Example usage for org.apache.zookeeper KeeperException getMessage

List of usage examples for org.apache.zookeeper KeeperException getMessage

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Introduction

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

Prototype

@Override
    public String getMessage()

Source Link

Usage

From source file:org.apache.hadoop.hbase.client.ConnectionImplementation.java

License:Apache License

private void checkIfBaseNodeAvailable(ZooKeeperWatcher zkw) throws MasterNotRunningException {
    String errorMsg;//ww  w.ja v  a2s.c  om
    try {
        if (ZKUtil.checkExists(zkw, zkw.baseZNode) == -1) {
            errorMsg = "The node " + zkw.baseZNode + " is not in ZooKeeper. "
                    + "It should have been written by the master. "
                    + "Check the value configured in 'zookeeper.znode.parent'. "
                    + "There could be a mismatch with the one configured in the master.";
            LOG.error(errorMsg);
            throw new MasterNotRunningException(errorMsg);
        }
    } catch (KeeperException e) {
        errorMsg = "Can't get connection to ZooKeeper: " + e.getMessage();
        LOG.error(errorMsg);
        throw new MasterNotRunningException(errorMsg, e);
    }
}

From source file:org.apache.hadoop.hbase.master.zksyncer.ClientZKSyncer.java

License:Apache License

/**
 * Set data for client ZK and retry until succeed. Be very careful to prevent dead loop when
 * modifying this method/* www.  jav  a 2 s  . com*/
 * @param node the znode to set on client ZK
 * @param data the data to set to client ZK
 * @throws InterruptedException if the thread is interrupted during process
 */
private final void setDataForClientZkUntilSuccess(String node, byte[] data) throws InterruptedException {
    while (!server.isStopped()) {
        try {
            LOG.debug("Set data for remote " + node + ", client zk wather: " + clientZkWatcher);
            ZKUtil.setData(clientZkWatcher, node, data);
            break;
        } catch (KeeperException.NoNodeException nne) {
            // Node doesn't exist, create it and set value
            try {
                ZKUtil.createNodeIfNotExistsNoWatch(clientZkWatcher, node, data, CreateMode.PERSISTENT);
                break;
            } catch (KeeperException.ConnectionLossException | KeeperException.SessionExpiredException ee) {
                reconnectAfterExpiration();
            } catch (KeeperException e) {
                LOG.warn(
                        "Failed to create znode " + node + " due to: " + e.getMessage() + ", will retry later");
            }
        } catch (KeeperException.ConnectionLossException | KeeperException.SessionExpiredException ee) {
            reconnectAfterExpiration();
        } catch (KeeperException e) {
            LOG.debug("Failed to set data to client ZK, will retry later", e);
        }
        Threads.sleep(HConstants.SOCKET_RETRY_WAIT_MS);
    }
}

From source file:org.apache.hadoop.hbase.replication.ReplicationQueuesZKImpl.java

License:Apache License

/**
 * Try to set a lock in another region server's znode.
 * @param znode the server names of the other server
 * @return true if the lock was acquired, false in every other cases
 *///  w w w  .ja v a2 s.c o m
private boolean lockOtherRS(String znode) {
    try {
        String parent = ZKUtil.joinZNode(this.queuesZNode, znode);
        if (parent.equals(this.myQueuesZnode)) {
            LOG.warn("Won't lock because this is us, we're dead!");
            return false;
        }
        String p = ZKUtil.joinZNode(parent, RS_LOCK_ZNODE);
        ZKUtil.createAndWatch(this.zookeeper, p, lockToByteArray(this.myQueuesZnode));
    } catch (KeeperException e) {
        // This exception will pop up if the znode under which we're trying to
        // create the lock is already deleted by another region server, meaning
        // that the transfer already occurred.
        // NoNode => transfer is done and znodes are already deleted
        // NodeExists => lock znode already created by another RS
        if (e instanceof KeeperException.NoNodeException || e instanceof KeeperException.NodeExistsException) {
            LOG.info("Won't transfer the queue," + " another RS took care of it because of: " + e.getMessage());
        } else {
            LOG.info("Failed lock other rs", e);
        }
        return false;
    }
    return true;
}

From source file:org.apache.hadoop.hbase.replication.ReplicationZookeeper.java

License:Apache License

/**
 * Try to set a lock in another server's znode.
 * @param znode the server names of the other server
 * @return true if the lock was acquired, false in every other cases
 *//*ww  w. j a  v  a  2 s.  c o m*/
public boolean lockOtherRS(String znode) {
    try {
        String parent = ZKUtil.joinZNode(this.rsZNode, znode);
        if (parent.equals(rsServerNameZnode)) {
            LOG.warn("Won't lock because this is us, we're dead!");
            return false;
        }
        String p = ZKUtil.joinZNode(parent, RS_LOCK_ZNODE);
        ZKUtil.createAndWatch(this.zookeeper, p, Bytes.toBytes(rsServerNameZnode));
    } catch (KeeperException e) {
        // This exception will pop up if the znode under which we're trying to
        // create the lock is already deleted by another region server, meaning
        // that the transfer already occurred.
        // NoNode => transfer is done and znodes are already deleted
        // NodeExists => lock znode already created by another RS
        if (e instanceof KeeperException.NoNodeException || e instanceof KeeperException.NodeExistsException) {
            LOG.info("Won't transfer the queue," + " another RS took care of it because of: " + e.getMessage());
        } else {
            LOG.info("Failed lock other rs", e);
        }
        return false;
    }
    return true;
}

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

License:Apache License

public void start() {
    try {/*  w  w w . j av  a 2 s .  c om*/
        watcher.registerListener(this);
        String parent = ZKUtil.getParent(leaderZNode);
        if (ZKUtil.checkExists(watcher, parent) < 0) {
            ZKUtil.createWithParents(watcher, parent);
        }
    } catch (KeeperException ke) {
        watcher.abort("Unhandled zk exception when starting", ke);
        candidate.stop("Unhandled zk exception starting up: " + ke.getMessage());
    }
}

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

License:Apache License

private void handleLeaderChange() {
    try {// w w  w .j a va 2  s .co m
        synchronized (leaderExists) {
            if (ZKUtil.watchAndCheckExists(watcher, leaderZNode)) {
                LOG.info("Found new leader for znode: " + leaderZNode);
                leaderExists.set(true);
            } else {
                LOG.info("Leader change, but no new leader found");
                leaderExists.set(false);
                leaderExists.notifyAll();
            }
        }
    } catch (KeeperException ke) {
        watcher.abort("ZooKeeper error checking for leader znode", ke);
        candidate.stop("ZooKeeper error checking for leader: " + ke.getMessage());
    }
}

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

License:Apache License

/**
 * Blocks until this instance has claimed the leader ZNode in ZooKeeper
 *///from w w  w . j av a2 s .  c  om
public void waitToBecomeLeader() {
    while (!candidate.isStopped()) {
        try {
            if (ZKUtil.createEphemeralNodeAndWatch(watcher, leaderZNode, nodeId)) {
                // claimed the leader znode
                leaderExists.set(true);
                if (LOG.isDebugEnabled()) {
                    LOG.debug("Claimed the leader znode as '" + Bytes.toStringBinary(nodeId) + "'");
                }
                return;
            }

            // if claiming the node failed, there should be another existing node
            byte[] currentId = ZKUtil.getDataAndWatch(watcher, leaderZNode);
            if (currentId != null && Bytes.equals(currentId, nodeId)) {
                // claimed with our ID, but we didn't grab it, possibly restarted?
                LOG.info("Found existing leader with our ID (" + Bytes.toStringBinary(nodeId) + "), removing");
                ZKUtil.deleteNode(watcher, leaderZNode);
                leaderExists.set(false);
            } else {
                LOG.info("Found existing leader with ID: " + Bytes.toStringBinary(nodeId));
                leaderExists.set(true);
            }
        } catch (KeeperException ke) {
            watcher.abort("Unexpected error from ZK, stopping candidate", ke);
            candidate.stop("Unexpected error from ZK: " + ke.getMessage());
            return;
        }

        // wait for next chance
        synchronized (leaderExists) {
            while (leaderExists.get() && !candidate.isStopped()) {
                try {
                    leaderExists.wait();
                } catch (InterruptedException ie) {
                    LOG.debug("Interrupted waiting on leader", ie);
                }
            }
        }
    }
}

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

License:Apache License

/**
 * Removes the leader znode, if it is currently claimed by this instance.
 *///from ww w.ja  va 2 s  .  c  om
public void stepDownAsLeader() {
    try {
        synchronized (leaderExists) {
            if (!leaderExists.get()) {
                return;
            }
            byte[] leaderId = ZKUtil.getData(watcher, leaderZNode);
            if (leaderId != null && Bytes.equals(nodeId, leaderId)) {
                LOG.info("Stepping down as leader");
                ZKUtil.deleteNodeFailSilent(watcher, leaderZNode);
                leaderExists.set(false);
            } else {
                LOG.info("Not current leader, no need to step down");
            }
        }
    } catch (KeeperException ke) {
        watcher.abort("Unhandled zookeeper exception removing leader node", ke);
        candidate.stop("Unhandled zookeeper exception removing leader node: " + ke.getMessage());
    } catch (InterruptedException e) {
        watcher.abort("Unhandled zookeeper exception removing leader node", e);
        candidate.stop("Unhandled zookeeper exception removing leader node: " + e.getMessage());
    }
}

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

License:Apache License

/** @return String dump of everything in ZooKeeper. */
public static String dump(ZooKeeperWatcher zkw) {
    StringBuilder sb = new StringBuilder();
    try {/* ww w.  j a va  2 s .  c o  m*/
        sb.append("HBase is rooted at ").append(zkw.baseZNode);
        sb.append("\nActive master address: ");
        try {
            sb.append(MasterAddressTracker.getMasterAddress(zkw));
        } catch (IOException e) {
            sb.append("<<FAILED LOOKUP: " + e.getMessage() + ">>");
        }
        sb.append("\nBackup master addresses:");
        for (String child : listChildrenNoWatch(zkw, zkw.backupMasterAddressesZNode)) {
            sb.append("\n ").append(child);
        }
        sb.append("\nRegion server holding hbase:meta: " + new MetaTableLocator().getMetaRegionLocation(zkw));
        Configuration conf = HBaseConfiguration.create();
        int numMetaReplicas = conf.getInt(HConstants.META_REPLICAS_NUM, HConstants.DEFAULT_META_REPLICA_NUM);
        for (int i = 1; i < numMetaReplicas; i++) {
            sb.append("\nRegion server holding hbase:meta, replicaId " + i + " "
                    + new MetaTableLocator().getMetaRegionLocation(zkw, i));
        }
        sb.append("\nRegion servers:");
        for (String child : listChildrenNoWatch(zkw, zkw.rsZNode)) {
            sb.append("\n ").append(child);
        }
        try {
            getReplicationZnodesDump(zkw, sb);
        } catch (KeeperException ke) {
            LOG.warn("Couldn't get the replication znode dump", ke);
        }
        sb.append("\nQuorum Server Statistics:");
        String[] servers = zkw.getQuorum().split(",");
        for (String server : servers) {
            sb.append("\n ").append(server);
            try {
                String[] stat = getServerStats(server, ZKUtil.zkDumpConnectionTimeOut);

                if (stat == null) {
                    sb.append("[Error] invalid quorum server: " + server);
                    break;
                }

                for (String s : stat) {
                    sb.append("\n  ").append(s);
                }
            } catch (Exception e) {
                sb.append("\n  ERROR: ").append(e.getMessage());
            }
        }
    } catch (KeeperException ke) {
        sb.append("\nFATAL ZooKeeper Exception!\n");
        sb.append("\n" + ke.getMessage());
    }
    return sb.toString();
}

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

License:Apache License

public HServerInfo readAddress(String znode, Watcher watcher) {
    try {/*from w  ww.ja  v a 2 s.c  o m*/
        LOG.debug("<" + instanceName + ">" + "Trying to read " + znode);
        return readAddressOrThrow(znode, watcher);
    } catch (KeeperException e) {
        LOG.debug("<" + instanceName + ">" + "Failed to read " + e.getMessage());
        return null;
    }
}