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Server functionality for HBase
/**
*
* 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.hadoop.hbase.master;
import java.io.Closeable;
import java.io.IOException;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.NetworkInterface;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.ClusterMetrics;
import org.apache.hadoop.hbase.ClusterMetricsBuilder;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.ScheduledChore;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.util.Addressing;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.util.ExceptionUtil;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.hbase.util.ReflectionUtils;
import org.apache.hadoop.hbase.util.Threads;
import org.apache.hadoop.hbase.util.VersionInfo;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.hbase.thirdparty.io.netty.bootstrap.Bootstrap;
import org.apache.hbase.thirdparty.io.netty.bootstrap.ChannelFactory;
import org.apache.hbase.thirdparty.io.netty.buffer.Unpooled;
import org.apache.hbase.thirdparty.io.netty.channel.Channel;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelException;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelOption;
import org.apache.hbase.thirdparty.io.netty.channel.EventLoopGroup;
import org.apache.hbase.thirdparty.io.netty.channel.nio.NioEventLoopGroup;
import org.apache.hbase.thirdparty.io.netty.channel.socket.DatagramChannel;
import org.apache.hbase.thirdparty.io.netty.channel.socket.DatagramPacket;
import org.apache.hbase.thirdparty.io.netty.channel.socket.InternetProtocolFamily;
import org.apache.hbase.thirdparty.io.netty.channel.socket.nio.NioDatagramChannel;
import org.apache.hbase.thirdparty.io.netty.handler.codec.MessageToMessageEncoder;
import org.apache.hbase.thirdparty.io.netty.util.internal.StringUtil;
/**
* Class to publish the cluster status to the client. This allows them to know immediately
* the dead region servers, hence to cut the connection they have with them, eventually stop
* waiting on the socket. This improves the mean time to recover, and as well allows to increase
* on the client the different timeouts, as the dead servers will be detected separately.
*/
@InterfaceAudience.Private
public class ClusterStatusPublisher extends ScheduledChore {
/**
* The implementation class used to publish the status. Default is null (no publish).
* Use org.apache.hadoop.hbase.master.ClusterStatusPublisher.MulticastPublisher to multicast the
* status.
*/
public static final String STATUS_PUBLISHER_CLASS = "hbase.status.publisher.class";
public static final Class
DEFAULT_STATUS_PUBLISHER_CLASS =
org.apache.hadoop.hbase.master.ClusterStatusPublisher.MulticastPublisher.class;
/**
* The minimum time between two status messages, in milliseconds.
*/
public static final String STATUS_PUBLISH_PERIOD = "hbase.status.publish.period";
public static final int DEFAULT_STATUS_PUBLISH_PERIOD = 10000;
private long lastMessageTime = 0;
private final HMaster master;
private final int messagePeriod; // time between two message
private final ConcurrentMap lastSent = new ConcurrentHashMap<>();
private Publisher publisher;
private boolean connected = false;
/**
* We want to limit the size of the protobuf message sent, do fit into a single packet.
* a reasonable size for ip / ethernet is less than 1Kb.
*/
public final static int MAX_SERVER_PER_MESSAGE = 10;
/**
* If a server dies, we're sending the information multiple times in case a receiver misses the
* message.
*/
public final static int NB_SEND = 5;
public ClusterStatusPublisher(HMaster master, Configuration conf,
Class publisherClass)
throws IOException {
super("HBase clusterStatusPublisher for " + master.getName(), master, conf.getInt(
STATUS_PUBLISH_PERIOD, DEFAULT_STATUS_PUBLISH_PERIOD));
this.master = master;
this.messagePeriod = conf.getInt(STATUS_PUBLISH_PERIOD, DEFAULT_STATUS_PUBLISH_PERIOD);
try {
this.publisher = publisherClass.getDeclaredConstructor().newInstance();
} catch (Exception e) {
throw new IOException("Can't create publisher " + publisherClass.getName(), e);
}
this.publisher.connect(conf);
connected = true;
}
// For tests only
protected ClusterStatusPublisher() {
master = null;
messagePeriod = 0;
}
@Override
protected void chore() {
if (!isConnected()) {
return;
}
List sns = generateDeadServersListToSend();
if (sns.isEmpty()) {
// Nothing to send. Done.
return;
}
final long curTime = EnvironmentEdgeManager.currentTime();
if (lastMessageTime > curTime - messagePeriod) {
// We already sent something less than 10 second ago. Done.
return;
}
// Ok, we're going to send something then.
lastMessageTime = curTime;
// We're reusing an existing protobuf message, but we don't send everything.
// This could be extended in the future, for example if we want to send stuff like the
// hbase:meta server name.
publisher.publish(ClusterMetricsBuilder.newBuilder()
.setHBaseVersion(VersionInfo.getVersion())
.setClusterId(master.getMasterFileSystem().getClusterId().toString())
.setMasterName(master.getServerName())
.setDeadServerNames(sns)
.build());
}
@Override
protected synchronized void cleanup() {
connected = false;
publisher.close();
}
private synchronized boolean isConnected() {
return this.connected;
}
/**
* Create the dead server to send. A dead server is sent NB_SEND times. We send at max
* MAX_SERVER_PER_MESSAGE at a time. if there are too many dead servers, we send the newly
* dead first.
*/
protected List generateDeadServersListToSend() {
// We're getting the message sent since last time, and add them to the list
long since = EnvironmentEdgeManager.currentTime() - messagePeriod * 2;
for (Pair dead : getDeadServers(since)) {
lastSent.putIfAbsent(dead.getFirst(), 0);
}
// We're sending the new deads first.
List> entries = new ArrayList<>();
entries.addAll(lastSent.entrySet());
Collections.sort(entries, new Comparator>() {
@Override
public int compare(Map.Entry o1, Map.Entry o2) {
return o1.getValue().compareTo(o2.getValue());
}
});
// With a limit of MAX_SERVER_PER_MESSAGE
int max = entries.size() > MAX_SERVER_PER_MESSAGE ? MAX_SERVER_PER_MESSAGE : entries.size();
List res = new ArrayList<>(max);
for (int i = 0; i < max; i++) {
Map.Entry toSend = entries.get(i);
if (toSend.getValue() >= (NB_SEND - 1)) {
lastSent.remove(toSend.getKey());
} else {
lastSent.replace(toSend.getKey(), toSend.getValue(), toSend.getValue() + 1);
}
res.add(toSend.getKey());
}
return res;
}
/**
* Get the servers which died since a given timestamp.
* protected because it can be subclassed by the tests.
*/
protected List> getDeadServers(long since) {
if (master.getServerManager() == null) {
return Collections.emptyList();
}
return master.getServerManager().getDeadServers().copyDeadServersSince(since);
}
public interface Publisher extends Closeable {
void connect(Configuration conf) throws IOException;
void publish(ClusterMetrics cs);
@Override
void close();
}
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
public static class MulticastPublisher implements Publisher {
private DatagramChannel channel;
private final EventLoopGroup group = new NioEventLoopGroup(
1, Threads.newDaemonThreadFactory("hbase-master-clusterStatusPublisher"));
public MulticastPublisher() {
}
@Override
public void connect(Configuration conf) throws IOException {
String mcAddress = conf.get(HConstants.STATUS_MULTICAST_ADDRESS,
HConstants.DEFAULT_STATUS_MULTICAST_ADDRESS);
int port = conf.getInt(HConstants.STATUS_MULTICAST_PORT,
HConstants.DEFAULT_STATUS_MULTICAST_PORT);
String bindAddress = conf.get(HConstants.STATUS_MULTICAST_PUBLISHER_BIND_ADDRESS,
HConstants.DEFAULT_STATUS_MULTICAST_PUBLISHER_BIND_ADDRESS);
String niName = conf.get(HConstants.STATUS_MULTICAST_NI_NAME);
final InetAddress ina;
try {
ina = InetAddress.getByName(mcAddress);
} catch (UnknownHostException e) {
close();
throw new IOException("Can't connect to " + mcAddress, e);
}
final InetSocketAddress isa = new InetSocketAddress(mcAddress, port);
InternetProtocolFamily family;
NetworkInterface ni;
if (niName != null) {
if (ina instanceof Inet6Address) {
family = InternetProtocolFamily.IPv6;
} else {
family = InternetProtocolFamily.IPv4;
}
ni = NetworkInterface.getByName(niName);
} else {
InetAddress localAddress;
if (ina instanceof Inet6Address) {
localAddress = Addressing.getIp6Address();
family = InternetProtocolFamily.IPv6;
} else {
localAddress = Addressing.getIp4Address();
family = InternetProtocolFamily.IPv4;
}
ni = NetworkInterface.getByInetAddress(localAddress);
}
Bootstrap b = new Bootstrap();
b.group(group)
.channelFactory(new HBaseDatagramChannelFactory(NioDatagramChannel.class, family))
.option(ChannelOption.SO_REUSEADDR, true)
.handler(new ClusterMetricsEncoder(isa));
try {
channel = (DatagramChannel) b.bind(bindAddress, 0).sync().channel();
channel.joinGroup(ina, ni, null, channel.newPromise()).sync();
channel.connect(isa).sync();
} catch (InterruptedException e) {
close();
throw ExceptionUtil.asInterrupt(e);
}
}
private static final class HBaseDatagramChannelFactory
implements ChannelFactory {
private final Class clazz;
private InternetProtocolFamily family;
HBaseDatagramChannelFactory(Class clazz, InternetProtocolFamily family) {
this.clazz = clazz;
this.family = family;
}
@Override
public T newChannel() {
try {
return ReflectionUtils.instantiateWithCustomCtor(clazz.getName(),
new Class[] { InternetProtocolFamily.class }, new Object[] { family });
} catch (Throwable t) {
throw new ChannelException("Unable to create Channel from class " + clazz, t);
}
}
@Override
public String toString() {
return StringUtil.simpleClassName(clazz) + ".class";
}
}
private static final class ClusterMetricsEncoder
extends MessageToMessageEncoder {
final private InetSocketAddress isa;
private ClusterMetricsEncoder(InetSocketAddress isa) {
this.isa = isa;
}
@Override
protected void encode(ChannelHandlerContext channelHandlerContext,
ClusterMetrics clusterStatus, List