVHash() };
var serverCluster = new ConsistentHash <Node>(hashFuncs[0], NumberOfReplicas, nodes);
// serverCluster.Print();
TestAddOrRemove(serverCluster);
Statistics(nodes, serverCluster);
}
public static void FindNode(this ConsistentHash <Node> cluster, String key)
{
var found = cluster.GetNode(key);
Console.WriteLine($"Key [{key}] - Hash [{cluster.GetHashKey(key)}], route to Node [{found.IP}]");
}
