Examples of QuorumCnxManager

org.apache.zookeeper.server.quorum.QuorumCnxManager
This class implements a connection manager for leader election using TCP. It maintains one coonection for every pair of servers. The tricky part is to guarantee that there is exactly one connection for every pair of servers that are operating correctly and that can communicate over the network. If two servers try to start a connection concurrently, then the connection manager uses a very simple tie-breaking mechanism to decide which connection to drop based on the IP addressed of the two parties. For every peer, the manager maintains a queue of messages to send. If the connection to any particular peer drops, then the sender thread puts the message back on the list. As this implementation currently uses a queue implementation to maintain messages to send to another peer, we add the message to the tail of the queue, thus changing the order of messages. Although this is not a problem for the leader election, it could be a problem when consolidating peer communication. This is to be verified, though.

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

        }


        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 {
                    LOG.error("Null listener when initializing cnx manager");
                }


                long sid = 1;
                cnxManager.toSend(sid, createMsg(ServerState.LOOKING.ordinal(), 0, -1, 1));


                Message m = null;
                int numRetries = 1;
                while((m == null) && (numRetries++ <= THRESHOLD)){
                    m = cnxManager.pollRecvQueue(3000, TimeUnit.MILLISECONDS);
                    if(m == null) cnxManager.connectAll();
                }


                if(numRetries > THRESHOLD){
                    failed = true;
                    return;
                }


                cnxManager.testInitiateConnection(sid);


                m = cnxManager.pollRecvQueue(3000, TimeUnit.MILLISECONDS);
                if(m == null){
                    failed = true;
                    return;
                }
            } catch (Exception e) {

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

    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;
        listener.start();




        cnxManager.toSend(1l, FLETestUtils.createMsg(ServerState.LOOKING.ordinal(), 0, 0, 0));

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

        
        /*
         * 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();


        ByteBuffer msg = FLETestUtils.createMsg(ServerState.FOLLOWING.ordinal(), 0, 0, 1);
        cnxManagers[0].toSend(0l, msg);
        
        /*
         * 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, msg);

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

    
    protected static final Logger LOG = LoggerFactory.getLogger(FLEPredicateTest.class);
    
    class MockFLE extends FastLeaderElection {
        MockFLE(QuorumPeer peer){
            super(peer, new QuorumCnxManager(peer));
        }

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

        CnxManagerThread thread = new CnxManagerThread();
        
        thread.start();
        
        QuorumPeer peer = new QuorumPeer(peers, tmpdir[1], tmpdir[1], port[1], 3, 1, 2, 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");
        }
            
        cnxManager.toSend(new Long(0), createMsg(ServerState.LOOKING.ordinal(), 1, -1, 1));
        
        Message m = null;
        int numRetries = 1;
        while((m == null) && (numRetries++ <= THRESHOLD)){
            m = cnxManager.recvQueue.poll(3000, TimeUnit.MILLISECONDS);
            if(m == null) cnxManager.connectAll();
        }
        
        assertTrue("Exceeded number of retries", numRetries <= THRESHOLD);


        thread.join(5000);

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

        }
        
        public void run(){
            try {
                QuorumPeer peer = new QuorumPeer(peers, tmpdir[0], tmpdir[0], port[0], 3, 0, 2, 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");
                }
                
                long sid = 1;
                cnxManager.toSend(sid, createMsg(ServerState.LOOKING.ordinal(), 0, -1, 1));
                
                Message m = null;
                int numRetries = 1;
                while((m == null) && (numRetries++ <= THRESHOLD)){
                    m = cnxManager.recvQueue.poll(3000, TimeUnit.MILLISECONDS);
                    if(m == null) cnxManager.connectAll();
                }
                
                if(numRetries > THRESHOLD){
                    failed = true;
                    return;
                }
                
                cnxManager.testInitiateConnection(sid);
            
                m = cnxManager.recvQueue.poll(3000, TimeUnit.MILLISECONDS);
                if(m == null){
                    failed = true;
                    return;

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

    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, 2, 2, 2);
        cnxManager = new QuorumCnxManager(peer);
        QuorumCnxManager.Listener listener = cnxManager.listener;
        if(listener != null){
            listener.start();
        } else {
            LOG.error("Null listener when initializing cnx manager");

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

        CnxManagerThread thread = new CnxManagerThread();
        
        thread.start();
        
        QuorumPeer peer = new QuorumPeer(peers, tmpdir[1], tmpdir[1], port[1], 3, 1, 2, 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");
        }
            
        cnxManager.toSend(new Long(0), createMsg(ServerState.LOOKING.ordinal(), 1, -1, 1));
        
        Message m = null;
        int numRetries = 1;
        while((m == null) && (numRetries++ <= THRESHOLD)){
            m = cnxManager.recvQueue.poll(3000, TimeUnit.MILLISECONDS);
            if(m == null) cnxManager.connectAll();
        }
        
        assertTrue("Exceeded number of retries", numRetries <= THRESHOLD);


        thread.join(5000);

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

        }
        
        public void run(){
            try {
                QuorumPeer peer = new QuorumPeer(peers, tmpdir[0], tmpdir[0], port[0], 3, 0, 2, 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");
                }
                
                long sid = 1;
                cnxManager.toSend(sid, createMsg(ServerState.LOOKING.ordinal(), 0, -1, 1));
                
                Message m = null;
                int numRetries = 1;
                while((m == null) && (numRetries++ <= THRESHOLD)){
                    m = cnxManager.recvQueue.poll(3000, TimeUnit.MILLISECONDS);
                    if(m == null) cnxManager.connectAll();
                }
                
                if(numRetries > THRESHOLD){
                    failed = true;
                    return;
                }
                
                cnxManager.testInitiateConnection(sid);
            
                m = cnxManager.recvQueue.poll(3000, TimeUnit.MILLISECONDS);
                if(m == null){
                    failed = true;
                    return;

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

        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 {
            LOG.error("Null listener when initializing cnx manager");
        }


        cnxManager.toSend(0L, createMsg(ServerState.LOOKING.ordinal(), 1, -1, 1));


        Message m = null;
        int numRetries = 1;
        while((m == null) && (numRetries++ <= THRESHOLD)){
            m = cnxManager.pollRecvQueue(3000, TimeUnit.MILLISECONDS);
            if(m == null) cnxManager.connectAll();
        }


        Assert.assertTrue("Exceeded number of retries", numRetries <= THRESHOLD);


        thread.join(5000);
        if (thread.isAlive()) {
            Assert.fail("Thread didn't join");
        } else {
            if(thread.failed)
                Assert.fail("Did not receive expected message");
        }
        cnxManager.halt();
        Assert.assertFalse(cnxManager.listener.isAlive());
    }

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