Examples with Watcher org.apache.zookeeper.Watcher used on opensource projects

Example 6 with Watcher

use of org.apache.zookeeper.Watcher in project zookeeper by apache.

the class ReadOnlyModeTest method testConnectionEvents.

/**
     * Ensures that upon connection to a read-only server client receives
     * ConnectedReadOnly state notification.
     */
@Test(timeout = 90000)
public void testConnectionEvents() throws Exception {
    final List<KeeperState> states = new ArrayList<KeeperState>();
    ZooKeeper zk = new ZooKeeper(qu.getConnString(), CONNECTION_TIMEOUT, new Watcher() {

        public void process(WatchedEvent event) {
            states.add(event.getState());
        }
    }, true);
    boolean success = false;
    for (int i = 0; i < 30; i++) {
        try {
            zk.create("/test", "test".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
            success = true;
            break;
        } catch (KeeperException.ConnectionLossException e) {
            Thread.sleep(1000);
        }
    }
    Assert.assertTrue("Did not succeed in connecting in 30s", success);
    // kill peer and wait no more than 5 seconds for read-only server
    // to be started (which should take one tickTime (2 seconds))
    qu.shutdown(2);
    // Re-connect the client (in case we were connected to the shut down
    // server and the local session was not persisted).
    zk = new ZooKeeper(qu.getConnString(), CONNECTION_TIMEOUT, new Watcher() {

        public void process(WatchedEvent event) {
            states.add(event.getState());
        }
    }, true);
    long start = Time.currentElapsedTime();
    while (!(zk.getState() == States.CONNECTEDREADONLY)) {
        Thread.sleep(200);
        // FIXME this was originally 5 seconds, but realistically, on random/slow/virt hosts, there is no way to guarantee this
        Assert.assertTrue("Can't connect to the server", Time.currentElapsedTime() - start < 30000);
    }
    // At this point states list should contain, in the given order,
    // SyncConnected, Disconnected, and ConnectedReadOnly states
    Assert.assertTrue("ConnectedReadOnly event wasn't received", states.get(2) == KeeperState.ConnectedReadOnly);
    zk.close();
}

Example 7 with Watcher

use of org.apache.zookeeper.Watcher in project zookeeper by apache.

the class ReconfigTest method testPortChangeToBlockedPort.

private void testPortChangeToBlockedPort(boolean testLeader) throws Exception {
    // create 3 servers
    qu = new QuorumUtil(1);
    qu.disableJMXTest = true;
    qu.startAll();
    ZooKeeper[] zkArr = createHandles(qu);
    ZooKeeperAdmin[] zkAdminArr = createAdminHandles(qu);
    List<String> joiningServers = new ArrayList<String>();
    int leaderIndex = getLeaderId(qu);
    int followerIndex = leaderIndex == 1 ? 2 : 1;
    int serverIndex = testLeader ? leaderIndex : followerIndex;
    int reconfigIndex = testLeader ? followerIndex : leaderIndex;
    // modify server's client port
    int quorumPort = qu.getPeer(serverIndex).peer.getQuorumAddress().getPort();
    int electionPort = qu.getPeer(serverIndex).peer.getElectionAddress().getPort();
    int oldClientPort = qu.getPeer(serverIndex).peer.getClientPort();
    int newClientPort = PortAssignment.unique();
    try (ServerSocket ss = new ServerSocket()) {
        ss.bind(new InetSocketAddress(getLoopbackAddress(), newClientPort));
        joiningServers.add("server." + serverIndex + "=localhost:" + quorumPort + ":" + electionPort + ":participant;localhost:" + newClientPort);
        // create a /test znode and check that read/write works before
        // any reconfig is invoked
        testNormalOperation(zkArr[followerIndex], zkArr[leaderIndex]);
        // Reconfigure
        reconfig(zkAdminArr[reconfigIndex], joiningServers, null, null, -1);
        Thread.sleep(1000);
        // The follower reconfiguration will have failed
        zkArr[serverIndex].close();
        zkArr[serverIndex] = new ZooKeeper("127.0.0.1:" + newClientPort, ClientBase.CONNECTION_TIMEOUT, new Watcher() {

            public void process(WatchedEvent event) {
            }
        });
        zkAdminArr[serverIndex].close();
        zkAdminArr[serverIndex] = new ZooKeeperAdmin("127.0.0.1:" + newClientPort, ClientBase.CONNECTION_TIMEOUT, new Watcher() {

            public void process(WatchedEvent event) {
            }
        });
        try {
            Thread.sleep(1000);
            zkArr[serverIndex].setData("/test", "teststr".getBytes(), -1);
            Assert.fail("New client connected to new client port!");
        } catch (KeeperException.ConnectionLossException e) {
        // Exception is expected
        }
        try (ServerSocket ss2 = new ServerSocket()) {
            ss2.bind(new InetSocketAddress(getLoopbackAddress(), oldClientPort));
        }
        // Move back to the old port
        joiningServers.clear();
        joiningServers.add("server." + serverIndex + "=localhost:" + quorumPort + ":" + electionPort + ":participant;localhost:" + oldClientPort);
        reconfig(zkAdminArr[reconfigIndex], joiningServers, null, null, -1);
        zkArr[serverIndex].close();
        zkArr[serverIndex] = new ZooKeeper("127.0.0.1:" + oldClientPort, ClientBase.CONNECTION_TIMEOUT, new Watcher() {

            public void process(WatchedEvent event) {
            }
        });
        testNormalOperation(zkArr[followerIndex], zkArr[leaderIndex]);
        testServerHasConfig(zkArr[serverIndex], joiningServers, null);
        Assert.assertEquals(oldClientPort, qu.getPeer(serverIndex).peer.getClientPort());
    }
    closeAllHandles(zkArr, zkAdminArr);
}

Example 8 with Watcher

use of org.apache.zookeeper.Watcher in project zookeeper by apache.

the class ReconfigTest method testPortChange.

@Test
public void testPortChange() throws Exception {
    // create 3 servers
    qu = new QuorumUtil(1);
    qu.disableJMXTest = true;
    qu.startAll();
    ZooKeeper[] zkArr = createHandles(qu);
    ZooKeeperAdmin[] zkAdminArr = createAdminHandles(qu);
    List<String> joiningServers = new ArrayList<String>();
    int leaderIndex = getLeaderId(qu);
    int followerIndex = leaderIndex == 1 ? 2 : 1;
    // modify follower's client port
    int quorumPort = qu.getPeer(followerIndex).peer.getQuorumAddress().getPort();
    int electionPort = qu.getPeer(followerIndex).peer.getElectionAddress().getPort();
    int oldClientPort = qu.getPeer(followerIndex).peer.getClientPort();
    int newClientPort = PortAssignment.unique();
    joiningServers.add("server." + followerIndex + "=localhost:" + quorumPort + ":" + electionPort + ":participant;localhost:" + newClientPort);
    // create a /test znode and check that read/write works before
    // any reconfig is invoked
    testNormalOperation(zkArr[followerIndex], zkArr[leaderIndex]);
    reconfig(zkAdminArr[followerIndex], joiningServers, null, null, -1);
    try {
        for (int i = 0; i < 20; i++) {
            Thread.sleep(1000);
            zkArr[followerIndex].setData("/test", "teststr".getBytes(), -1);
        }
    } catch (KeeperException.ConnectionLossException e) {
        Assert.fail("Existing client disconnected when client port changed!");
    }
    zkArr[followerIndex].close();
    zkArr[followerIndex] = new ZooKeeper("127.0.0.1:" + oldClientPort, ClientBase.CONNECTION_TIMEOUT, new Watcher() {

        public void process(WatchedEvent event) {
        }
    });
    zkAdminArr[followerIndex].close();
    zkAdminArr[followerIndex] = new ZooKeeperAdmin("127.0.0.1:" + oldClientPort, ClientBase.CONNECTION_TIMEOUT, new Watcher() {

        public void process(WatchedEvent event) {
        }
    });
    zkAdminArr[followerIndex].addAuthInfo("digest", "super:test".getBytes());
    for (int i = 0; i < 10; i++) {
        try {
            Thread.sleep(1000);
            zkArr[followerIndex].setData("/test", "teststr".getBytes(), -1);
            Assert.fail("New client connected to old client port!");
        } catch (KeeperException.ConnectionLossException e) {
        }
    }
    zkArr[followerIndex].close();
    zkArr[followerIndex] = new ZooKeeper("127.0.0.1:" + newClientPort, ClientBase.CONNECTION_TIMEOUT, new Watcher() {

        public void process(WatchedEvent event) {
        }
    });
    zkAdminArr[followerIndex].close();
    zkAdminArr[followerIndex] = new ZooKeeperAdmin("127.0.0.1:" + newClientPort, ClientBase.CONNECTION_TIMEOUT, new Watcher() {

        public void process(WatchedEvent event) {
        }
    });
    zkAdminArr[followerIndex].addAuthInfo("digest", "super:test".getBytes());
    testNormalOperation(zkArr[followerIndex], zkArr[leaderIndex]);
    testServerHasConfig(zkArr[followerIndex], joiningServers, null);
    Assert.assertEquals(newClientPort, qu.getPeer(followerIndex).peer.getClientPort());
    joiningServers.clear();
    // change leader's leading port - should renounce leadership
    int newQuorumPort = PortAssignment.unique();
    joiningServers.add("server." + leaderIndex + "=localhost:" + newQuorumPort + ":" + qu.getPeer(leaderIndex).peer.getElectionAddress().getPort() + ":participant;localhost:" + qu.getPeer(leaderIndex).peer.getClientPort());
    reconfig(zkAdminArr[leaderIndex], joiningServers, null, null, -1);
    testNormalOperation(zkArr[followerIndex], zkArr[leaderIndex]);
    Assert.assertTrue(qu.getPeer(leaderIndex).peer.getQuorumAddress().getPort() == newQuorumPort);
    // the leader changed
    Assert.assertTrue(getLeaderId(qu) != leaderIndex);
    joiningServers.clear();
    for (int i = 1; i <= 3; i++) {
        joiningServers.add("server." + i + "=localhost:" + qu.getPeer(i).peer.getQuorumAddress().getPort() + ":" + PortAssignment.unique() + ":participant;localhost:" + qu.getPeer(i).peer.getClientPort());
    }
    reconfig(zkAdminArr[1], joiningServers, null, null, -1);
    leaderIndex = getLeaderId(qu);
    int follower1 = leaderIndex == 1 ? 2 : 1;
    int follower2 = 1;
    while (follower2 == leaderIndex || follower2 == follower1) follower2++;
    // lets kill the leader and see if a new one is elected
    qu.shutdown(getLeaderId(qu));
    testNormalOperation(zkArr[follower2], zkArr[follower1]);
    testServerHasConfig(zkArr[follower1], joiningServers, null);
    testServerHasConfig(zkArr[follower2], joiningServers, null);
    closeAllHandles(zkArr, zkAdminArr);
}

Example 9 with Watcher

use of org.apache.zookeeper.Watcher in project zookeeper by apache.

the class ReconfigTest method createHandles.

public static ZooKeeper[] createHandles(QuorumUtil qu) throws IOException {
    // create an extra handle, so we can index the handles from 1 to qu.ALL
    // using the server id.
    ZooKeeper[] zkArr = new ZooKeeper[qu.ALL + 1];
    // not used.
    zkArr[0] = null;
    for (int i = 1; i <= qu.ALL; i++) {
        // server ids are 1, 2 and 3
        zkArr[i] = new ZooKeeper("127.0.0.1:" + qu.getPeer(i).peer.getClientPort(), ClientBase.CONNECTION_TIMEOUT, new Watcher() {

            public void process(WatchedEvent event) {
            }
        });
    }
    return zkArr;
}

Example 10 with Watcher

use of org.apache.zookeeper.Watcher in project zookeeper by apache.

the class QuorumTest method testLeaderShutdown.

@Test
public void testLeaderShutdown() throws IOException, InterruptedException, KeeperException {
    ZooKeeper zk = new DisconnectableZooKeeper(qb.hostPort, ClientBase.CONNECTION_TIMEOUT, new Watcher() {

        public void process(WatchedEvent event) {
        }
    });
    zk.create("/blah", new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    zk.create("/blah/blah", new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    Leader leader = qb.s1.leader;
    if (leader == null)
        leader = qb.s2.leader;
    if (leader == null)
        leader = qb.s3.leader;
    if (leader == null)
        leader = qb.s4.leader;
    if (leader == null)
        leader = qb.s5.leader;
    Assert.assertNotNull(leader);
    for (int i = 0; i < 5000; i++) {
        zk.setData("/blah/blah", new byte[0], -1, new AsyncCallback.StatCallback() {

            public void processResult(int rc, String path, Object ctx, Stat stat) {
                counter++;
                if (rc != 0) {
                    errors++;
                }
            }
        }, null);
    }
    for (LearnerHandler f : leader.getForwardingFollowers()) {
        f.getSocket().shutdownInput();
    }
    for (int i = 0; i < 5000; i++) {
        zk.setData("/blah/blah", new byte[0], -1, new AsyncCallback.StatCallback() {

            public void processResult(int rc, String path, Object ctx, Stat stat) {
                counter++;
                if (rc != 0) {
                    errors++;
                }
            }
        }, null);
    }
    // check if all the followers are alive
    Assert.assertTrue(qb.s1.isAlive());
    Assert.assertTrue(qb.s2.isAlive());
    Assert.assertTrue(qb.s3.isAlive());
    Assert.assertTrue(qb.s4.isAlive());
    Assert.assertTrue(qb.s5.isAlive());
    zk.close();
}