Example usage for org.apache.zookeeper WatchedEvent getState

Introduction

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

Prototype

public KeeperState getState() 

Source Link

Usage

From source file:org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.java

License:Apache License

/**
 * This is the primary ZK watcher/*ww  w .j  a  v a 2 s .c  o m*/
 * @see org.apache.zookeeper.Watcher#process(org.apache.zookeeper.WatchedEvent)
 */
@Override
public synchronized void process(WatchedEvent event) {
    LOG.debug("<" + instanceName + "> Received ZK WatchedEvent: " + "[path=" + event.getPath() + "] "
            + "[state=" + event.getState().toString() + "] " + "[type=" + event.getType().toString() + "]");
    if (event.getType() == EventType.None) {
        if (event.getState() == KeeperState.Expired) {
            this.abort("ZooKeeper Session Expiration, aborting server",
                    new KeeperException.SessionExpiredException());
        } else if (event.getState() == KeeperState.Disconnected) {
            LOG.warn("Disconnected from ZooKeeper");
        } else if (event.getState() == KeeperState.SyncConnected) {
            LOG.info("Reconnected to ZooKeeper");
        }
        return;
    }
    for (Watcher w : listeners) {
        try {
            w.process(event);
        } catch (Throwable t) {
            LOG.error("<" + instanceName + ">" + " Sub-ZK Watcher threw an exception " + "in process()", t);
        }
    }
}

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From source file:org.apache.hadoop.hdfs.server.namenode.bookkeeper.zk.ConnectionWatcher.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    if (Event.KeeperState.SyncConnected.equals(event.getState())) {
        connectLatch.countDown();//from  w  w w .  j a  v  a 2 s .co m
        LOG.info("Connected to ZooKeeper");
    }
}

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From source file:org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.java

License:Apache License

@VisibleForTesting
@Private//  ww  w  .  j  a va  2s . com
@Unstable
public synchronized void processWatchEvent(WatchedEvent event) throws Exception {
    Event.EventType eventType = event.getType();
    LOG.info("Watcher event type: " + eventType + " with state:" + event.getState() + " for path:"
            + event.getPath() + " for " + this);

    if (eventType == Event.EventType.None) {

        // the connection state has changed
        switch (event.getState()) {
        case SyncConnected:
            LOG.info("ZKRMStateStore Session connected");
            if (oldZkClient != null) {
                // the SyncConnected must be from the client that sent Disconnected
                zkClient = oldZkClient;
                oldZkClient = null;
                ZKRMStateStore.this.notifyAll();
                LOG.info("ZKRMStateStore Session restored");
            }
            break;
        case Disconnected:
            LOG.info("ZKRMStateStore Session disconnected");
            oldZkClient = zkClient;
            zkClient = null;
            break;
        case Expired:
            // the connection got terminated because of session timeout
            // call listener to reconnect
            LOG.info("ZKRMStateStore Session expired");
            createConnection();
            break;
        default:
            LOG.error("Unexpected Zookeeper" + " watch event state: " + event.getState());
            break;
        }
    }
}

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From source file:org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.java

License:Apache License

@VisibleForTesting
@Private//  ww w  . ja va2 s .c om
@Unstable
public synchronized void processWatchEvent(ZooKeeper zk, WatchedEvent event) throws Exception {
    // only process watcher event from current ZooKeeper Client session.
    if (zk != activeZkClient) {
        LOG.info("Ignore watcher event type: " + event.getType() + " with state:" + event.getState()
                + " for path:" + event.getPath() + " from old session");
        return;
    }

    Event.EventType eventType = event.getType();
    LOG.info("Watcher event type: " + eventType + " with state:" + event.getState() + " for path:"
            + event.getPath() + " for " + this);

    if (eventType == Event.EventType.None) {

        // the connection state has changed
        switch (event.getState()) {
        case SyncConnected:
            LOG.info("ZKRMStateStore Session connected");
            if (zkClient == null) {
                // the SyncConnected must be from the client that sent Disconnected
                zkClient = activeZkClient;
                ZKRMStateStore.this.notifyAll();
                LOG.info("ZKRMStateStore Session restored");
            }
            break;
        case Disconnected:
            LOG.info("ZKRMStateStore Session disconnected");
            zkClient = null;
            break;
        case Expired:
            // the connection got terminated because of session timeout
            // call listener to reconnect
            LOG.info("ZKRMStateStore Session expired");
            createConnection();
            break;
        default:
            LOG.error("Unexpected Zookeeper" + " watch event state: " + event.getState());
            break;
        }
    }
}

---

From source file:org.apache.hedwig.server.netty.PubSubServer.java

License:Apache License

protected void instantiateZookeeperClient() throws Exception {
    if (!conf.isStandalone()) {
        final CountDownLatch signalZkReady = new CountDownLatch(1);

        zk = new ZooKeeper(conf.getZkHost(), conf.getZkTimeout(), new Watcher() {
            @Override//from  www .  j  a  v  a  2  s.  c  om
            public void process(WatchedEvent event) {
                if (Event.KeeperState.SyncConnected.equals(event.getState())) {
                    signalZkReady.countDown();
                }
            }
        });
        // wait until connection is effective
        if (!signalZkReady.await(conf.getZkTimeout() * 2, TimeUnit.MILLISECONDS)) {
            logger.error("Could not establish connection with ZooKeeper after zk_timeout*2 = "
                    + conf.getZkTimeout() * 2 + " ms. (Default value for zk_timeout is 2000).");
            throw new Exception("Could not establish connection with ZooKeeper after zk_timeout*2 = "
                    + conf.getZkTimeout() * 2 + " ms. (Default value for zk_timeout is 2000).");
        }
    }
}

---

From source file:org.apache.helix.manager.zk.zookeeper.ZkClient.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    LOG.debug("Received event: " + event);
    _zookeeperEventThread = Thread.currentThread();

    boolean stateChanged = event.getPath() == null;
    boolean znodeChanged = event.getPath() != null;
    boolean dataChanged = event.getType() == Event.EventType.NodeDataChanged
            || event.getType() == Event.EventType.NodeDeleted || event.getType() == Event.EventType.NodeCreated
            || event.getType() == Event.EventType.NodeChildrenChanged;

    getEventLock().lock();//www  .  ja v  a2 s  .  c o m
    try {

        // We might have to install child change event listener if a new node was created
        if (getShutdownTrigger()) {
            LOG.debug("ignoring event '{" + event.getType() + " | " + event.getPath()
                    + "}' since shutdown triggered");
            return;
        }
        if (stateChanged) {
            processStateChanged(event);
        }
        if (dataChanged) {
            processDataOrChildChange(event);
        }
    } finally {
        if (stateChanged) {
            getEventLock().getStateChangedCondition().signalAll();

            // If the session expired we have to signal all conditions, because watches might have been removed and
            // there is no guarantee that those
            // conditions will be signaled at all after an Expired event
            // TODO PVo write a test for this
            if (event.getState() == KeeperState.Expired) {
                getEventLock().getZNodeEventCondition().signalAll();
                getEventLock().getDataChangedCondition().signalAll();
                // We also have to notify all listeners that something might have changed
                fireAllEvents();
            }
        }
        if (znodeChanged) {
            getEventLock().getZNodeEventCondition().signalAll();
        }
        if (dataChanged) {
            getEventLock().getDataChangedCondition().signalAll();
        }
        getEventLock().unlock();

        // update state change counter.
        recordStateChange(stateChanged, dataChanged);

        LOG.debug("Leaving process event");
    }
}

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From source file:org.apache.helix.manager.zk.zookeeper.ZkClient.java

License:Apache License

private void processStateChanged(WatchedEvent event) {
    LOG.info("zookeeper state changed (" + event.getState() + ")");
    setCurrentState(event.getState());//from   w w  w  . j  a va  2  s .c  o  m
    if (getShutdownTrigger()) {
        return;
    }
    fireStateChangedEvent(event.getState());
    if (event.getState() == KeeperState.Expired) {
        try {
            reconnect();
            fireNewSessionEvents();
        } catch (final Exception e) {
            LOG.info("Unable to re-establish connection. Notifying consumer of the following exception: ", e);
            fireSessionEstablishmentError(e);
        }
    }
}

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From source file:org.apache.hms.controller.Controller.java

License:Apache License

public void process(WatchedEvent event) {
    if (event.getType() == Event.EventType.None) {
        // We are are being told that the state of the
        // connection has changed
        switch (event.getState()) {
        case SyncConnected:
            // In this particular example we don't need to do anything
            // here - watches are automatically re-registered with 
            // server and any watches triggered while the client was 
            // disconnected will be delivered (in order of course)
            break;
        case Expired:
            // It's all over
            running = false;/*from   ww  w  .j a v  a2s  .  c  o m*/
            commandHandler.stop();
            break;
        }
    }
}

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From source file:org.apache.niolex.zookeeper.core.ZKConnector.java

License:Apache License

/**
 * Override super method/*from   w w  w  .  j  av a 2 s . c om*/
 * @see org.apache.zookeeper.Watcher#process(org.apache.zookeeper.WatchedEvent)
 */
@Override
public void process(WatchedEvent event) {
    LOG.info("ZK Connection status changed to: {}.", event.getState());
    switch (event.getState()) {
    case SyncConnected:
        latch.countDown();
        break;
    case Expired:
        reconnect();
        break;
    }
}

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From source file:org.apache.solr.common.cloud.ConnectionManager.java

License:Apache License

@Override
public synchronized void process(WatchedEvent event) {
    if (log.isInfoEnabled()) {
        log.info("Watcher " + this + " name:" + name + " got event " + event + " path:" + event.getPath()
                + " type:" + event.getType());
    }//from   ww  w . ja  va  2  s. c  o  m

    if (isClosed) {
        log.info("Client->ZooKeeper status change trigger but we are already closed");
        return;
    }

    state = event.getState();
    if (state == KeeperState.SyncConnected) {
        connected = true;
        clientConnected.countDown();
        connectionStrategy.connected();
    } else if (state == KeeperState.Expired) {
        connected = false;
        log.info(
                "Our previous ZooKeeper session was expired. Attempting to reconnect to recover relationship with ZooKeeper...");

        try {
            connectionStrategy.reconnect(zkServerAddress, zkClientTimeout, this,
                    new ZkClientConnectionStrategy.ZkUpdate() {
                        @Override
                        public void update(SolrZooKeeper keeper) {
                            try {
                                waitForConnected(Long.MAX_VALUE);
                            } catch (Exception e1) {
                                closeKeeper(keeper);
                                throw new RuntimeException(e1);
                            }

                            log.info("Connection with ZooKeeper reestablished.");
                            try {
                                client.updateKeeper(keeper);
                            } catch (InterruptedException e) {
                                closeKeeper(keeper);
                                Thread.currentThread().interrupt();
                                // we must have been asked to stop
                                throw new RuntimeException(e);
                            } catch (Throwable t) {
                                closeKeeper(keeper);
                                throw new RuntimeException(t);
                            }

                            if (onReconnect != null) {
                                onReconnect.command();
                            }

                            synchronized (ConnectionManager.this) {
                                ConnectionManager.this.connected = true;
                            }

                        }
                    });
        } catch (Exception e) {
            SolrException.log(log, "", e);
        }
        log.info("Connected:" + connected);
    } else if (state == KeeperState.Disconnected) {
        log.info("zkClient has disconnected");
        connected = false;
        connectionStrategy.disconnected();
    } else {
        connected = false;
    }
    notifyAll();
}

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