Example usage for org.apache.zookeeper ZooKeeper ZooKeeper

List of usage examples for org.apache.zookeeper ZooKeeper ZooKeeper

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Introduction

In this page you can find the example usage for org.apache.zookeeper ZooKeeper ZooKeeper.

Prototype

public ZooKeeper(String connectString, int sessionTimeout, Watcher watcher) throws IOException

Source Link

Document

To create a ZooKeeper client object, the application needs to pass a connection string containing a comma separated list of host:port pairs, each corresponding to a ZooKeeper server.

Usage

From source file:ZooKeeperSetAcls.java

License:Apache License

public ZooKeeperSetAcls(String args[]) {
    if (!cl.parseOptions(args)) {
        System.exit(1);/*ww  w.  jav  a2  s  . c o m*/
    }

    Watcher watcher = new MyWatcher();
    System.out.println("Connecting to " + cl.getOption("server"));
    try {
        zk = new ZooKeeper(cl.getOption("server"), Integer.parseInt(cl.getOption("timeout")), watcher);
    } catch (IOException e) {
        System.err.println("IOError: " + e.getMessage());
        System.exit(2);
    }

    for (MyPathWithACLs pwa : cl.getPathsWithACLs()) {
        try {
            zk.setACL(pwa.getPath(), pwa.getACLs(), -1);
        } catch (NoNodeException e) {
            // if node doesn't exist yet, try to create it with the given
            // ACL
            try {
                zk.create(pwa.getPath(), new byte[0], pwa.getACLs(), CreateMode.PERSISTENT);
            } catch (InterruptedException f) {
                System.err.println("create interrupted: " + f.getMessage());
                System.exit(5);
            } catch (KeeperException f) {
                System.err.println("create operation error: " + f.getMessage());
                System.exit(6);
            }
        } catch (InterruptedException e) {
            System.err.println("setACL interrupted: " + e.getMessage());
            System.exit(3);
        } catch (KeeperException e) {
            System.err.println("setACL operation error: " + e.getMessage());
            System.exit(4);
        }
    }
}

From source file:accismus.benchmark.BenchTestIT.java

License:Apache License

@BeforeClass
public static void setUp() throws Exception {
    String instanceName = "plugin-it-instance";
    instance = new MiniAccumuloInstance(instanceName, new File("target/accumulo-maven-plugin/" + instanceName));
    zk = new ZooKeeper(instance.getZooKeepers(), 30000, null);
}

From source file:akka.cluster.LocalBookKeeper.java

License:Open Source License

public void initializeZookeper() {
    //initialize the zk client with values
    try {//from  ww  w.  j a  v a 2  s.c  om
        zkc = new ZooKeeper("127.0.0.1", ZooKeeperDefaultPort, new emptyWatcher());
        zkc.create("/ledgers", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        zkc.create("/ledgers/available", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        // No need to create an entry for each requested bookie anymore as the
        // BookieServers will register themselves with ZooKeeper on startup.
    } catch (KeeperException e) {
    } catch (InterruptedException e) {
    } catch (IOException e) {
    }
}

From source file:at.salzburgresearch.kmt.zkconfig.ZookeeperConfiguration.java

License:Apache License

private void zkInit() throws IOException {
    sync.raiseBarrier();/*from w  w w  .ja va2 s .co m*/
    final CountDownLatch connected = new CountDownLatch(1);
    log.debug("zkInit - connecting");
    // if (zk != null) zk.close();
    zk = new ZooKeeper(zkConnectionString, zkTimeout, new ZKWatcher(connected, sync));

    log.info("zkInit - ensure root node exists");
    try {
        if (connected.await(zkTimeout, TimeUnit.MILLISECONDS)) {
            for (int i = zkRoot.indexOf('/', 1); i > 0; i = zkRoot.indexOf('/', i + 1)) {
                final String path = zkRoot.substring(0, i);
                log.trace("zkInit - checking existence of {}", path);
                if (zk.exists(path, false) == null) {
                    zk.create(path, new byte[] {}, ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
                }
            }
            log.debug("zkInit - zkRoot {} exists", zkRoot);
        } else {
            throw new IOException("Timeout while establishing ZooKeeper connection");
        }
    } catch (InterruptedException e) {
        throw new IOException("Could not connect", e);
    } catch (KeeperException e) {
        throw new IOException("Initial Connection failed - is zookeeper available?", e);
    }
    log.info("zkInit - connected");
    sync.lowerBarrier();
}

From source file:blazingcache.zookeeper.ZKCacheServerLocator.java

License:Apache License

@Override
protected ServerHostData getServer() {

    String leaderPath = basePath + "/leader";
    try {//from w w  w . ja  va  2s .  c  om
        byte[] data;
        if (ownedZk) {
            CountDownLatch connection = new CountDownLatch(1);
            try {
                LOGGER.finest("creating temp ZK client for discovery");
                ZooKeeper client = new ZooKeeper(zkAddress, zkSessiontimeout, new Watcher() {

                    @Override
                    public void process(WatchedEvent event) {
                        if (event.getState() == Event.KeeperState.SyncConnected
                                || event.getState() == Event.KeeperState.ConnectedReadOnly) {
                            connection.countDown();
                        }
                        LOGGER.severe("process ZK event " + event.getState() + " " + event.getType() + " "
                                + event.getPath());
                    }
                });
                try {
                    connection.await(connectTimeout, TimeUnit.MILLISECONDS);
                    LOGGER.finest("ZK client is " + client);
                    // se la connessione non sar stabilita in tempo o c' qualche problem troveremo un ConnectionLoss ad esempio                                        
                    data = client.getData(leaderPath, false, null);
                } finally {
                    client.close();
                }
            } catch (IOException err) {
                LOGGER.log(Level.SEVERE, "zookeeper client not available: " + err);
                return null;
            }

        } else {
            ZooKeeper client = zkSupplier.get();
            if (client == null) {
                LOGGER.log(Level.SEVERE, "zookeeper client available");
                return null;
            }
            data = client.getData(leaderPath, false, null);
        }
        lastKnownServer = ServerHostData.parseHostdata(data);
        return lastKnownServer;
    } catch (KeeperException.NoNodeException nobroker) {
        LOGGER.log(Level.SEVERE, "zookeeper client error", nobroker);
        return null;
    } catch (KeeperException | InterruptedException err) {
        LOGGER.log(Level.SEVERE, "zookeeper client error", err);
        return null;
    }
}

From source file:blazingcache.zookeeper.ZKClusterManager.java

License:Apache License

/**
 * Creates a new ZooKeeper-based cluster manager.
 *
 * @param zkAddress/*from   www .ja  va 2 s.  co  m*/
 * @param zkTimeout     
 * @param basePath
 * @param listener
 * @param localhostdata
 * @throws Exception
 */
public ZKClusterManager(String zkAddress, int zkTimeout, String basePath, LeaderShipChangeListener listener,
        byte[] localhostdata) throws Exception {
    this.zk = new ZooKeeper(zkAddress, zkTimeout, new SystemWatcher());
    this.zkAddress = zkAddress;
    this.zkTimeout = zkTimeout;
    this.basePath = basePath;
    this.listener = listener;
    this.localhostdata = localhostdata;
    this.leaderpath = basePath + "/leader";
    this.discoverypath = basePath + "/discoverypath";
    this.connectionTimeout = zkTimeout;
}

From source file:blazingcache.zookeeper.ZKClusterManager.java

License:Apache License

/**
*
* Actually creates the ZooKeeper session.
*
* @throws IOException in case of network issues to connect to ZooKeeper
* service//from   w  w w .  j  a  va  2 s  .c o m
*/
public final void restartZK() throws IOException {
    LOGGER.log(Level.SEVERE, "Restarting ZooKeeper client after session expired");
    this.zk = new ZooKeeper(this.zkAddress, this.zkTimeout, new SystemWatcher());
}

From source file:camelagent.util.ZookeeperContainerNamingStrategy.java

License:Open Source License

/**
 * @param path/*w  ww .j  av a 2 s.  c  o m*/
 * @param createMode
 * @throws IOException
 * @throws KeeperException
 * @throws InterruptedException
 * Connects to the Zookeepr server and create a node using the given path
 */
public ZookeeperContainerNamingStrategy(String path, CreateMode createMode)
        throws IOException, KeeperException, InterruptedException {
    prop = new Properties();
    try {
        prop.load(new FileInputStream("config.properties"));
    } catch (Exception e) {

    }
    HOST = prop.getProperty("zookeeper_server");
    zk = new ZooKeeper(HOST, 3000, new ZooKeeperWatcher());

    if (zk.exists(path, false) == null)
        containerId = zk.create(path, NO_DATA, Ids.OPEN_ACL_UNSAFE, createMode);
}

From source file:cc.alessandro.zookeeper.example.SyncPrimitive.java

License:Open Source License

public SyncPrimitive(final String address, final String root) throws IOException {

    if (zk == null) {
        LOG.debug("Starting ZooKeeper ...");
        zk = new ZooKeeper(Preconditions.checkNotNull(address), 3000, this);
        mutex = new Integer(-1);
        LOG.debug("Finished starting ZooKeeper: {}", zk);
    } else {/*from w ww  . j a va 2s . c o  m*/
        mutex = new Integer(-1);
    }

    Preconditions.checkArgument(!Strings.isNullOrEmpty(root));
    this.root = root;
}

From source file:ch.usi.da.dlog.Client.java

License:Open Source License

/**
 * @param args//www .j  a  va2  s .c  om
 */
public static void main(String[] args) {
    String zoo_host = "127.0.0.1:2181";
    if (args.length > 1) {
        zoo_host = args[1];
    }
    if (args.length < 1) {
        System.err.println("Plese use \"Client\" \"ring ID,node ID;global ring ID,node ID\"");
    } else {
        final Map<Integer, Integer> connectMap = parseConnectMap(args[0]);
        try {
            final Client client = new Client(new ZooKeeper(zoo_host, 3000, new DummyWatcher()), connectMap);
            Runtime.getRuntime().addShutdownHook(new Thread("ShutdownHook") {
                @Override
                public void run() {
                    client.stop();
                }
            });
            client.init();
            client.readStdin();
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        }
    }
}