Examples of org.apache.zookeeper.server.quorum.QuorumPeer

Package org.apache.zookeeper.server.quorum

Examples of org.apache.zookeeper.server.quorum.QuorumPeer

org.apache.zookeeper.server.quorum.QuorumPeer
This class manages the quorum protocol. There are three states this server can be in:
1. Leader election - each server will elect a leader (proposing itself as a leader initially).
2. Follower - the server will synchronize with the leader and replicate any transactions.
3. Leader - the server will process requests and forward them to followers. A majority of followers must log the request before it can be accepted.
This class will setup a datagram socket that will always respond with its view of the current leader. The response will take the form of:
```
 int xid; long myid; long leader_id; long leader_zxid; 
```
The request for the current leader will consist solely of an xid: int xid;


        /*
         * Start server 0
         */


        QuorumPeer peer = new QuorumPeer(peers, tmpdir[0], tmpdir[0], port[0], 3, 0, 1000, 2, 2);
        peer.startLeaderElection();
        FLETestUtils.LEThread thread = new FLETestUtils.LEThread(peer, 0);
        thread.start();  
        
        
        /*
         * Start mock server 1
         */
        QuorumPeer mockPeer = new QuorumPeer(peers, tmpdir[1], tmpdir[1], port[1], 3, 1, 1000, 2, 2);
        cnxManagers[0] = new QuorumCnxManager(mockPeer);
        QuorumCnxManager.Listener listener = cnxManagers[0].listener;
        listener.start();


        cnxManagers[0].toSend(0l, FLETestUtils.createMsg(ServerState.FOLLOWING.ordinal(), 0, 0, 1));
        
        /*
         * Start mock server 2
         */
        mockPeer = new QuorumPeer(peers, tmpdir[2], tmpdir[2], port[2], 3, 2, 1000, 2, 2);
        cnxManagers[1] = new QuorumCnxManager(mockPeer);
        listener = cnxManagers[1].listener;
        listener.start();


        cnxManagers[1].toSend(0l, FLETestUtils.createMsg(ServerState.FOLLOWING.ordinal(), 0, 0, 1));

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                if (peer != null) {
                    LOG.warn("Peer " + serverId + " already started");
                    return;
                }
                System.err.println("SnapDir = " + snapDir + " LogDir = " + logDir);
                peer = new QuorumPeer(peers, snapDir, logDir, clientAddr.getPort(), 0, serverId, tickTime, initLimit, syncLimit);
                peer.start();
                for(int i = 0; i < 5; i++) {
                    Thread.sleep(500);
                    try {
                        // Wait until we can connect

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    final static int syncLimit = 3;


    public void startServer(int index) throws IOException {
        int port = fakeBasePort+10+index;
        if (fakeMachines) {
            qps[index] = new QuorumPeer(peers, qpsDirs[index], qpsDirs[index], port, 0, index+1, tickTime, initLimit, syncLimit);
            qps[index].start();
        } else {
            try {
                QuorumPeerInstance.startInstance(im, quorumHostPort, index);
            } catch(Exception e) {

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            new InetSocketAddress("127.0.0.1", port2 + 3000)));
        peers.put(Long.valueOf(3), new QuorumServer(3, new InetSocketAddress("127.0.0.1", port3 + 1000),
            new InetSocketAddress("127.0.0.1", port3 + 2000),
            new InetSocketAddress("127.0.0.1", port3 + 3000)));


        QuorumPeer s2 = new QuorumPeer(peers, dataDir2, dataDir2, port2, 0, 2, tickTime, initLimit, syncLimit);
        s2.start();
        QuorumPeer s3 = new QuorumPeer(peers, dataDir3, dataDir3, port3, 0, 3, tickTime, initLimit, syncLimit);
        s3.start();
        connected = false;
        zk = new ZooKeeper("127.0.0.1:" + port2, 15000, nullWatcher);
        while(!connected) {
            Thread.sleep(1000);
        }
        for(int i = 0; i < 10; i++) {
            zk.create("/" + i, new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        }
        zk.close();
        
        final ZooKeeper zk2 = new ZooKeeper("127.0.0.1:" + port2, 15000, nullWatcher);
        zk2.getData("/9", false, new Stat());
        try {
            zk2.getData("/10", false, new Stat());
            Assert.fail("Should have gotten an error");
        } catch(KeeperException.NoNodeException e) {
            // this is what we want
        }
        QuorumPeer s1 = new QuorumPeer(peers, dataDir1, dataDir1, port1, 0, 1, tickTime, initLimit, syncLimit);
        s1.start();


        connected = false;
        ZooKeeper zk1 = new ZooKeeper("127.0.0.1:" + port1, 15000, nullWatcher);
        while(!connected) {
            Thread.sleep(1000);

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     * When all but the leader and one observer are shut down, the leader should
     * enter the 'looking' state, not stay in the 'leading' state.
     */
    @Test
    public void testLEWithObserver() throws Exception {
        QuorumPeer leader = null;
        for (QuorumPeer server : Arrays.asList(qb.s1, qb.s2, qb.s3)) {
            if (server.getServerState().equals(
                    QuorumStats.Provider.FOLLOWING_STATE)) {
                server.shutdown();
                assertTrue("Waiting for server down", ClientBase

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        HashMap<Long,QuorumServer> peers = new HashMap<Long,QuorumServer>();
        peers.put(Long.valueOf(1), new QuorumServer(1, new InetSocketAddress("127.0.0.1", port1 + 1000)));
        peers.put(Long.valueOf(2), new QuorumServer(2, new InetSocketAddress("127.0.0.1", port2 + 1000)));
        peers.put(Long.valueOf(3), new QuorumServer(3, new InetSocketAddress("127.0.0.1", port3 + 1000)));


        QuorumPeer s2 = new QuorumPeer(peers, dataDir2, dataDir2, port2, 0, 2, tickTime, initLimit, syncLimit);
        s2.start();
        QuorumPeer s3 = new QuorumPeer(peers, dataDir3, dataDir3, port3, 0, 3, tickTime, initLimit, syncLimit);
        s3.start();
        connected = false;
        zk = new ZooKeeper("127.0.0.1:" + port2, 15000, nullWatcher);
        while(!connected) {
            Thread.sleep(1000);
        }
        for(int i = 0; i < 10; i++) {
            zk.create("/" + i, new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        }
        zk.close();
        
        final ZooKeeper zk2 = new ZooKeeper("127.0.0.1:" + port2, 15000, nullWatcher);
        zk2.getData("/9", false, new Stat());
        try {
            zk2.getData("/10", false, new Stat());
            fail("Should have gotten an error");
        } catch(KeeperException.NoNodeException e) {
            // this is what we want
        }
        QuorumPeer s1 = new QuorumPeer(peers, dataDir1, dataDir1, port1, 0, 1, tickTime, initLimit, syncLimit);
        s1.start();


        connected = false;
        ZooKeeper zk1 = new ZooKeeper("127.0.0.1:" + port1, 15000, nullWatcher);
        while(!connected) {
            Thread.sleep(1000);

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                }
                if (peer != null) {
                    LOG.warn("Peer " + serverId + " already started");
                    return;
                }
                peer = new QuorumPeer(peers, snapDir, logDir, clientAddr.getPort(), 0, serverId, tickTime, initLimit, syncLimit);
                peer.start();
                for(int i = 0; i < 5; i++) {
                    Thread.sleep(500);
                    try {
                        // Wait until we can connect

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            peers.get(Long.valueOf(4)).type = LearnerType.OBSERVER;        
            peers.get(Long.valueOf(5)).type = LearnerType.OBSERVER;
        }


        LOG.info("creating QuorumPeer 1 port " + port1);
        s1 = new QuorumPeer(peers, s1dir, s1dir, port1, 3, 1, tickTime, initLimit, syncLimit);
        Assert.assertEquals(port1, s1.getClientPort());
        LOG.info("creating QuorumPeer 2 port " + port2);
        s2 = new QuorumPeer(peers, s2dir, s2dir, port2, 3, 2, tickTime, initLimit, syncLimit);
        Assert.assertEquals(port2, s2.getClientPort());
        LOG.info("creating QuorumPeer 3 port " + port3);
        s3 = new QuorumPeer(peers, s3dir, s3dir, port3, 3, 3, tickTime, initLimit, syncLimit);
        Assert.assertEquals(port3, s3.getClientPort());
        LOG.info("creating QuorumPeer 4 port " + port4);
        s4 = new QuorumPeer(peers, s4dir, s4dir, port4, 3, 4, tickTime, initLimit, syncLimit);
        Assert.assertEquals(port4, s4.getClientPort());
        LOG.info("creating QuorumPeer 5 port " + port5);
        s5 = new QuorumPeer(peers, s5dir, s5dir, port5, 3, 5, tickTime, initLimit, syncLimit);
        Assert.assertEquals(port5, s5.getClientPort());
        
        if (withObservers) {
            s4.setLearnerType(LearnerType.OBSERVER);
            s5.setLearnerType(LearnerType.OBSERVER);

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        }
        
        switch(i){
        case 1:
            LOG.info("creating QuorumPeer 1 port " + port1);
            s1 = new QuorumPeer(peers, s1dir, s1dir, port1, 3, 1, tickTime, initLimit, syncLimit);
            Assert.assertEquals(port1, s1.getClientPort());
            break;
        case 2:
            LOG.info("creating QuorumPeer 2 port " + port2);
            s2 = new QuorumPeer(peers, s2dir, s2dir, port2, 3, 2, tickTime, initLimit, syncLimit);
            Assert.assertEquals(port2, s2.getClientPort());
            break;
        case 3:  
            LOG.info("creating QuorumPeer 3 port " + port3);
            s3 = new QuorumPeer(peers, s3dir, s3dir, port3, 3, 3, tickTime, initLimit, syncLimit);
            Assert.assertEquals(port3, s3.getClientPort());
            break;
        case 4:
            LOG.info("creating QuorumPeer 4 port " + port4);
            s4 = new QuorumPeer(peers, s4dir, s4dir, port4, 3, 4, tickTime, initLimit, syncLimit);
            Assert.assertEquals(port4, s4.getClientPort());
            break;
        case 5:
            LOG.info("creating QuorumPeer 5 port " + port5);
            s5 = new QuorumPeer(peers, s5dir, s5dir, port5, 3, 5, tickTime, initLimit, syncLimit);
            Assert.assertEquals(port5, s5.getClientPort());
        }
    }

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        /*
         * Start server 0
         */
            
        QuorumPeer peer = new QuorumPeer(peers, tmpdir[1], tmpdir[1], port[1], 3, 1, 1000, 2, 2);
        peer.startLeaderElection();
        LEThread thread = new LEThread(peer, 1);
        thread.start();
            
        /*
         * Start mock server 1

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