Example usage for org.apache.zookeeper WatchedEvent getType

Introduction

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

Prototype

public EventType getType() 

Source Link

Usage

From source file:org.apache.hadoop.hbase.master.ZKMasterAddressWatcher.java

License:Apache License

/**
 * @see org.apache.zookeeper.Watcher#process(org.apache.zookeeper.WatchedEvent)
 *///w w  w  .j a  va2s. c  o  m
@Override
public synchronized void process(WatchedEvent event) {
    EventType type = event.getType();
    if (type.equals(EventType.NodeDeleted)) {
        if (event.getPath().equals(this.zookeeper.clusterStateZNode)) {
            LOG.info("Cluster shutdown while waiting, shutting down" + " this master.");
            this.stoppable.requestClusterShutdown();
        } else if (event.getPath().equals(this.zookeeper.masterElectionZNode)) {
            LOG.info("Master address ZNode deleted, notifying waiting masters");
            notifyAll();
        }
    } else if (type.equals(EventType.NodeCreated)) {
        if (event.getPath().equals(this.zookeeper.clusterStateZNode)) {
            LOG.info("Resetting watch on cluster state node.");
            this.zookeeper.setClusterStateWatch();
        } else if (event.getPath().equals(this.zookeeper.masterElectionZNode)) {
            LOG.info("Master address ZNode created, check exists and reset watch");
            if (!zookeeper.exists(zookeeper.masterElectionZNode, true)) {
                LOG.debug("Got NodeCreated for master node but it does not exist now" + ", notifying");
                notifyAll();
            }
        }
    }
}

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From source file:org.apache.hadoop.hbase.master.ZKUnassignedWatcher.java

License:Apache License

/**
 * This is the processing loop that gets triggered from the ZooKeeperWrapper.
 * This zookeeper events process function dies the following:
 *   - WATCHES the following events: NodeCreated, NodeDataChanged, NodeChildrenChanged
 *   - IGNORES the following events: None, NodeDeleted
 *///from   ww w.j a va 2  s. c o  m
@Override
public synchronized void process(WatchedEvent event) {
    EventType eventType = event.getType();
    // Handle the ignored events
    if (eventType.equals(EventType.None) || eventType.equals(EventType.NodeDeleted)) {
        return;
    }

    // check if the path is for the UNASSIGNED directory we care about
    if (event.getPath() == null || !event.getPath().startsWith(unassignedZNode)) {
        return;
    }

    LOG.debug("ZK-EVENT-PROCESS: Got zkEvent " + eventType + " path:" + event.getPath());

    try {
        /*
         * If a node is created in the UNASSIGNED directory in zookeeper, then:
         *   1. watch its updates (this is an unassigned region).
         *   2. read to see what its state is and handle as needed (state may have
         *      changed before we started watching it)
         */
        if (eventType.equals(EventType.NodeCreated)) {
            zkWrapper.watchZNode(event.getPath());
            handleRegionStateInZK(eventType, event.getPath());
        }
        /*
         * Data on some node has changed. Read to see what the state is and handle
         * as needed.
         */
        else if (eventType.equals(EventType.NodeDataChanged)) {
            handleRegionStateInZK(eventType, event.getPath());
        }
        /*
         * If there were some nodes created then watch those nodes
         */
        else if (eventType.equals(EventType.NodeChildrenChanged)) {
            List<ZNodeEventData> newZNodes = zkWrapper.watchAndGetNewChildren(event.getPath());
            for (ZNodeEventData zNodePathAndData : newZNodes) {
                LOG.debug("Handling updates for znode: " + zNodePathAndData.getzNodePath());
                handleRegionStateInZK(eventType, zNodePathAndData.getzNodePath(), zNodePathAndData.getData(),
                        true);
            }
        }
    } catch (IOException e) {
        LOG.error("Could not process event from ZooKeeper", e);
    }
}

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From source file:org.apache.hadoop.hbase.stargate.RESTServlet.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    LOG.debug(("ZooKeeper.Watcher event " + event.getType() + " with path " + event.getPath()));
    // handle disconnection (or manual delete to test disconnection scenario)
    if (event.getState() == KeeperState.Expired
            || (event.getType().equals(EventType.NodeDeleted) && event.getPath().equals(znode))) {
        wrapper.close();//w ww .java  2 s  .  co  m
        wrapper = null;
        while (!stopping.get())
            try {
                wrapper = initZooKeeperWrapper();
                break;
            } catch (IOException e) {
                LOG.error(StringUtils.stringifyException(e));
                try {
                    Thread.sleep(10 * 1000);
                } catch (InterruptedException ex) {
                }
            }
    }
}

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From source file:org.apache.hadoop.hbase.zookeeper.lock.DeletionWatcher.java

License:Apache License

@Override
public void process(WatchedEvent watchedEvent) {
    if (watchedEvent.getPath().equals(pathToWatch)) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("Processing event " + watchedEvent + " on " + pathToWatch);
        }//w w w  .  j a v a 2 s  .  co m
        try {
            if (watchedEvent.getType() == EventType.NodeDeleted
                    || !(zooKeeperWrapper.setWatchIfNodeExists(pathToWatch))) {
                deletedLatch.countDown();
            }
        } catch (Throwable t) {
            exception = t;
            deletedLatch.countDown();
            LOG.error("Error when re-setting the watch on " + pathToWatch, t);
        }
    }
}

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

License:Apache License

/**
 * Method called from ZooKeeper for events and connection status.
 * <p>/*from  w w  w.  j a v a  2s .  c o m*/
 * Valid events are passed along to listeners.  Connection status changes
 * are dealt with locally.
 */
@Override
public void process(WatchedEvent event) {
    LOG.debug(prefix("Received ZooKeeper Event, " + "type=" + event.getType() + ", " + "state="
            + event.getState() + ", " + "path=" + event.getPath()));

    switch (event.getType()) {

    // If event type is NONE, this is a connection status change
    case None: {
        connectionEvent(event);
        break;
    }

    // Otherwise pass along to the listeners

    case NodeCreated: {
        for (ZKListener listener : listeners) {
            listener.nodeCreated(event.getPath());
        }
        break;
    }

    case NodeDeleted: {
        for (ZKListener listener : listeners) {
            listener.nodeDeleted(event.getPath());
        }
        break;
    }

    case NodeDataChanged: {
        for (ZKListener listener : listeners) {
            listener.nodeDataChanged(event.getPath());
        }
        break;
    }

    case NodeChildrenChanged: {
        for (ZKListener listener : listeners) {
            listener.nodeChildrenChanged(event.getPath());
        }
        break;
    }
    default:
        throw new IllegalStateException("Received event is not valid: " + event.getState());
    }
}

---

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

License:Apache License

/**
 * This is the primary ZK watcher/*w w w  .ja va 2 s. c om*/
 * @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.hive.common.ZKDeRegisterWatcher.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    if (event.getType().equals(Watcher.Event.EventType.NodeDeleted)) {
        zooKeeperHiveHelper.deregisterZnode();
    }//from  w  w  w. j a v a  2  s .  c  o m
}

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From source file:org.apache.hadoop.hive.llap.registry.impl.SlotZnode.java

License:Apache License

private void processWatchedEvent(WatchedEvent event) {
    if (event.getType() != EventType.NodeDeleted)
        return;/*ww w . j av  a 2  s.c om*/
    String localPath = nodePath.get();
    if (localPath == null)
        return;
    if (!localPath.equals(event.getPath())) {
        LOG.info("Ignoring the NodeDeleted event for " + event.getPath());
        return;
    }
    LOG.info("Trying to reacquire because of the NodeDeleted event");
    startCreateCurrentNode();
}

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

License:Apache License

@VisibleForTesting
@Private/*from   w  ww .  ja v a 2 s . c  om*/
@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;
        }
    }
}

---

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

License:Apache License

@VisibleForTesting
@Private/*from  www  .  j a v a2s.com*/
@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;
        }
    }
}

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