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;

        
    void mockServer() throws InterruptedException, IOException {
        /*
         * Create an instance of the connection manager
         */
        QuorumPeer peer = new QuorumPeer(peers, tmpdir[0], tmpdir[0], port[0], 3, 0, 1000, 2, 2);
        cnxManager = new QuorumCnxManager(peer);
        QuorumCnxManager.Listener listener = cnxManager.listener;
        if(listener != null){
            listener.start();
        } else {

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    public void testCnxManager() throws Exception {
        CnxManagerThread thread = new CnxManagerThread();


        thread.start();
        
        QuorumPeer peer = new QuorumPeer(peers, peerTmpdir[1], peerTmpdir[1], peerClientPort[1], 3, 1, 1000, 2, 2);
        QuorumCnxManager cnxManager = new QuorumCnxManager(peer);
        QuorumCnxManager.Listener listener = cnxManager.listener;
        if(listener != null){
            listener.start();
        } else {

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                new QuorumServer(2,
                        new InetSocketAddress(deadAddress, deadPort),
                        new InetSocketAddress(deadAddress, PortAssignment.unique())));
        peerTmpdir[2] = ClientBase.createTmpDir();
    
        QuorumPeer peer = new QuorumPeer(peers, peerTmpdir[1], peerTmpdir[1], peerClientPort[1], 3, 1, 1000, 2, 2);
        QuorumCnxManager cnxManager = new QuorumCnxManager(peer);
        QuorumCnxManager.Listener listener = cnxManager.listener;
        if(listener != null){
            listener.start();
        } else {

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     * 
     * @throws Exception
     */
    @Test
    public void testCnxManagerSpinLock() throws Exception {               
        QuorumPeer peer = new QuorumPeer(peers, peerTmpdir[1], peerTmpdir[1], peerClientPort[1], 3, 1, 1000, 2, 2);
        QuorumCnxManager cnxManager = new QuorumCnxManager(peer);
        QuorumCnxManager.Listener listener = cnxManager.listener;
        if(listener != null){
            listener.start();
        } else {
            LOG.error("Null listener when initializing cnx manager");
        }
        
        int port = peers.get(peer.getId()).electionAddr.getPort();
        LOG.info("Election port: " + port);
        InetSocketAddress addr = new InetSocketAddress(port);
        
        Thread.sleep(1000);
        
        SocketChannel sc = SocketChannel.open();
        sc.socket().connect(peers.get(new Long(1)).electionAddr, 5000);
        
        /*
         * Write id first then negative length.
         */
        byte[] msgBytes = new byte[8];
        ByteBuffer msgBuffer = ByteBuffer.wrap(msgBytes);
        msgBuffer.putLong(new Long(2));
        msgBuffer.position(0);
        sc.write(msgBuffer);
        
        msgBuffer = ByteBuffer.wrap(new byte[4]);
        msgBuffer.putInt(-20);
        msgBuffer.position(0);
        sc.write(msgBuffer);
        
        Thread.sleep(1000);
        
        try{
            /*
             * Write a number of times until it
             * detects that the socket is broken.
             */
            for(int i = 0; i < 100; i++){
                msgBuffer.position(0);
                sc.write(msgBuffer);
            }
            Assert.fail("Socket has not been closed");
        } catch (Exception e) {
            LOG.info("Socket has been closed as expected");
        }
        peer.shutdown();
        cnxManager.halt();
    }

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    /*
     * Test if a receiveConnection is able to timeout on socket errors
     */
    @Test
    public void testSocketTimeout() throws Exception {
        QuorumPeer peer = new QuorumPeer(peers, peerTmpdir[1], peerTmpdir[1], peerClientPort[1], 3, 1, 2000, 2, 2);
        QuorumCnxManager cnxManager = new QuorumCnxManager(peer);
        QuorumCnxManager.Listener listener = cnxManager.listener;
        if(listener != null){
            listener.start();
        } else {
            LOG.error("Null listener when initializing cnx manager");
        }
        int port = peers.get(peer.getId()).electionAddr.getPort();
        LOG.info("Election port: " + port);
        InetSocketAddress addr = new InetSocketAddress(port);
        Thread.sleep(1000);
        
        Socket sock = new Socket();
        sock.connect(peers.get(new Long(1)).electionAddr, 5000);
        long begin = System.currentTimeMillis();
        // Read without sending data. Verify timeout.
        cnxManager.receiveConnection(sock);
        long end = System.currentTimeMillis();
        if((end - begin) > ((peer.getSyncLimit() * peer.getTickTime()) + 500)) Assert.fail("Waited more than necessary");
    }

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    @Test
    public void testWorkerThreads() throws Exception {
        ArrayList<QuorumPeer> peerList = new ArrayList<QuorumPeer>();


        for (int sid = 0; sid < 3; sid++) {
            QuorumPeer peer = new QuorumPeer(peers, peerTmpdir[sid], peerTmpdir[sid],
                                             peerClientPort[sid], 3, sid, 1000, 2, 2);
            LOG.info("Starting peer " + peer.getId());
            peer.start();
            peerList.add(sid, peer);
        }
        String failure = verifyThreadCount(peerList, 4);
        if (failure != null) {
            Assert.fail(failure);
        }
        for (int myid = 0; myid < 3; myid++) {
            for (int i = 0; i < 5; i++) {
                // halt one of the listeners and verify count
                QuorumPeer peer = peerList.get(myid);
                LOG.info("Round " + i + ", halting peer " + peer.getId());
                peer.shutdown();
                peerList.remove(myid);
                failure = verifyThreadCount(peerList, 2);
                if (failure != null) {
                    Assert.fail(failure);
                }


                // Restart halted node and verify count
                peer = new QuorumPeer(peers, peerTmpdir[myid], peerTmpdir[myid],
                                        peerClientPort[myid], 3, myid, 1000, 2, 2);
                LOG.info("Round " + i + ", restarting peer " + peer.getId());
                peer.start();
                peerList.add(myid, peer);
                failure = verifyThreadCount(peerList, 4);
                if (failure != null) {
                    Assert.fail(failure);
                }

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        }
        return failure;
    }
    public String _verifyThreadCount(ArrayList<QuorumPeer> peerList, long ecnt) {
        for (int myid = 0; myid < peerList.size(); myid++) {
            QuorumPeer peer = peerList.get(myid);
            QuorumCnxManager cnxManager = peer.getQuorumCnxManager();
            long cnt = cnxManager.getThreadCount();
            if (cnt != ecnt) {
                return new String(new Date()
                    + " Incorrect number of Worker threads for sid=" + myid
                    + " expected " + ecnt + " found " + cnt);

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            failed = false;
        }


        public void run(){
            try {
                QuorumPeer peer = new QuorumPeer(peers, peerTmpdir[0], peerTmpdir[0], peerClientPort[0], 3, 0, 1000, 2, 2);
                QuorumCnxManager cnxManager = new QuorumCnxManager(peer);
                QuorumCnxManager.Listener listener = cnxManager.listener;
                if(listener != null){
                    listener.start();
                } else {

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        }
        
        /*
         * peer1 and peer2 are A and B in the above example. 
         */
        QuorumPeer peer1 = new MockQuorumPeer(peers, tmpdir[0], tmpdir[0], port[0], 0, 0, 2, 2, 2);
        peer1.startLeaderElection();
        LEThread thread1 = new LEThread(peer1, 0);
        
        QuorumPeer peer2 = new MockQuorumPeer(peers, tmpdir[1], tmpdir[1], port[1], 0, 1, 2, 2, 2);
        peer2.startLeaderElection();        
        LEThread thread2 = new LEThread(peer2, 1);
                            
        /*
         * Start mock server.
         */

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            tmpdir[i] = ClientBase.createTmpDir();
            port[i] = PortAssignment.unique();
        }


        for(int i = 0; i < le.length; i++) {
            QuorumPeer peer = new QuorumPeer(peers, tmpdir[i], tmpdir[i],
                    port[i], 3, i, 1000, 2, 2);
            peer.startLeaderElection();
            LEThread thread = new LEThread(peer, i);
            thread.start();
            threads.add(thread);
        }
        LOG.info("Started threads " + getTestName());

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