/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.accumulo.server.client;
import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.List;
import java.util.UUID;
import org.apache.accumulo.core.Constants;
import org.apache.accumulo.core.client.AccumuloException;
import org.apache.accumulo.core.client.AccumuloSecurityException;
import org.apache.accumulo.core.client.Connector;
import org.apache.accumulo.core.client.Instance;
import org.apache.accumulo.core.client.ZooKeeperInstance;
import org.apache.accumulo.core.client.impl.ConnectorImpl;
import org.apache.accumulo.core.client.security.tokens.AuthenticationToken;
import org.apache.accumulo.core.client.security.tokens.PasswordToken;
import org.apache.accumulo.core.conf.AccumuloConfiguration;
import org.apache.accumulo.core.conf.Property;
import org.apache.accumulo.core.security.CredentialHelper;
import org.apache.accumulo.core.security.thrift.TCredentials;
import org.apache.accumulo.core.util.ByteBufferUtil;
import org.apache.accumulo.core.util.OpTimer;
import org.apache.accumulo.core.util.StringUtil;
import org.apache.accumulo.core.util.TextUtil;
import org.apache.accumulo.core.zookeeper.ZooUtil;
import org.apache.accumulo.fate.zookeeper.ZooCache;
import org.apache.accumulo.server.ServerConstants;
import org.apache.accumulo.server.conf.ServerConfiguration;
import org.apache.accumulo.server.zookeeper.ZooLock;
import org.apache.hadoop.io.Text;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
/**
* An implementation of Instance that looks in HDFS and ZooKeeper to find the master and root tablet location.
*
*/
public class HdfsZooInstance implements Instance {
public static class AccumuloNotInitializedException extends RuntimeException {
private static final long serialVersionUID = 1L;
public AccumuloNotInitializedException(String string) {
super(string);
}
}
private HdfsZooInstance() {
AccumuloConfiguration acuConf = ServerConfiguration.getSiteConfiguration();
zooCache = new ZooCache(acuConf.get(Property.INSTANCE_ZK_HOST), (int) acuConf.getTimeInMillis(Property.INSTANCE_ZK_TIMEOUT));
}
private static HdfsZooInstance cachedHdfsZooInstance = null;
public static synchronized Instance getInstance() {
if (cachedHdfsZooInstance == null)
cachedHdfsZooInstance = new HdfsZooInstance();
return cachedHdfsZooInstance;
}
private static ZooCache zooCache;
private static String instanceId = null;
private static final Logger log = Logger.getLogger(HdfsZooInstance.class);
@Override
public String getRootTabletLocation() {
String zRootLocPath = ZooUtil.getRoot(this) + Constants.ZROOT_TABLET_LOCATION;
OpTimer opTimer = new OpTimer(log, Level.TRACE).start("Looking up root tablet location in zoocache.");
byte[] loc = zooCache.get(zRootLocPath);
opTimer.stop("Found root tablet at " + (loc == null ? null : new String(loc, Constants.UTF8)) + " in %DURATION%");
if (loc == null) {
return null;
}
return new String(loc, Constants.UTF8).split("\\|")[0];
}
@Override
public List<String> getMasterLocations() {
String masterLocPath = ZooUtil.getRoot(this) + Constants.ZMASTER_LOCK;
OpTimer opTimer = new OpTimer(log, Level.TRACE).start("Looking up master location in zoocache.");
byte[] loc = ZooLock.getLockData(zooCache, masterLocPath, null);
opTimer.stop("Found master at " + (loc == null ? null : new String(loc, Constants.UTF8)) + " in %DURATION%");
if (loc == null) {
return Collections.emptyList();
}
return Collections.singletonList(new String(loc, Constants.UTF8));
}
@Override
public String getInstanceID() {
if (instanceId == null)
_getInstanceID();
return instanceId;
}
private static synchronized void _getInstanceID() {
if (instanceId == null) {
@SuppressWarnings("deprecation")
String instanceIdFromFile = ZooKeeperInstance.getInstanceIDFromHdfs(ServerConstants.getInstanceIdLocation());
instanceId = instanceIdFromFile;
}
}
@Override
public String getInstanceName() {
return ZooKeeperInstance.lookupInstanceName(zooCache, UUID.fromString(getInstanceID()));
}
@Override
public String getZooKeepers() {
return ServerConfiguration.getSiteConfiguration().get(Property.INSTANCE_ZK_HOST);
}
@Override
public int getZooKeepersSessionTimeOut() {
return (int) ServerConfiguration.getSiteConfiguration().getTimeInMillis(Property.INSTANCE_ZK_TIMEOUT);
}
@Override
// Not really deprecated, just not for client use
public Connector getConnector(String principal, AuthenticationToken token) throws AccumuloException, AccumuloSecurityException {
return getConnector(CredentialHelper.create(principal, token, getInstanceID()));
}
@SuppressWarnings("deprecation")
private Connector getConnector(TCredentials cred) throws AccumuloException, AccumuloSecurityException {
return new ConnectorImpl(this, cred);
}
@Deprecated
@Override
// Not really deprecated, just not for client use
public Connector getConnector(String user, byte[] pass) throws AccumuloException, AccumuloSecurityException {
return getConnector(user, new PasswordToken(pass));
}
@Deprecated
@Override
// Not really deprecated, just not for client use
public Connector getConnector(String user, ByteBuffer pass) throws AccumuloException, AccumuloSecurityException {
return getConnector(user, ByteBufferUtil.toBytes(pass));
}
@Deprecated
@Override
public Connector getConnector(String user, CharSequence pass) throws AccumuloException, AccumuloSecurityException {
return getConnector(user, TextUtil.getBytes(new Text(pass.toString())));
}
private AccumuloConfiguration conf = null;
@Override
public AccumuloConfiguration getConfiguration() {
if (conf == null)
conf = new ServerConfiguration(this).getConfiguration();
return conf;
}
@Override
public void setConfiguration(AccumuloConfiguration conf) {
this.conf = conf;
}
public static void main(String[] args) {
Instance instance = HdfsZooInstance.getInstance();
System.out.println("Instance Name: " + instance.getInstanceName());
System.out.println("Instance ID: " + instance.getInstanceID());
System.out.println("ZooKeepers: " + instance.getZooKeepers());
System.out.println("Masters: " + StringUtil.join(instance.getMasterLocations(), ", "));
}
@Deprecated
@Override
public Connector getConnector(org.apache.accumulo.core.security.thrift.AuthInfo auth) throws AccumuloException, AccumuloSecurityException {
return getConnector(auth.user, auth.getPassword());
}
}