/**
*
* 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;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hbase.master.RegionState;
import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.protobuf.generated.ClusterStatusProtos;
import org.apache.hadoop.hbase.protobuf.generated.ClusterStatusProtos.LiveServerInfo;
import org.apache.hadoop.hbase.protobuf.generated.ClusterStatusProtos.RegionInTransition;
import org.apache.hadoop.hbase.protobuf.generated.FSProtos.HBaseVersionFileContent;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionSpecifier;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionSpecifier.RegionSpecifierType;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.VersionedWritable;
import com.google.protobuf.ByteString;
/**
* Status information on the HBase cluster.
* <p>
* <tt>ClusterStatus</tt> provides clients with information such as:
* <ul>
* <li>The count and names of region servers in the cluster.</li>
* <li>The count and names of dead region servers in the cluster.</li>
* <li>The name of the active master for the cluster.</li>
* <li>The name(s) of the backup master(s) for the cluster, if they exist.</li>
* <li>The average cluster load.</li>
* <li>The number of regions deployed on the cluster.</li>
* <li>The number of requests since last report.</li>
* <li>Detailed region server loading and resource usage information,
* per server and per region.</li>
* <li>Regions in transition at master</li>
* <li>The unique cluster ID</li>
* </ul>
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class ClusterStatus extends VersionedWritable {
/**
* Version for object serialization. Incremented for changes in serialized
* representation.
* <dl>
* <dt>0</dt> <dd>Initial version</dd>
* <dt>1</dt> <dd>Added cluster ID</dd>
* <dt>2</dt> <dd>Added Map of ServerName to ServerLoad</dd>
* <dt>3</dt> <dd>Added master and backupMasters</dd>
* </dl>
*/
private static final byte VERSION = 2;
private String hbaseVersion;
private Map<ServerName, ServerLoad> liveServers;
private Collection<ServerName> deadServers;
private ServerName master;
private Collection<ServerName> backupMasters;
private Map<String, RegionState> intransition;
private String clusterId;
private String[] masterCoprocessors;
private boolean balancerOn;
/**
* Constructor, for Writable
* @deprecated Used by Writables and Writables are going away.
*/
@Deprecated
public ClusterStatus() {
super();
}
public ClusterStatus(final String hbaseVersion, final String clusterid,
final Map<ServerName, ServerLoad> servers,
final Collection<ServerName> deadServers,
final ServerName master,
final Collection<ServerName> backupMasters,
final Map<String, RegionState> rit,
final String[] masterCoprocessors,
final boolean balancerOn) {
this.hbaseVersion = hbaseVersion;
this.liveServers = servers;
this.deadServers = deadServers;
this.master = master;
this.backupMasters = backupMasters;
this.intransition = rit;
this.clusterId = clusterid;
this.masterCoprocessors = masterCoprocessors;
this.balancerOn = balancerOn;
}
/**
* @return the names of region servers on the dead list
*/
public Collection<ServerName> getDeadServerNames() {
return Collections.unmodifiableCollection(deadServers);
}
/**
* @return the number of region servers in the cluster
*/
public int getServersSize() {
return liveServers.size();
}
/**
* @return the number of dead region servers in the cluster
*/
public int getDeadServers() {
return deadServers.size();
}
/**
* @return the average cluster load
*/
public double getAverageLoad() {
int load = getRegionsCount();
return (double)load / (double)getServersSize();
}
/**
* @return the number of regions deployed on the cluster
*/
public int getRegionsCount() {
int count = 0;
for (Map.Entry<ServerName, ServerLoad> e: this.liveServers.entrySet()) {
count += e.getValue().getNumberOfRegions();
}
return count;
}
/**
* @return the number of requests since last report
*/
public int getRequestsCount() {
int count = 0;
for (Map.Entry<ServerName, ServerLoad> e: this.liveServers.entrySet()) {
count += e.getValue().getTotalNumberOfRequests();
}
return count;
}
/**
* @return the HBase version string as reported by the HMaster
*/
public String getHBaseVersion() {
return hbaseVersion;
}
/**
* @see java.lang.Object#equals(java.lang.Object)
*/
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof ClusterStatus)) {
return false;
}
return (getVersion() == ((ClusterStatus)o).getVersion()) &&
getHBaseVersion().equals(((ClusterStatus)o).getHBaseVersion()) &&
this.liveServers.equals(((ClusterStatus)o).liveServers) &&
this.deadServers.containsAll(((ClusterStatus)o).deadServers) &&
Arrays.equals(this.masterCoprocessors,
((ClusterStatus)o).masterCoprocessors) &&
this.master.equals(((ClusterStatus)o).master) &&
this.backupMasters.containsAll(((ClusterStatus)o).backupMasters);
}
/**
* @see java.lang.Object#hashCode()
*/
public int hashCode() {
return VERSION + hbaseVersion.hashCode() + this.liveServers.hashCode() +
this.deadServers.hashCode() + this.master.hashCode() +
this.backupMasters.hashCode();
}
/** @return the object version number */
public byte getVersion() {
return VERSION;
}
//
// Getters
//
/**
* Returns detailed region server information: A list of
* {@link ServerName}.
* @return region server information
* @deprecated Use {@link #getServers()}
*/
public Collection<ServerName> getServerInfo() {
return getServers();
}
public Collection<ServerName> getServers() {
return Collections.unmodifiableCollection(this.liveServers.keySet());
}
/**
* Returns detailed information about the current master {@link ServerName}.
* @return current master information if it exists
*/
public ServerName getMaster() {
return this.master;
}
/**
* @return the number of backup masters in the cluster
*/
public int getBackupMastersSize() {
return this.backupMasters.size();
}
/**
* @return the names of backup masters
*/
public Collection<ServerName> getBackupMasters() {
return Collections.unmodifiableCollection(this.backupMasters);
}
/**
* @param sn
* @return Server's load or null if not found.
*/
public ServerLoad getLoad(final ServerName sn) {
return this.liveServers.get(sn);
}
public Map<String, RegionState> getRegionsInTransition() {
return this.intransition;
}
public String getClusterId() {
return clusterId;
}
public String[] getMasterCoprocessors() {
return masterCoprocessors;
}
public boolean isBalancerOn() {
return balancerOn;
}
/**
* Convert a ClutserStatus to a protobuf ClusterStatus
*
* @return the protobuf ClusterStatus
*/
public ClusterStatusProtos.ClusterStatus convert() {
ClusterStatusProtos.ClusterStatus.Builder builder = ClusterStatusProtos.ClusterStatus.newBuilder();
builder.setHbaseVersion(HBaseVersionFileContent.newBuilder().setVersion(getHBaseVersion()));
for (Map.Entry<ServerName, ServerLoad> entry : liveServers.entrySet()) {
LiveServerInfo.Builder lsi =
LiveServerInfo.newBuilder().setServer(ProtobufUtil.toServerName(entry.getKey()));
lsi.setServerLoad(entry.getValue().obtainServerLoadPB());
builder.addLiveServers(lsi.build());
}
for (ServerName deadServer : getDeadServerNames()) {
builder.addDeadServers(ProtobufUtil.toServerName(deadServer));
}
for (Map.Entry<String, RegionState> rit : getRegionsInTransition().entrySet()) {
ClusterStatusProtos.RegionState rs = rit.getValue().convert();
RegionSpecifier.Builder spec =
RegionSpecifier.newBuilder().setType(RegionSpecifierType.REGION_NAME);
spec.setValue(ByteString.copyFrom(Bytes.toBytes(rit.getKey())));
RegionInTransition pbRIT =
RegionInTransition.newBuilder().setSpec(spec.build()).setRegionState(rs).build();
builder.addRegionsInTransition(pbRIT);
}
builder.setClusterId(new ClusterId(getClusterId()).convert());
for (String coprocessor : getMasterCoprocessors()) {
builder.addMasterCoprocessors(HBaseProtos.Coprocessor.newBuilder().setName(coprocessor));
}
builder.setMaster(
ProtobufUtil.toServerName(getMaster()));
for (ServerName backup : getBackupMasters()) {
builder.addBackupMasters(ProtobufUtil.toServerName(backup));
}
builder.setBalancerOn(balancerOn);
return builder.build();
}
/**
* Convert a protobuf ClusterStatus to a ClusterStatus
*
* @param proto the protobuf ClusterStatus
* @return the converted ClusterStatus
*/
public static ClusterStatus convert(ClusterStatusProtos.ClusterStatus proto) {
Map<ServerName, ServerLoad> servers = new HashMap<ServerName, ServerLoad>();
for (LiveServerInfo lsi : proto.getLiveServersList()) {
servers.put(ProtobufUtil.toServerName(lsi.getServer()), new ServerLoad(lsi.getServerLoad()));
}
Collection<ServerName> deadServers = new LinkedList<ServerName>();
for (HBaseProtos.ServerName sn : proto.getDeadServersList()) {
deadServers.add(ProtobufUtil.toServerName(sn));
}
Collection<ServerName> backupMasters = new LinkedList<ServerName>();
for (HBaseProtos.ServerName sn : proto.getBackupMastersList()) {
backupMasters.add(ProtobufUtil.toServerName(sn));
}
final Map<String, RegionState> rit = new HashMap<String, RegionState>();
for (RegionInTransition region : proto.getRegionsInTransitionList()) {
String key = new String(region.getSpec().getValue().toByteArray());
RegionState value = RegionState.convert(region.getRegionState());
rit.put(key,value);
}
final String[] masterCoprocessors = proto.getMasterCoprocessorsList().toArray(new String[0]);
return new ClusterStatus(proto.getHbaseVersion().getVersion(),
ClusterId.convert(proto.getClusterId()).toString(),servers,deadServers,
ProtobufUtil.toServerName(proto.getMaster()),backupMasters,rit,masterCoprocessors,
proto.getBalancerOn());
}
}