Commit cf57854e authored by Ali Saeed's avatar Ali Saeed

Zookeeper reelection leader

parents
File added
LeaderElection.java
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package org.example;
import org.apache.zookeeper.*;
import org.apache.zookeeper.data.Stat;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
public class LeaderElection implements Watcher {
private static final String ADDRESS = "192.168.181.136:2181";
private static final int SESSION_TIMEOUT = 3000;
private static final String ELECTION_NAMESPACE = "/election";
private static final String LEADER_NODE_PREFIX = "leader-";
private String currentNodePath;
private String previousNodePath;
private ZooKeeper zooKeeper;
private Stat previousNodeStat;
public static void main(String[] args) throws IOException, InterruptedException, KeeperException {
LeaderElection leaderElection = new LeaderElection();
leaderElection.connectToZookeeper();
leaderElection.volunteerForLeadership();
leaderElection.electLeader();
leaderElection.run();
}
public void connectToZookeeper() throws IOException {
this.zooKeeper = new ZooKeeper(ADDRESS, SESSION_TIMEOUT, this);
}
public void run() {
synchronized (zooKeeper) {
try {
zooKeeper.wait(); // Wait for events
} catch (InterruptedException e) {
System.out.println(e.getMessage());
}
}
try {
zooKeeper.close();
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
public void volunteerForLeadership() throws InterruptedException, KeeperException {
String znodeFullPath = zooKeeper.create(
ELECTION_NAMESPACE + "/" + LEADER_NODE_PREFIX,
new byte[]{},
ZooDefs.Ids.OPEN_ACL_UNSAFE,
CreateMode.EPHEMERAL_SEQUENTIAL
);
System.out.println("Created znode: " + znodeFullPath);
this.currentNodePath = znodeFullPath.replace(ELECTION_NAMESPACE + "/", "");
}
public void electLeader() throws InterruptedException, KeeperException {
List<String> children = zooKeeper.getChildren(ELECTION_NAMESPACE, false);
Collections.sort(children);
int currentNodeIndex = children.indexOf(currentNodePath);
if (currentNodeIndex == 0) {
becomeLeader();
} else {
String previousNodeName = children.get(currentNodeIndex - 1);
previousNodePath = ELECTION_NAMESPACE + "/" + previousNodeName;
System.out.println("I'm not the leader, the leader is: " + children.get(0));
watchPreviousNode();
}
}
private void becomeLeader() throws KeeperException, InterruptedException {
System.out.println("I'm the leader");
// Notify other nodes that you are the leader
String leaderData = "Leader: " + currentNodePath;
zooKeeper.setData(ELECTION_NAMESPACE+"/"+currentNodePath, leaderData.getBytes(), -1);
}
private void watchPreviousNode() throws KeeperException, InterruptedException {
previousNodeStat = zooKeeper.exists(previousNodePath, this);
if (previousNodeStat != null) {
System.out.println("Watching previous node: " + previousNodePath);
}
}
private void setData() throws InterruptedException, KeeperException {
// Retrieve leader data from the previous leader's znode, because it contains our new leader
byte[] data = zooKeeper.getData(previousNodePath, this, previousNodeStat);
String leaderData = new String(data);
zooKeeper.setData(ELECTION_NAMESPACE+"/"+currentNodePath,data,-1);
System.out.println("Current leader: " + leaderData);
}
@Override
public void process(WatchedEvent watchedEvent) {
switch (watchedEvent.getType()) {
case None:
if (watchedEvent.getState() == Event.KeeperState.SyncConnected) {
System.out.println("Successfully connected to ZooKeeper");
} else if (watchedEvent.getState() == Event.KeeperState.Disconnected) {
System.out.println("Disconnected from ZooKeeper. Shutting down the program.");
synchronized (zooKeeper) {
zooKeeper.notifyAll();
}
}
break;
case NodeDeleted:
if (watchedEvent.getPath().equals(previousNodePath)) {
System.out.println("Previous leader node deleted. Attempting to become the new leader...");
try {
electLeader();
} catch (InterruptedException | KeeperException e) {
throw new RuntimeException(e);
}
}
break;
case NodeDataChanged:
if (watchedEvent.getPath().equals(previousNodePath)) {
System.out.println("Previous leader data changed. maybe we have a new leader .");
try {
setData();
} catch (InterruptedException | KeeperException e) {
throw new RuntimeException(e);
}
}
break;
default:
break;
}
}
}
\ No newline at end of file
Manifest-Version: 1.0
Main-Class: org.example.LeaderElection
Manifest-Version: 1.0
Main-Class: org.example.LeaderElection
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