/**
*
* 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.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import javax.management.ObjectName;
import com.google.common.collect.Maps;
import com.google.protobuf.Descriptors;
import com.google.protobuf.Message;
import com.google.protobuf.RpcCallback;
import com.google.protobuf.Service;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Abortable;
import org.apache.hadoop.hbase.Chore;
import org.apache.hadoop.hbase.ClusterId;
import org.apache.hadoop.hbase.ClusterStatus;
import org.apache.hadoop.hbase.DeserializationException;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.MasterAdminProtocol;
import org.apache.hadoop.hbase.MasterMonitorProtocol;
import org.apache.hadoop.hbase.MasterNotRunningException;
import org.apache.hadoop.hbase.NotAllMetaRegionsOnlineException;
import org.apache.hadoop.hbase.PleaseHoldException;
import org.apache.hadoop.hbase.RegionServerStatusProtocol;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.ServerLoad;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.TableDescriptors;
import org.apache.hadoop.hbase.TableNotDisabledException;
import org.apache.hadoop.hbase.TableNotFoundException;
import org.apache.hadoop.hbase.UnknownRegionException;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
import org.apache.hadoop.hbase.catalog.CatalogTracker;
import org.apache.hadoop.hbase.catalog.MetaReader;
import org.apache.hadoop.hbase.client.HConnectionManager;
import org.apache.hadoop.hbase.client.MetaScanner;
import org.apache.hadoop.hbase.client.MetaScanner.MetaScannerVisitor;
import org.apache.hadoop.hbase.client.MetaScanner.MetaScannerVisitorBase;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.coprocessor.CoprocessorHost;
import org.apache.hadoop.hbase.executor.ExecutorService;
import org.apache.hadoop.hbase.executor.ExecutorService.ExecutorType;
import org.apache.hadoop.hbase.ipc.HBaseRPC;
import org.apache.hadoop.hbase.ipc.HBaseServer;
import org.apache.hadoop.hbase.ipc.ProtocolSignature;
import org.apache.hadoop.hbase.ipc.RpcServer;
import org.apache.hadoop.hbase.ipc.ServerRpcController;
import org.apache.hadoop.hbase.master.balancer.BalancerChore;
import org.apache.hadoop.hbase.master.balancer.ClusterStatusChore;
import org.apache.hadoop.hbase.master.balancer.LoadBalancerFactory;
import org.apache.hadoop.hbase.master.cleaner.HFileCleaner;
import org.apache.hadoop.hbase.master.cleaner.LogCleaner;
import org.apache.hadoop.hbase.master.handler.CreateTableHandler;
import org.apache.hadoop.hbase.master.handler.DeleteTableHandler;
import org.apache.hadoop.hbase.master.handler.DisableTableHandler;
import org.apache.hadoop.hbase.master.handler.EnableTableHandler;
import org.apache.hadoop.hbase.master.handler.ModifyTableHandler;
import org.apache.hadoop.hbase.master.handler.ServerShutdownHandler;
import org.apache.hadoop.hbase.master.handler.TableAddFamilyHandler;
import org.apache.hadoop.hbase.master.handler.TableDeleteFamilyHandler;
import org.apache.hadoop.hbase.master.handler.TableEventHandler;
import org.apache.hadoop.hbase.master.handler.TableModifyFamilyHandler;
import org.apache.hadoop.hbase.monitoring.MemoryBoundedLogMessageBuffer;
import org.apache.hadoop.hbase.monitoring.MonitoredTask;
import org.apache.hadoop.hbase.monitoring.TaskMonitor;
import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.protobuf.RequestConverter;
import org.apache.hadoop.hbase.protobuf.ResponseConverter;
import org.apache.hadoop.hbase.protobuf.generated.ClientProtos;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.NameStringPair;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionSpecifier.RegionSpecifierType;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.AddColumnRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.AddColumnResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.AssignRegionRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.AssignRegionResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.BalanceRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.BalanceResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.CatalogScanRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.CatalogScanResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.CreateTableRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.CreateTableResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.DeleteColumnRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.DeleteColumnResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.DeleteTableRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.DeleteTableResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.DisableTableRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.DisableTableResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.EnableCatalogJanitorRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.EnableCatalogJanitorResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.EnableTableRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.EnableTableResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.IsCatalogJanitorEnabledRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.IsCatalogJanitorEnabledResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.ModifyColumnRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.ModifyColumnResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.ModifyTableRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.ModifyTableResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.MoveRegionRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.MoveRegionResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.OfflineRegionRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.OfflineRegionResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.SetBalancerRunningRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.SetBalancerRunningResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.ShutdownRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.ShutdownResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.StopMasterRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.StopMasterResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.UnassignRegionRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos.UnassignRegionResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterMonitorProtos.GetClusterStatusRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterMonitorProtos.GetClusterStatusResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterMonitorProtos.GetSchemaAlterStatusRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterMonitorProtos.GetSchemaAlterStatusResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterMonitorProtos.GetTableDescriptorsRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterMonitorProtos.GetTableDescriptorsResponse;
import org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsMasterRunningRequest;
import org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsMasterRunningResponse;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.GetLastFlushedSequenceIdRequest;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.GetLastFlushedSequenceIdResponse;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.RegionServerReportRequest;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.RegionServerReportResponse;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.RegionServerStartupRequest;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.RegionServerStartupResponse;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.ReportRSFatalErrorRequest;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.ReportRSFatalErrorResponse;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.replication.regionserver.Replication;
import org.apache.hadoop.hbase.security.User;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.CompressionTest;
import org.apache.hadoop.hbase.util.FSTableDescriptors;
import org.apache.hadoop.hbase.util.HFileArchiveUtil;
import org.apache.hadoop.hbase.util.HasThread;
import org.apache.hadoop.hbase.util.InfoServer;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.hbase.util.Sleeper;
import org.apache.hadoop.hbase.util.Strings;
import org.apache.hadoop.hbase.util.Threads;
import org.apache.hadoop.hbase.util.VersionInfo;
import org.apache.hadoop.hbase.zookeeper.ClusterStatusTracker;
import org.apache.hadoop.hbase.zookeeper.DrainingServerTracker;
import org.apache.hadoop.hbase.zookeeper.LoadBalancerTracker;
import org.apache.hadoop.hbase.zookeeper.RegionServerTracker;
import org.apache.hadoop.hbase.zookeeper.ZKClusterId;
import org.apache.hadoop.hbase.zookeeper.ZKUtil;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
import org.apache.hadoop.metrics.util.MBeanUtil;
import org.apache.hadoop.net.DNS;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.Watcher;
import org.apache.hadoop.hbase.trace.SpanReceiverHost;
import org.apache.hadoop.hbase.util.FSUtils;
import com.google.protobuf.RpcController;
import com.google.protobuf.ServiceException;
/**
* HMaster is the "master server" for HBase. An HBase cluster has one active
* master. If many masters are started, all compete. Whichever wins goes on to
* run the cluster. All others park themselves in their constructor until
* master or cluster shutdown or until the active master loses its lease in
* zookeeper. Thereafter, all running master jostle to take over master role.
*
* <p>The Master can be asked shutdown the cluster. See {@link #shutdown()}. In
* this case it will tell all regionservers to go down and then wait on them
* all reporting in that they are down. This master will then shut itself down.
*
* <p>You can also shutdown just this master. Call {@link #stopMaster()}.
*
* @see MasterMonitorProtocol
* @see MasterAdminProtocol
* @see RegionServerStatusProtocol
* @see Watcher
*/
@InterfaceAudience.Private
@SuppressWarnings("deprecation")
public class HMaster extends HasThread
implements MasterMonitorProtocol, MasterAdminProtocol, RegionServerStatusProtocol, MasterServices,
Server {
private static final Log LOG = LogFactory.getLog(HMaster.class.getName());
// MASTER is name of the webapp and the attribute name used stuffing this
//instance into web context.
public static final String MASTER = "master";
// The configuration for the Master
private final Configuration conf;
// server for the web ui
private InfoServer infoServer;
// Our zk client.
private ZooKeeperWatcher zooKeeper;
// Manager and zk listener for master election
private ActiveMasterManager activeMasterManager;
// Region server tracker
private RegionServerTracker regionServerTracker;
// Draining region server tracker
private DrainingServerTracker drainingServerTracker;
// Tracker for load balancer state
private LoadBalancerTracker loadBalancerTracker;
// RPC server for the HMaster
private final RpcServer rpcServer;
// Set after we've called HBaseServer#openServer and ready to receive RPCs.
// Set back to false after we stop rpcServer. Used by tests.
private volatile boolean rpcServerOpen = false;
/**
* This servers address.
*/
private final InetSocketAddress isa;
// Metrics for the HMaster
private final MetricsMaster metricsMaster;
// file system manager for the master FS operations
private MasterFileSystem fileSystemManager;
// server manager to deal with region server info
private ServerManager serverManager;
// manager of assignment nodes in zookeeper
AssignmentManager assignmentManager;
// manager of catalog regions
private CatalogTracker catalogTracker;
// Cluster status zk tracker and local setter
private ClusterStatusTracker clusterStatusTracker;
// buffer for "fatal error" notices from region servers
// in the cluster. This is only used for assisting
// operations/debugging.
private MemoryBoundedLogMessageBuffer rsFatals;
// This flag is for stopping this Master instance. Its set when we are
// stopping or aborting
private volatile boolean stopped = false;
// Set on abort -- usually failure of our zk session.
private volatile boolean abort = false;
// flag set after we become the active master (used for testing)
private volatile boolean isActiveMaster = false;
// flag set after we complete initialization once active (used for testing)
private volatile boolean initialized = false;
// flag set after we complete assignRootAndMeta.
private volatile boolean serverShutdownHandlerEnabled = false;
// Instance of the hbase executor service.
ExecutorService executorService;
private LoadBalancer balancer;
private Thread balancerChore;
private Thread clusterStatusChore;
private CatalogJanitor catalogJanitorChore;
private LogCleaner logCleaner;
private HFileCleaner hfileCleaner;
private MasterCoprocessorHost cpHost;
private final ServerName serverName;
private TableDescriptors tableDescriptors;
// Time stamps for when a hmaster was started and when it became active
private long masterStartTime;
private long masterActiveTime;
/** time interval for emitting metrics values */
private final int msgInterval;
/**
* MX Bean for MasterInfo
*/
private ObjectName mxBean = null;
//should we check the compression codec type at master side, default true, HBASE-6370
private final boolean masterCheckCompression;
private SpanReceiverHost spanReceiverHost;
private Map<String, Service> coprocessorServiceHandlers = Maps.newHashMap();
/**
* Initializes the HMaster. The steps are as follows:
* <p>
* <ol>
* <li>Initialize HMaster RPC and address
* <li>Connect to ZooKeeper.
* </ol>
* <p>
* Remaining steps of initialization occur in {@link #run()} so that they
* run in their own thread rather than within the context of the constructor.
* @throws InterruptedException
*/
public HMaster(final Configuration conf)
throws IOException, KeeperException, InterruptedException {
this.conf = new Configuration(conf);
LOG.info("hbase.rootdir=" + FSUtils.getRootDir(this.conf) +
", hbase.cluster.distributed=" + this.conf.getBoolean("hbase.cluster.distributed", false));
// Disable the block cache on the master
this.conf.setFloat(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY, 0.0f);
// Set how many times to retry talking to another server over HConnection.
HConnectionManager.setServerSideHConnectionRetries(this.conf, LOG);
// Server to handle client requests.
String hostname = Strings.domainNamePointerToHostName(DNS.getDefaultHost(
conf.get("hbase.master.dns.interface", "default"),
conf.get("hbase.master.dns.nameserver", "default")));
int port = conf.getInt(HConstants.MASTER_PORT, HConstants.DEFAULT_MASTER_PORT);
// Creation of a ISA will force a resolve.
InetSocketAddress initialIsa = new InetSocketAddress(hostname, port);
if (initialIsa.getAddress() == null) {
throw new IllegalArgumentException("Failed resolve of " + initialIsa);
}
int numHandlers = conf.getInt("hbase.master.handler.count",
conf.getInt("hbase.regionserver.handler.count", 25));
this.rpcServer = HBaseRPC.getServer(MasterMonitorProtocol.class, this,
new Class<?>[]{MasterMonitorProtocol.class,
MasterAdminProtocol.class, RegionServerStatusProtocol.class},
initialIsa.getHostName(), // BindAddress is IP we got for this server.
initialIsa.getPort(),
numHandlers,
0, // we dont use high priority handlers in master
conf.getBoolean("hbase.rpc.verbose", false), conf,
0); // this is a DNC w/o high priority handlers
// Set our address.
this.isa = this.rpcServer.getListenerAddress();
this.serverName = new ServerName(this.isa.getHostName(),
this.isa.getPort(), System.currentTimeMillis());
this.rsFatals = new MemoryBoundedLogMessageBuffer(
conf.getLong("hbase.master.buffer.for.rs.fatals", 1*1024*1024));
// initialize server principal (if using secure Hadoop)
User.login(conf, "hbase.master.keytab.file",
"hbase.master.kerberos.principal", this.isa.getHostName());
// set the thread name now we have an address
setName(MASTER + "-" + this.serverName.toString());
Replication.decorateMasterConfiguration(this.conf);
// Hack! Maps DFSClient => Master for logs. HDFS made this
// config param for task trackers, but we can piggyback off of it.
if (this.conf.get("mapred.task.id") == null) {
this.conf.set("mapred.task.id", "hb_m_" + this.serverName.toString());
}
this.zooKeeper = new ZooKeeperWatcher(conf, MASTER + ":" + isa.getPort(), this, true);
this.rpcServer.startThreads();
// metrics interval: using the same property as region server.
this.msgInterval = conf.getInt("hbase.regionserver.msginterval", 3 * 1000);
//should we check the compression codec type at master side, default true, HBASE-6370
this.masterCheckCompression = conf.getBoolean("hbase.master.check.compression", true);
this.metricsMaster = new MetricsMaster( new MetricsMasterWrapperImpl(this));
}
/**
* Stall startup if we are designated a backup master; i.e. we want someone
* else to become the master before proceeding.
* @param c
* @param amm
* @throws InterruptedException
*/
private static void stallIfBackupMaster(final Configuration c,
final ActiveMasterManager amm)
throws InterruptedException {
// If we're a backup master, stall until a primary to writes his address
if (!c.getBoolean(HConstants.MASTER_TYPE_BACKUP,
HConstants.DEFAULT_MASTER_TYPE_BACKUP)) {
return;
}
LOG.debug("HMaster started in backup mode. " +
"Stalling until master znode is written.");
// This will only be a minute or so while the cluster starts up,
// so don't worry about setting watches on the parent znode
while (!amm.isActiveMaster()) {
LOG.debug("Waiting for master address ZNode to be written " +
"(Also watching cluster state node)");
Thread.sleep(c.getInt("zookeeper.session.timeout", 180 * 1000));
}
}
MetricsMaster getMetrics() {
return metricsMaster;
}
/**
* Main processing loop for the HMaster.
* <ol>
* <li>Block until becoming active master
* <li>Finish initialization via finishInitialization(MonitoredTask)
* <li>Enter loop until we are stopped
* <li>Stop services and perform cleanup once stopped
* </ol>
*/
@Override
public void run() {
MonitoredTask startupStatus =
TaskMonitor.get().createStatus("Master startup");
startupStatus.setDescription("Master startup");
masterStartTime = System.currentTimeMillis();
try {
/*
* Block on becoming the active master.
*
* We race with other masters to write our address into ZooKeeper. If we
* succeed, we are the primary/active master and finish initialization.
*
* If we do not succeed, there is another active master and we should
* now wait until it dies to try and become the next active master. If we
* do not succeed on our first attempt, this is no longer a cluster startup.
*/
becomeActiveMaster(startupStatus);
// We are either the active master or we were asked to shutdown
if (!this.stopped) {
finishInitialization(startupStatus, false);
loop();
}
} catch (Throwable t) {
// HBASE-5680: Likely hadoop23 vs hadoop 20.x/1.x incompatibility
if (t instanceof NoClassDefFoundError &&
t.getMessage().contains("org/apache/hadoop/hdfs/protocol/FSConstants$SafeModeAction")) {
// improved error message for this special case
abort("HBase is having a problem with its Hadoop jars. You may need to "
+ "recompile HBase against Hadoop version "
+ org.apache.hadoop.util.VersionInfo.getVersion()
+ " or change your hadoop jars to start properly", t);
} else {
abort("Unhandled exception. Starting shutdown.", t);
}
} finally {
startupStatus.cleanup();
stopChores();
// Wait for all the remaining region servers to report in IFF we were
// running a cluster shutdown AND we were NOT aborting.
if (!this.abort && this.serverManager != null &&
this.serverManager.isClusterShutdown()) {
this.serverManager.letRegionServersShutdown();
}
stopServiceThreads();
// Stop services started for both backup and active masters
if (this.activeMasterManager != null) this.activeMasterManager.stop();
if (this.catalogTracker != null) this.catalogTracker.stop();
if (this.serverManager != null) this.serverManager.stop();
if (this.assignmentManager != null) this.assignmentManager.stop();
if (this.fileSystemManager != null) this.fileSystemManager.stop();
this.zooKeeper.close();
}
LOG.info("HMaster main thread exiting");
}
/**
* Try becoming active master.
* @param startupStatus
* @return True if we could successfully become the active master.
* @throws InterruptedException
*/
private boolean becomeActiveMaster(MonitoredTask startupStatus)
throws InterruptedException {
// TODO: This is wrong!!!! Should have new servername if we restart ourselves,
// if we come back to life.
this.activeMasterManager = new ActiveMasterManager(zooKeeper, this.serverName,
this);
this.zooKeeper.registerListener(activeMasterManager);
stallIfBackupMaster(this.conf, this.activeMasterManager);
// The ClusterStatusTracker is setup before the other
// ZKBasedSystemTrackers because it's needed by the activeMasterManager
// to check if the cluster should be shutdown.
this.clusterStatusTracker = new ClusterStatusTracker(getZooKeeper(), this);
this.clusterStatusTracker.start();
return this.activeMasterManager.blockUntilBecomingActiveMaster(startupStatus,
this.clusterStatusTracker);
}
/**
* Initialize all ZK based system trackers.
* @throws IOException
* @throws InterruptedException
*/
private void initializeZKBasedSystemTrackers() throws IOException,
InterruptedException, KeeperException {
this.catalogTracker = createCatalogTracker(this.zooKeeper, this.conf,
this, conf.getInt("hbase.master.catalog.timeout", 600000));
this.catalogTracker.start();
this.balancer = LoadBalancerFactory.getLoadBalancer(conf);
this.loadBalancerTracker = new LoadBalancerTracker(zooKeeper, this);
this.loadBalancerTracker.start();
this.assignmentManager = new AssignmentManager(this, serverManager,
this.catalogTracker, this.balancer, this.executorService, this.metricsMaster);
zooKeeper.registerListenerFirst(assignmentManager);
this.regionServerTracker = new RegionServerTracker(zooKeeper, this,
this.serverManager);
this.regionServerTracker.start();
this.drainingServerTracker = new DrainingServerTracker(zooKeeper, this,
this.serverManager);
this.drainingServerTracker.start();
// Set the cluster as up. If new RSs, they'll be waiting on this before
// going ahead with their startup.
boolean wasUp = this.clusterStatusTracker.isClusterUp();
if (!wasUp) this.clusterStatusTracker.setClusterUp();
LOG.info("Server active/primary master; " + this.serverName +
", sessionid=0x" +
Long.toHexString(this.zooKeeper.getRecoverableZooKeeper().getSessionId()) +
", cluster-up flag was=" + wasUp);
}
/**
* Create CatalogTracker.
* In its own method so can intercept and mock it over in tests.
* @param zk If zk is null, we'll create an instance (and shut it down
* when {@link #stop()} is called) else we'll use what is passed.
* @param conf
* @param abortable If fatal exception we'll call abort on this. May be null.
* If it is we'll use the Connection associated with the passed
* {@link Configuration} as our {@link Abortable}.
* @param defaultTimeout Timeout to use. Pass zero for no timeout
* ({@link Object#wait(long)} when passed a <code>0</code> waits for ever).
* @throws IOException
*/
CatalogTracker createCatalogTracker(final ZooKeeperWatcher zk,
final Configuration conf, Abortable abortable, final int defaultTimeout)
throws IOException {
return new CatalogTracker(zk, conf, abortable, defaultTimeout);
}
// Check if we should stop every 100ms
private Sleeper stopSleeper = new Sleeper(100, this);
private void loop() {
long lastMsgTs = 0l;
long now = 0l;
while (!this.stopped) {
now = System.currentTimeMillis();
if ((now - lastMsgTs) >= this.msgInterval) {
doMetrics();
lastMsgTs = System.currentTimeMillis();
}
stopSleeper.sleep();
}
}
/**
* Emit the HMaster metrics, such as region in transition metrics.
* Surrounding in a try block just to be sure metrics doesn't abort HMaster.
*/
private void doMetrics() {
try {
this.assignmentManager.updateRegionsInTransitionMetrics();
} catch (Throwable e) {
LOG.error("Couldn't update metrics: " + e.getMessage());
}
}
/**
* Finish initialization of HMaster after becoming the primary master.
*
* <ol>
* <li>Initialize master components - file system manager, server manager,
* assignment manager, region server tracker, catalog tracker, etc</li>
* <li>Start necessary service threads - rpc server, info server,
* executor services, etc</li>
* <li>Set cluster as UP in ZooKeeper</li>
* <li>Wait for RegionServers to check-in</li>
* <li>Split logs and perform data recovery, if necessary</li>
* <li>Ensure assignment of root and meta regions<li>
* <li>Handle either fresh cluster start or master failover</li>
* </ol>
*
* @param masterRecovery
*
* @throws IOException
* @throws InterruptedException
* @throws KeeperException
*/
private void finishInitialization(MonitoredTask status, boolean masterRecovery)
throws IOException, InterruptedException, KeeperException {
isActiveMaster = true;
/*
* We are active master now... go initialize components we need to run.
* Note, there may be dross in zk from previous runs; it'll get addressed
* below after we determine if cluster startup or failover.
*/
status.setStatus("Initializing Master file system");
this.masterActiveTime = System.currentTimeMillis();
// TODO: Do this using Dependency Injection, using PicoContainer, Guice or Spring.
this.fileSystemManager = new MasterFileSystem(this, this, metricsMaster, masterRecovery);
this.tableDescriptors =
new FSTableDescriptors(this.fileSystemManager.getFileSystem(),
this.fileSystemManager.getRootDir());
// publish cluster ID
status.setStatus("Publishing Cluster ID in ZooKeeper");
ZKClusterId.setClusterId(this.zooKeeper, fileSystemManager.getClusterId());
if (!masterRecovery) {
this.executorService = new ExecutorService(getServerName().toString());
this.serverManager = createServerManager(this, this);
}
status.setStatus("Initializing ZK system trackers");
initializeZKBasedSystemTrackers();
if (!masterRecovery) {
// initialize master side coprocessors before we start handling requests
status.setStatus("Initializing master coprocessors");
this.cpHost = new MasterCoprocessorHost(this, this.conf);
spanReceiverHost = new SpanReceiverHost(getConfiguration());
spanReceiverHost.loadSpanReceivers();
// start up all service threads.
status.setStatus("Initializing master service threads");
startServiceThreads();
}
// Wait for region servers to report in.
this.serverManager.waitForRegionServers(status);
// Check zk for region servers that are up but didn't register
for (ServerName sn: this.regionServerTracker.getOnlineServers()) {
if (!this.serverManager.isServerOnline(sn)) {
// Not registered; add it.
LOG.info("Registering server found up in zk but who has not yet " +
"reported in: " + sn);
this.serverManager.recordNewServer(sn, ServerLoad.EMPTY_SERVERLOAD);
}
}
if (!masterRecovery) {
this.assignmentManager.startTimeOutMonitor();
}
// TODO: Should do this in background rather than block master startup
status.setStatus("Splitting logs after master startup");
splitLogAfterStartup(this.fileSystemManager);
// Make sure root and meta assigned before proceeding.
if (!assignRootAndMeta(status)) return;
enableServerShutdownHandler();
// Update meta with new PB serialization if required. i.e migrate all HRI
// to PB serialization in meta and update the status in ROOT. This must happen
// before we assign all user regions or else the assignment will fail.
// TODO: Remove this after 0.96, when we do 0.98.
org.apache.hadoop.hbase.catalog.MetaMigrationConvertingToPB
.updateRootAndMetaIfNecessary(this);
this.balancer.setMasterServices(this);
// Fix up assignment manager status
status.setStatus("Starting assignment manager");
this.assignmentManager.joinCluster();
this.balancer.setClusterStatus(getClusterStatus());
// Fixing up missing daughters if any
status.setStatus("Fixing up missing daughters");
fixupDaughters(status);
if (!masterRecovery) {
// Start balancer and meta catalog janitor after meta and regions have
// been assigned.
status.setStatus("Starting balancer and catalog janitor");
this.clusterStatusChore = getAndStartClusterStatusChore(this);
this.balancerChore = getAndStartBalancerChore(this);
this.catalogJanitorChore = new CatalogJanitor(this, this);
startCatalogJanitorChore();
}
status.markComplete("Initialization successful");
LOG.info("Master has completed initialization");
initialized = true;
// clear the dead servers with same host name and port of online server because we are not
// removing dead server with same hostname and port of rs which is trying to check in before
// master initialization. See HBASE-5916.
this.serverManager.clearDeadServersWithSameHostNameAndPortOfOnlineServer();
if (!masterRecovery) {
if (this.cpHost != null) {
// don't let cp initialization errors kill the master
try {
this.cpHost.postStartMaster();
} catch (IOException ioe) {
LOG.error("Coprocessor postStartMaster() hook failed", ioe);
}
}
}
}
/**
* Useful for testing purpose also where we have
* master restart scenarios.
*/
protected void startCatalogJanitorChore() {
Threads.setDaemonThreadRunning(catalogJanitorChore.getThread());
}
/**
* Override to change master's splitLogAfterStartup. Used testing
* @param mfs
*/
protected void splitLogAfterStartup(final MasterFileSystem mfs) {
mfs.splitLogAfterStartup();
}
/**
* Create a {@link ServerManager} instance.
* @param master
* @param services
* @return An instance of {@link ServerManager}
* @throws ZooKeeperConnectionException
* @throws IOException
*/
ServerManager createServerManager(final Server master,
final MasterServices services)
throws IOException {
// We put this out here in a method so can do a Mockito.spy and stub it out
// w/ a mocked up ServerManager.
return new ServerManager(master, services);
}
/**
* If ServerShutdownHandler is disabled, we enable it and expire those dead
* but not expired servers.
*/
private void enableServerShutdownHandler() {
if (!serverShutdownHandlerEnabled) {
serverShutdownHandlerEnabled = true;
this.serverManager.processQueuedDeadServers();
}
}
/**
* Check <code>-ROOT-</code> and <code>.META.</code> are assigned. If not,
* assign them.
* @throws InterruptedException
* @throws IOException
* @throws KeeperException
* @return True if root and meta are healthy, assigned
*/
boolean assignRootAndMeta(MonitoredTask status)
throws InterruptedException, IOException, KeeperException {
int assigned = 0;
long timeout = this.conf.getLong("hbase.catalog.verification.timeout", 1000);
// Work on ROOT region. Is it in zk in transition?
status.setStatus("Assigning ROOT region");
assignmentManager.getRegionStates().createRegionState(
HRegionInfo.ROOT_REGIONINFO);
boolean rit = this.assignmentManager.
processRegionInTransitionAndBlockUntilAssigned(HRegionInfo.ROOT_REGIONINFO);
ServerName currentRootServer = null;
boolean rootRegionLocation = catalogTracker.verifyRootRegionLocation(timeout);
if (!rit && !rootRegionLocation) {
currentRootServer = this.catalogTracker.getRootLocation();
splitLogAndExpireIfOnline(currentRootServer);
this.assignmentManager.assignRoot();
// Make sure a -ROOT- location is set.
if (!isRootLocation()) return false;
// This guarantees that the transition assigning -ROOT- has completed
this.assignmentManager.waitForAssignment(HRegionInfo.ROOT_REGIONINFO);
assigned++;
} else if (rit && !rootRegionLocation) {
// Make sure a -ROOT- location is set.
if (!isRootLocation()) return false;
// This guarantees that the transition assigning -ROOT- has completed
this.assignmentManager.waitForAssignment(HRegionInfo.ROOT_REGIONINFO);
assigned++;
} else if (rootRegionLocation) {
// Region already assigned. We didn't assign it. Add to in-memory state.
this.assignmentManager.regionOnline(HRegionInfo.ROOT_REGIONINFO,
this.catalogTracker.getRootLocation());
}
// Enable the ROOT table if on process fail over the RS containing ROOT
// was active.
enableCatalogTables(Bytes.toString(HConstants.ROOT_TABLE_NAME));
// Check for stopped, just in case
if (this.stopped) return false;
LOG.info("-ROOT- assigned=" + assigned + ", rit=" + rit +
", location=" + catalogTracker.getRootLocation());
// Work on meta region
status.setStatus("Assigning META region");
assignmentManager.getRegionStates().createRegionState(
HRegionInfo.FIRST_META_REGIONINFO);
rit = this.assignmentManager.
processRegionInTransitionAndBlockUntilAssigned(HRegionInfo.FIRST_META_REGIONINFO);
boolean metaRegionLocation = this.catalogTracker.verifyMetaRegionLocation(timeout);
if (!rit && !metaRegionLocation) {
ServerName currentMetaServer =
this.catalogTracker.getMetaLocationOrReadLocationFromRoot();
if (currentMetaServer != null
&& !currentMetaServer.equals(currentRootServer)) {
splitLogAndExpireIfOnline(currentMetaServer);
}
assignmentManager.assignMeta();
enableSSHandWaitForMeta();
assigned++;
} else if (rit && !metaRegionLocation) {
// Wait until META region added to region server onlineRegions. See HBASE-5875.
enableSSHandWaitForMeta();
assigned++;
} else {
// Region already assigned. We didn't assign it. Add to in-memory state.
this.assignmentManager.regionOnline(HRegionInfo.FIRST_META_REGIONINFO,
this.catalogTracker.getMetaLocation());
}
enableCatalogTables(Bytes.toString(HConstants.META_TABLE_NAME));
LOG.info(".META. assigned=" + assigned + ", rit=" + rit +
", location=" + catalogTracker.getMetaLocation());
status.setStatus("META and ROOT assigned.");
return true;
}
private void enableSSHandWaitForMeta() throws IOException, InterruptedException {
enableServerShutdownHandler();
this.catalogTracker.waitForMeta();
// Above check waits for general meta availability but this does not
// guarantee that the transition has completed
this.assignmentManager.waitForAssignment(HRegionInfo.FIRST_META_REGIONINFO);
}
/**
* @return True if there a root available
* @throws InterruptedException
*/
private boolean isRootLocation() throws InterruptedException {
// Cycle up here in master rather than down in catalogtracker so we can
// check the master stopped flag every so often.
while (!this.stopped) {
try {
if (this.catalogTracker.waitForRoot(100) != null) break;
} catch (NotAllMetaRegionsOnlineException e) {
// Ignore. I know -ROOT- is not online yet.
}
}
// We got here because we came of above loop.
return !this.stopped;
}
private void enableCatalogTables(String catalogTableName) {
if (!this.assignmentManager.getZKTable().isEnabledTable(catalogTableName)) {
this.assignmentManager.setEnabledTable(catalogTableName);
}
}
void fixupDaughters(final MonitoredTask status) throws IOException {
final Map<HRegionInfo, Result> offlineSplitParents =
new HashMap<HRegionInfo, Result>();
// This visitor collects offline split parents in the .META. table
MetaReader.Visitor visitor = new MetaReader.Visitor() {
@Override
public boolean visit(Result r) throws IOException {
if (r == null || r.isEmpty()) return true;
HRegionInfo info =
HRegionInfo.getHRegionInfo(r);
if (info == null) return true; // Keep scanning
if (info.isOffline() && info.isSplit()) {
offlineSplitParents.put(info, r);
}
// Returning true means "keep scanning"
return true;
}
};
// Run full scan of .META. catalog table passing in our custom visitor
MetaReader.fullScan(this.catalogTracker, visitor);
// Now work on our list of found parents. See if any we can clean up.
int fixups = 0;
for (Map.Entry<HRegionInfo, Result> e : offlineSplitParents.entrySet()) {
ServerName sn = HRegionInfo.getServerName(e.getValue());
if (!serverManager.isServerDead(sn)) { // Otherwise, let SSH take care of it
fixups += ServerShutdownHandler.fixupDaughters(
e.getValue(), assignmentManager, catalogTracker);
}
}
if (fixups != 0) {
LOG.info("Scanned the catalog and fixed up " + fixups +
" missing daughter region(s)");
}
}
/**
* Split a server's log and expire it if we find it is one of the online
* servers.
* @param sn ServerName to check.
* @throws IOException
*/
private void splitLogAndExpireIfOnline(final ServerName sn)
throws IOException {
if (sn == null || !serverManager.isServerOnline(sn)) {
return;
}
LOG.info("Forcing splitLog and expire of " + sn);
fileSystemManager.splitLog(sn);
serverManager.expireServer(sn);
}
@Override
public ProtocolSignature getProtocolSignature(
String protocol, long version, int clientMethodsHashCode)
throws IOException {
if (MasterMonitorProtocol.class.getName().equals(protocol)) {
return new ProtocolSignature(MasterMonitorProtocol.VERSION, null);
} else if (MasterAdminProtocol.class.getName().equals(protocol)) {
return new ProtocolSignature(MasterAdminProtocol.VERSION, null);
} else if (RegionServerStatusProtocol.class.getName().equals(protocol)) {
return new ProtocolSignature(RegionServerStatusProtocol.VERSION, null);
}
throw new IOException("Unknown protocol: " + protocol);
}
public long getProtocolVersion(String protocol, long clientVersion) {
if (MasterMonitorProtocol.class.getName().equals(protocol)) {
return MasterMonitorProtocol.VERSION;
} else if (MasterAdminProtocol.class.getName().equals(protocol)) {
return MasterAdminProtocol.VERSION;
} else if (RegionServerStatusProtocol.class.getName().equals(protocol)) {
return RegionServerStatusProtocol.VERSION;
}
// unknown protocol
LOG.warn("Version requested for unimplemented protocol: "+protocol);
return -1;
}
@Override
public TableDescriptors getTableDescriptors() {
return this.tableDescriptors;
}
/** @return InfoServer object. Maybe null.*/
public InfoServer getInfoServer() {
return this.infoServer;
}
@Override
public Configuration getConfiguration() {
return this.conf;
}
@Override
public ServerManager getServerManager() {
return this.serverManager;
}
@Override
public ExecutorService getExecutorService() {
return this.executorService;
}
@Override
public MasterFileSystem getMasterFileSystem() {
return this.fileSystemManager;
}
/**
* Get the ZK wrapper object - needed by master_jsp.java
* @return the zookeeper wrapper
*/
public ZooKeeperWatcher getZooKeeperWatcher() {
return this.zooKeeper;
}
/*
* Start up all services. If any of these threads gets an unhandled exception
* then they just die with a logged message. This should be fine because
* in general, we do not expect the master to get such unhandled exceptions
* as OOMEs; it should be lightly loaded. See what HRegionServer does if
* need to install an unexpected exception handler.
*/
void startServiceThreads() throws IOException{
// Start the executor service pools
this.executorService.startExecutorService(ExecutorType.MASTER_OPEN_REGION,
conf.getInt("hbase.master.executor.openregion.threads", 5));
this.executorService.startExecutorService(ExecutorType.MASTER_CLOSE_REGION,
conf.getInt("hbase.master.executor.closeregion.threads", 5));
this.executorService.startExecutorService(ExecutorType.MASTER_SERVER_OPERATIONS,
conf.getInt("hbase.master.executor.serverops.threads", 3));
this.executorService.startExecutorService(ExecutorType.MASTER_META_SERVER_OPERATIONS,
conf.getInt("hbase.master.executor.serverops.threads", 5));
// We depend on there being only one instance of this executor running
// at a time. To do concurrency, would need fencing of enable/disable of
// tables.
this.executorService.startExecutorService(ExecutorType.MASTER_TABLE_OPERATIONS, 1);
// Start log cleaner thread
String n = Thread.currentThread().getName();
int cleanerInterval = conf.getInt("hbase.master.cleaner.interval", 60 * 1000);
this.logCleaner =
new LogCleaner(cleanerInterval,
this, conf, getMasterFileSystem().getFileSystem(),
getMasterFileSystem().getOldLogDir());
Threads.setDaemonThreadRunning(logCleaner.getThread(), n + ".oldLogCleaner");
//start the hfile archive cleaner thread
Path archiveDir = HFileArchiveUtil.getArchivePath(conf);
this.hfileCleaner = new HFileCleaner(cleanerInterval, this, conf, getMasterFileSystem()
.getFileSystem(), archiveDir);
Threads.setDaemonThreadRunning(hfileCleaner.getThread(), n + ".archivedHFileCleaner");
// Put up info server.
int port = this.conf.getInt(HConstants.MASTER_INFO_PORT, 60010);
if (port >= 0) {
String a = this.conf.get("hbase.master.info.bindAddress", "0.0.0.0");
this.infoServer = new InfoServer(MASTER, a, port, false, this.conf);
this.infoServer.addServlet("status", "/master-status", MasterStatusServlet.class);
this.infoServer.addServlet("dump", "/dump", MasterDumpServlet.class);
this.infoServer.setAttribute(MASTER, this);
this.infoServer.start();
}
// Start allowing requests to happen.
this.rpcServer.openServer();
this.rpcServerOpen = true;
if (LOG.isDebugEnabled()) {
LOG.debug("Started service threads");
}
}
/**
* Use this when trying to figure when its ok to send in rpcs. Used by tests.
* @return True if we have successfully run {@link HBaseServer#openServer()}
*/
boolean isRpcServerOpen() {
return this.rpcServerOpen;
}
private void stopServiceThreads() {
if (LOG.isDebugEnabled()) {
LOG.debug("Stopping service threads");
}
if (this.rpcServer != null) this.rpcServer.stop();
this.rpcServerOpen = false;
// Clean up and close up shop
if (this.logCleaner!= null) this.logCleaner.interrupt();
if (this.hfileCleaner != null) this.hfileCleaner.interrupt();
if (this.infoServer != null) {
LOG.info("Stopping infoServer");
try {
this.infoServer.stop();
} catch (Exception ex) {
ex.printStackTrace();
}
}
if (this.executorService != null) this.executorService.shutdown();
}
private static Thread getAndStartClusterStatusChore(HMaster master) {
if (master == null || master.balancer == null) {
return null;
}
Chore chore = new ClusterStatusChore(master, master.balancer);
return Threads.setDaemonThreadRunning(chore.getThread());
}
private static Thread getAndStartBalancerChore(final HMaster master) {
// Start up the load balancer chore
Chore chore = new BalancerChore(master);
return Threads.setDaemonThreadRunning(chore.getThread());
}
private void stopChores() {
if (this.balancerChore != null) {
this.balancerChore.interrupt();
}
if (this.clusterStatusChore != null) {
this.clusterStatusChore.interrupt();
}
if (this.catalogJanitorChore != null) {
this.catalogJanitorChore.interrupt();
}
}
@Override
public RegionServerStartupResponse regionServerStartup(
RpcController controller, RegionServerStartupRequest request) throws ServiceException {
// Register with server manager
try {
InetAddress ia = getRemoteInetAddress(request.getPort(), request.getServerStartCode());
ServerName rs = this.serverManager.regionServerStartup(ia, request.getPort(),
request.getServerStartCode(), request.getServerCurrentTime());
// Send back some config info
RegionServerStartupResponse.Builder resp = createConfigurationSubset();
NameStringPair.Builder entry = NameStringPair.newBuilder()
.setName(HConstants.KEY_FOR_HOSTNAME_SEEN_BY_MASTER)
.setValue(rs.getHostname());
resp.addMapEntries(entry.build());
return resp.build();
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
}
/**
* @return Get remote side's InetAddress
* @throws UnknownHostException
*/
InetAddress getRemoteInetAddress(final int port, final long serverStartCode)
throws UnknownHostException {
// Do it out here in its own little method so can fake an address when
// mocking up in tests.
return HBaseServer.getRemoteIp();
}
/**
* @return Subset of configuration to pass initializing regionservers: e.g.
* the filesystem to use and root directory to use.
*/
protected RegionServerStartupResponse.Builder createConfigurationSubset() {
RegionServerStartupResponse.Builder resp = addConfig(
RegionServerStartupResponse.newBuilder(), HConstants.HBASE_DIR);
return addConfig(resp, "fs.default.name");
}
private RegionServerStartupResponse.Builder addConfig(
final RegionServerStartupResponse.Builder resp, final String key) {
NameStringPair.Builder entry = NameStringPair.newBuilder()
.setName(key)
.setValue(this.conf.get(key));
resp.addMapEntries(entry.build());
return resp;
}
@Override
public GetLastFlushedSequenceIdResponse getLastFlushedSequenceId(RpcController controller,
GetLastFlushedSequenceIdRequest request) throws ServiceException {
byte[] regionName = request.getRegionName().toByteArray();
long seqId = serverManager.getLastFlushedSequenceId(regionName);
return ResponseConverter.buildGetLastFlushedSequenceIdResponse(seqId);
}
@Override
public RegionServerReportResponse regionServerReport(
RpcController controller, RegionServerReportRequest request) throws ServiceException {
try {
HBaseProtos.ServerLoad sl = request.getLoad();
this.serverManager.regionServerReport(ProtobufUtil.toServerName(request.getServer()), new ServerLoad(sl));
if (sl != null && this.metricsMaster != null) {
// Up our metrics.
this.metricsMaster.incrementRequests(sl.getTotalNumberOfRequests());
}
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
return RegionServerReportResponse.newBuilder().build();
}
@Override
public ReportRSFatalErrorResponse reportRSFatalError(
RpcController controller, ReportRSFatalErrorRequest request) throws ServiceException {
String errorText = request.getErrorMessage();
ServerName sn = ProtobufUtil.toServerName(request.getServer());
String msg = "Region server " + Bytes.toString(sn.getVersionedBytes()) +
" reported a fatal error:\n" + errorText;
LOG.error(msg);
rsFatals.add(msg);
return ReportRSFatalErrorResponse.newBuilder().build();
}
public boolean isMasterRunning() {
return !isStopped();
}
public IsMasterRunningResponse isMasterRunning(RpcController c, IsMasterRunningRequest req)
throws ServiceException {
return IsMasterRunningResponse.newBuilder().setIsMasterRunning(isMasterRunning()).build();
}
@Override
public CatalogScanResponse runCatalogScan(RpcController c,
CatalogScanRequest req) throws ServiceException {
try {
return ResponseConverter.buildCatalogScanResponse(catalogJanitorChore.scan());
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
}
@Override
public EnableCatalogJanitorResponse enableCatalogJanitor(RpcController c,
EnableCatalogJanitorRequest req) throws ServiceException {
return EnableCatalogJanitorResponse.newBuilder().
setPrevValue(catalogJanitorChore.setEnabled(req.getEnable())).build();
}
@Override
public IsCatalogJanitorEnabledResponse isCatalogJanitorEnabled(RpcController c,
IsCatalogJanitorEnabledRequest req) throws ServiceException {
boolean isEnabled = catalogJanitorChore != null ? catalogJanitorChore.getEnabled() : false;
return IsCatalogJanitorEnabledResponse.newBuilder().setValue(isEnabled).build();
}
/**
* @return Maximum time we should run balancer for
*/
private int getBalancerCutoffTime() {
int balancerCutoffTime =
getConfiguration().getInt("hbase.balancer.max.balancing", -1);
if (balancerCutoffTime == -1) {
// No time period set so create one -- do half of balancer period.
int balancerPeriod =
getConfiguration().getInt("hbase.balancer.period", 300000);
balancerCutoffTime = balancerPeriod / 2;
// If nonsense period, set it to balancerPeriod
if (balancerCutoffTime <= 0) balancerCutoffTime = balancerPeriod;
}
return balancerCutoffTime;
}
public boolean balance() throws IOException {
// if master not initialized, don't run balancer.
if (!this.initialized) {
LOG.debug("Master has not been initialized, don't run balancer.");
return false;
}
// If balance not true, don't run balancer.
if (!this.loadBalancerTracker.isBalancerOn()) return false;
// Do this call outside of synchronized block.
int maximumBalanceTime = getBalancerCutoffTime();
long cutoffTime = System.currentTimeMillis() + maximumBalanceTime;
boolean balancerRan;
synchronized (this.balancer) {
// Only allow one balance run at at time.
if (this.assignmentManager.getRegionStates().isRegionsInTransition()) {
Map<String, RegionState> regionsInTransition =
this.assignmentManager.getRegionStates().getRegionsInTransition();
LOG.debug("Not running balancer because " + regionsInTransition.size() +
" region(s) in transition: " + org.apache.commons.lang.StringUtils.
abbreviate(regionsInTransition.toString(), 256));
return false;
}
if (this.serverManager.areDeadServersInProgress()) {
LOG.debug("Not running balancer because processing dead regionserver(s): " +
this.serverManager.getDeadServers());
return false;
}
if (this.cpHost != null) {
if (this.cpHost.preBalance()) {
LOG.debug("Coprocessor bypassing balancer request");
return false;
}
}
Map<String, Map<ServerName, List<HRegionInfo>>> assignmentsByTable =
this.assignmentManager.getRegionStates().getAssignmentsByTable();
List<RegionPlan> plans = new ArrayList<RegionPlan>();
//Give the balancer the current cluster state.
this.balancer.setClusterStatus(getClusterStatus());
for (Map<ServerName, List<HRegionInfo>> assignments : assignmentsByTable.values()) {
List<RegionPlan> partialPlans = this.balancer.balanceCluster(assignments);
if (partialPlans != null) plans.addAll(partialPlans);
}
int rpCount = 0; // number of RegionPlans balanced so far
long totalRegPlanExecTime = 0;
balancerRan = plans != null;
if (plans != null && !plans.isEmpty()) {
for (RegionPlan plan: plans) {
LOG.info("balance " + plan);
long balStartTime = System.currentTimeMillis();
this.assignmentManager.balance(plan);
totalRegPlanExecTime += System.currentTimeMillis()-balStartTime;
rpCount++;
if (rpCount < plans.size() &&
// if performing next balance exceeds cutoff time, exit the loop
(System.currentTimeMillis() + (totalRegPlanExecTime / rpCount)) > cutoffTime) {
LOG.debug("No more balancing till next balance run; maximumBalanceTime=" +
maximumBalanceTime);
break;
}
}
}
if (this.cpHost != null) {
this.cpHost.postBalance();
}
}
return balancerRan;
}
@Override
public BalanceResponse balance(RpcController c, BalanceRequest request) throws ServiceException {
try {
return BalanceResponse.newBuilder().setBalancerRan(balance()).build();
} catch (IOException e) {
throw new ServiceException(e);
}
}
enum BalanceSwitchMode {
SYNC,
ASYNC
}
/**
* Assigns balancer switch according to BalanceSwitchMode
* @param b new balancer switch
* @param mode BalanceSwitchMode
* @return old balancer switch
*/
public boolean switchBalancer(final boolean b, BalanceSwitchMode mode) throws IOException {
boolean oldValue = this.loadBalancerTracker.isBalancerOn();
boolean newValue = b;
try {
if (this.cpHost != null) {
newValue = this.cpHost.preBalanceSwitch(newValue);
}
try {
if (mode == BalanceSwitchMode.SYNC) {
synchronized (this.balancer) {
this.loadBalancerTracker.setBalancerOn(newValue);
}
} else {
this.loadBalancerTracker.setBalancerOn(newValue);
}
} catch (KeeperException ke) {
throw new IOException(ke);
}
LOG.info("BalanceSwitch=" + newValue);
if (this.cpHost != null) {
this.cpHost.postBalanceSwitch(oldValue, newValue);
}
} catch (IOException ioe) {
LOG.warn("Error flipping balance switch", ioe);
}
return oldValue;
}
public boolean synchronousBalanceSwitch(final boolean b) throws IOException {
return switchBalancer(b, BalanceSwitchMode.SYNC);
}
public boolean balanceSwitch(final boolean b) throws IOException {
return switchBalancer(b, BalanceSwitchMode.ASYNC);
}
@Override
public SetBalancerRunningResponse setBalancerRunning(
RpcController controller, SetBalancerRunningRequest req) throws ServiceException {
try {
boolean prevValue = (req.getSynchronous())?
synchronousBalanceSwitch(req.getOn()):balanceSwitch(req.getOn());
return SetBalancerRunningResponse.newBuilder().setPrevBalanceValue(prevValue).build();
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
}
/**
* Switch for the background CatalogJanitor thread.
* Used for testing. The thread will continue to run. It will just be a noop
* if disabled.
* @param b If false, the catalog janitor won't do anything.
*/
public void setCatalogJanitorEnabled(final boolean b) {
((CatalogJanitor)this.catalogJanitorChore).setEnabled(b);
}
@Override
public MoveRegionResponse moveRegion(RpcController controller, MoveRegionRequest req)
throws ServiceException {
final byte [] encodedRegionName = req.getRegion().getValue().toByteArray();
RegionSpecifierType type = req.getRegion().getType();
final byte [] destServerName = (req.hasDestServerName())?
Bytes.toBytes(ProtobufUtil.toServerName(req.getDestServerName()).getServerName()):null;
MoveRegionResponse mrr = MoveRegionResponse.newBuilder().build();
if (type != RegionSpecifierType.ENCODED_REGION_NAME) {
LOG.warn("moveRegion specifier type: expected: " + RegionSpecifierType.ENCODED_REGION_NAME
+ " actual: " + type);
}
RegionState regionState = assignmentManager.getRegionStates().
getRegionState(Bytes.toString(encodedRegionName));
if (regionState == null) {
throw new ServiceException(
new UnknownRegionException(Bytes.toStringBinary(encodedRegionName)));
}
HRegionInfo hri = regionState.getRegion();
ServerName dest;
if (destServerName == null || destServerName.length == 0) {
LOG.info("Passed destination servername is null/empty so " +
"choosing a server at random");
final List<ServerName> destServers = this.serverManager.createDestinationServersList(
regionState.getServerName());
dest = balancer.randomAssignment(hri, destServers);
} else {
dest = new ServerName(Bytes.toString(destServerName));
if (dest.equals(regionState.getServerName())) {
LOG.debug("Skipping move of region " + hri.getRegionNameAsString()
+ " because region already assigned to the same server " + dest + ".");
return mrr;
}
}
// Now we can do the move
RegionPlan rp = new RegionPlan(hri, regionState.getServerName(), dest);
try {
if (this.cpHost != null) {
if (this.cpHost.preMove(hri, rp.getSource(), rp.getDestination())) {
return mrr;
}
}
LOG.info("Added move plan " + rp + ", running balancer");
this.assignmentManager.balance(rp);
if (this.cpHost != null) {
this.cpHost.postMove(hri, rp.getSource(), rp.getDestination());
}
} catch (IOException ioe) {
UnknownRegionException ure = new UnknownRegionException(
Bytes.toStringBinary(encodedRegionName));
ure.initCause(ioe);
throw new ServiceException(ure);
}
return mrr;
}
@Override
public void createTable(HTableDescriptor hTableDescriptor,
byte [][] splitKeys)
throws IOException {
if (!isMasterRunning()) {
throw new MasterNotRunningException();
}
HRegionInfo [] newRegions = getHRegionInfos(hTableDescriptor, splitKeys);
checkInitialized();
checkCompression(hTableDescriptor);
if (cpHost != null) {
cpHost.preCreateTable(hTableDescriptor, newRegions);
}
this.executorService.submit(new CreateTableHandler(this,
this.fileSystemManager, hTableDescriptor, conf,
newRegions, catalogTracker, assignmentManager));
if (cpHost != null) {
cpHost.postCreateTable(hTableDescriptor, newRegions);
}
}
private void checkCompression(final HTableDescriptor htd)
throws IOException {
if (!this.masterCheckCompression) return;
for (HColumnDescriptor hcd : htd.getColumnFamilies()) {
checkCompression(hcd);
}
}
private void checkCompression(final HColumnDescriptor hcd)
throws IOException {
if (!this.masterCheckCompression) return;
CompressionTest.testCompression(hcd.getCompression());
CompressionTest.testCompression(hcd.getCompactionCompression());
}
@Override
public CreateTableResponse createTable(RpcController controller, CreateTableRequest req)
throws ServiceException {
HTableDescriptor hTableDescriptor = HTableDescriptor.convert(req.getTableSchema());
byte [][] splitKeys = ProtobufUtil.getSplitKeysArray(req);
try {
createTable(hTableDescriptor,splitKeys);
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
return CreateTableResponse.newBuilder().build();
}
private HRegionInfo[] getHRegionInfos(HTableDescriptor hTableDescriptor,
byte[][] splitKeys) {
HRegionInfo[] hRegionInfos = null;
if (splitKeys == null || splitKeys.length == 0) {
hRegionInfos = new HRegionInfo[]{
new HRegionInfo(hTableDescriptor.getName(), null, null)};
} else {
int numRegions = splitKeys.length + 1;
hRegionInfos = new HRegionInfo[numRegions];
byte[] startKey = null;
byte[] endKey = null;
for (int i = 0; i < numRegions; i++) {
endKey = (i == splitKeys.length) ? null : splitKeys[i];
hRegionInfos[i] =
new HRegionInfo(hTableDescriptor.getName(), startKey, endKey);
startKey = endKey;
}
}
return hRegionInfos;
}
private static boolean isCatalogTable(final byte [] tableName) {
return Bytes.equals(tableName, HConstants.ROOT_TABLE_NAME) ||
Bytes.equals(tableName, HConstants.META_TABLE_NAME);
}
@Override
public DeleteTableResponse deleteTable(RpcController controller, DeleteTableRequest request)
throws ServiceException {
byte [] tableName = request.getTableName().toByteArray();
try {
checkInitialized();
if (cpHost != null) {
cpHost.preDeleteTable(tableName);
}
this.executorService.submit(new DeleteTableHandler(tableName, this, this));
if (cpHost != null) {
cpHost.postDeleteTable(tableName);
}
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
return DeleteTableResponse.newBuilder().build();
}
/**
* Get the number of regions of the table that have been updated by the alter.
*
* @return Pair indicating the number of regions updated Pair.getFirst is the
* regions that are yet to be updated Pair.getSecond is the total number
* of regions of the table
* @throws IOException
*/
@Override
public GetSchemaAlterStatusResponse getSchemaAlterStatus(
RpcController controller, GetSchemaAlterStatusRequest req) throws ServiceException {
// TODO: currently, we query using the table name on the client side. this
// may overlap with other table operations or the table operation may
// have completed before querying this API. We need to refactor to a
// transaction system in the future to avoid these ambiguities.
byte [] tableName = req.getTableName().toByteArray();
try {
Pair<Integer,Integer> pair = this.assignmentManager.getReopenStatus(tableName);
GetSchemaAlterStatusResponse.Builder ret = GetSchemaAlterStatusResponse.newBuilder();
ret.setYetToUpdateRegions(pair.getFirst());
ret.setTotalRegions(pair.getSecond());
return ret.build();
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
}
public AddColumnResponse addColumn(RpcController controller, AddColumnRequest req)
throws ServiceException {
byte [] tableName = req.getTableName().toByteArray();
HColumnDescriptor column = HColumnDescriptor.convert(req.getColumnFamilies());
try {
checkInitialized();
if (cpHost != null) {
if (cpHost.preAddColumn(tableName, column)) {
return AddColumnResponse.newBuilder().build();
}
}
new TableAddFamilyHandler(tableName, column, this, this).process();
if (cpHost != null) {
cpHost.postAddColumn(tableName, column);
}
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
return AddColumnResponse.newBuilder().build();
}
public ModifyColumnResponse modifyColumn(RpcController controller, ModifyColumnRequest req)
throws ServiceException {
byte [] tableName = req.getTableName().toByteArray();
HColumnDescriptor descriptor = HColumnDescriptor.convert(req.getColumnFamilies());
try {
checkInitialized();
checkCompression(descriptor);
if (cpHost != null) {
if (cpHost.preModifyColumn(tableName, descriptor)) {
return ModifyColumnResponse.newBuilder().build();
}
}
new TableModifyFamilyHandler(tableName, descriptor, this, this).process();
if (cpHost != null) {
cpHost.postModifyColumn(tableName, descriptor);
}
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
return ModifyColumnResponse.newBuilder().build();
}
@Override
public DeleteColumnResponse deleteColumn(RpcController controller, DeleteColumnRequest req)
throws ServiceException {
final byte [] tableName = req.getTableName().toByteArray();
final byte [] columnName = req.getColumnName().toByteArray();
try {
checkInitialized();
if (cpHost != null) {
if (cpHost.preDeleteColumn(tableName, columnName)) {
return DeleteColumnResponse.newBuilder().build();
}
}
new TableDeleteFamilyHandler(tableName, columnName, this, this).process();
if (cpHost != null) {
cpHost.postDeleteColumn(tableName, columnName);
}
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
return DeleteColumnResponse.newBuilder().build();
}
@Override
public EnableTableResponse enableTable(RpcController controller, EnableTableRequest request)
throws ServiceException {
byte [] tableName = request.getTableName().toByteArray();
try {
checkInitialized();
if (cpHost != null) {
cpHost.preEnableTable(tableName);
}
this.executorService.submit(new EnableTableHandler(this, tableName,
catalogTracker, assignmentManager, false));
if (cpHost != null) {
cpHost.postEnableTable(tableName);
}
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
return EnableTableResponse.newBuilder().build();
}
@Override
public DisableTableResponse disableTable(RpcController controller, DisableTableRequest request)
throws ServiceException {
byte [] tableName = request.getTableName().toByteArray();
try {
checkInitialized();
if (cpHost != null) {
cpHost.preDisableTable(tableName);
}
this.executorService.submit(new DisableTableHandler(this, tableName,
catalogTracker, assignmentManager, false));
if (cpHost != null) {
cpHost.postDisableTable(tableName);
}
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
return DisableTableResponse.newBuilder().build();
}
/**
* Return the region and current deployment for the region containing
* the given row. If the region cannot be found, returns null. If it
* is found, but not currently deployed, the second element of the pair
* may be null.
*/
Pair<HRegionInfo, ServerName> getTableRegionForRow(
final byte [] tableName, final byte [] rowKey)
throws IOException {
final AtomicReference<Pair<HRegionInfo, ServerName>> result =
new AtomicReference<Pair<HRegionInfo, ServerName>>(null);
MetaScannerVisitor visitor =
new MetaScannerVisitorBase() {
@Override
public boolean processRow(Result data) throws IOException {
if (data == null || data.size() <= 0) {
return true;
}
Pair<HRegionInfo, ServerName> pair = HRegionInfo.getHRegionInfoAndServerName(data);
if (pair == null) {
return false;
}
if (!Bytes.equals(pair.getFirst().getTableName(), tableName)) {
return false;
}
result.set(pair);
return true;
}
};
MetaScanner.metaScan(conf, visitor, tableName, rowKey, 1);
return result.get();
}
@Override
public ModifyTableResponse modifyTable(RpcController controller, ModifyTableRequest req)
throws ServiceException {
final byte [] tableName = req.getTableName().toByteArray();
HTableDescriptor htd = HTableDescriptor.convert(req.getTableSchema());
try {
checkInitialized();
checkCompression(htd);
if (cpHost != null) {
cpHost.preModifyTable(tableName, htd);
}
TableEventHandler tblHandle = new ModifyTableHandler(tableName, htd, this, this);
this.executorService.submit(tblHandle);
tblHandle.waitForPersist();
if (cpHost != null) {
cpHost.postModifyTable(tableName, htd);
}
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
return ModifyTableResponse.newBuilder().build();
}
@Override
public void checkTableModifiable(final byte [] tableName)
throws IOException {
String tableNameStr = Bytes.toString(tableName);
if (isCatalogTable(tableName)) {
throw new IOException("Can't modify catalog tables");
}
if (!MetaReader.tableExists(getCatalogTracker(), tableNameStr)) {
throw new TableNotFoundException(tableNameStr);
}
if (!getAssignmentManager().getZKTable().
isDisabledTable(Bytes.toString(tableName))) {
throw new TableNotDisabledException(tableName);
}
}
@Override
public GetClusterStatusResponse getClusterStatus(RpcController controller,
GetClusterStatusRequest req)
throws ServiceException {
GetClusterStatusResponse.Builder response = GetClusterStatusResponse.newBuilder();
response.setClusterStatus(getClusterStatus().convert());
return response.build();
}
/**
* @return cluster status
*/
public ClusterStatus getClusterStatus() {
// Build Set of backup masters from ZK nodes
List<String> backupMasterStrings;
try {
backupMasterStrings = ZKUtil.listChildrenNoWatch(this.zooKeeper,
this.zooKeeper.backupMasterAddressesZNode);
} catch (KeeperException e) {
LOG.warn(this.zooKeeper.prefix("Unable to list backup servers"), e);
backupMasterStrings = new ArrayList<String>(0);
}
List<ServerName> backupMasters = new ArrayList<ServerName>(
backupMasterStrings.size());
for (String s: backupMasterStrings) {
try {
byte [] bytes =
ZKUtil.getData(this.zooKeeper, ZKUtil.joinZNode(
this.zooKeeper.backupMasterAddressesZNode, s));
if (bytes != null) {
ServerName sn;
try {
sn = ServerName.parseFrom(bytes);
} catch (DeserializationException e) {
LOG.warn("Failed parse, skipping registering backup server", e);
continue;
}
backupMasters.add(sn);
}
} catch (KeeperException e) {
LOG.warn(this.zooKeeper.prefix("Unable to get information about " +
"backup servers"), e);
}
}
Collections.sort(backupMasters, new Comparator<ServerName>() {
public int compare(ServerName s1, ServerName s2) {
return s1.getServerName().compareTo(s2.getServerName());
}});
return new ClusterStatus(VersionInfo.getVersion(),
this.fileSystemManager.getClusterId().toString(),
this.serverManager.getOnlineServers(),
this.serverManager.getDeadServers(),
this.serverName,
backupMasters,
this.assignmentManager.getRegionStates().getRegionsInTransition(),
this.getCoprocessors(), this.loadBalancerTracker.isBalancerOn());
}
public String getClusterId() {
if (fileSystemManager == null) {
return "";
}
ClusterId id = fileSystemManager.getClusterId();
if (id == null) {
return "";
}
return id.toString();
}
/**
* The set of loaded coprocessors is stored in a static set. Since it's
* statically allocated, it does not require that HMaster's cpHost be
* initialized prior to accessing it.
* @return a String representation of the set of names of the loaded
* coprocessors.
*/
public static String getLoadedCoprocessors() {
return CoprocessorHost.getLoadedCoprocessors().toString();
}
/**
* @return timestamp in millis when HMaster was started.
*/
public long getMasterStartTime() {
return masterStartTime;
}
/**
* @return timestamp in millis when HMaster became the active master.
*/
public long getMasterActiveTime() {
return masterActiveTime;
}
/**
* @return array of coprocessor SimpleNames.
*/
public String[] getCoprocessors() {
Set<String> masterCoprocessors =
getCoprocessorHost().getCoprocessors();
return masterCoprocessors.toArray(new String[0]);
}
@Override
public void abort(final String msg, final Throwable t) {
if (cpHost != null) {
// HBASE-4014: dump a list of loaded coprocessors.
LOG.fatal("Master server abort: loaded coprocessors are: " +
getLoadedCoprocessors());
}
if (abortNow(msg, t)) {
if (t != null) LOG.fatal(msg, t);
else LOG.fatal(msg);
this.abort = true;
stop("Aborting");
}
}
/**
* We do the following in a different thread. If it is not completed
* in time, we will time it out and assume it is not easy to recover.
*
* 1. Create a new ZK session. (since our current one is expired)
* 2. Try to become a primary master again
* 3. Initialize all ZK based system trackers.
* 4. Assign root and meta. (they are already assigned, but we need to update our
* internal memory state to reflect it)
* 5. Process any RIT if any during the process of our recovery.
*
* @return True if we could successfully recover from ZK session expiry.
* @throws InterruptedException
* @throws IOException
* @throws KeeperException
* @throws ExecutionException
*/
private boolean tryRecoveringExpiredZKSession() throws InterruptedException,
IOException, KeeperException, ExecutionException {
this.zooKeeper.reconnectAfterExpiration();
Callable<Boolean> callable = new Callable<Boolean> () {
public Boolean call() throws InterruptedException,
IOException, KeeperException {
MonitoredTask status =
TaskMonitor.get().createStatus("Recovering expired ZK session");
try {
if (!becomeActiveMaster(status)) {
return Boolean.FALSE;
}
serverShutdownHandlerEnabled = false;
initialized = false;
finishInitialization(status, true);
return Boolean.TRUE;
} finally {
status.cleanup();
}
}
};
long timeout =
conf.getLong("hbase.master.zksession.recover.timeout", 300000);
java.util.concurrent.ExecutorService executor =
Executors.newSingleThreadExecutor();
Future<Boolean> result = executor.submit(callable);
executor.shutdown();
if (executor.awaitTermination(timeout, TimeUnit.MILLISECONDS)
&& result.isDone()) {
Boolean recovered = result.get();
if (recovered != null) {
return recovered.booleanValue();
}
}
executor.shutdownNow();
return false;
}
/**
* Check to see if the current trigger for abort is due to ZooKeeper session
* expiry, and If yes, whether we can recover from ZK session expiry.
*
* @param msg Original abort message
* @param t The cause for current abort request
* @return true if we should proceed with abort operation, false other wise.
*/
private boolean abortNow(final String msg, final Throwable t) {
if (!this.isActiveMaster) {
return true;
}
if (t != null && t instanceof KeeperException.SessionExpiredException) {
try {
LOG.info("Primary Master trying to recover from ZooKeeper session " +
"expiry.");
return !tryRecoveringExpiredZKSession();
} catch (Throwable newT) {
LOG.error("Primary master encountered unexpected exception while " +
"trying to recover from ZooKeeper session" +
" expiry. Proceeding with server abort.", newT);
}
}
return true;
}
@Override
public ZooKeeperWatcher getZooKeeper() {
return zooKeeper;
}
public MasterCoprocessorHost getCoprocessorHost() {
return cpHost;
}
@Override
public ServerName getServerName() {
return this.serverName;
}
@Override
public CatalogTracker getCatalogTracker() {
return catalogTracker;
}
@Override
public AssignmentManager getAssignmentManager() {
return this.assignmentManager;
}
public MemoryBoundedLogMessageBuffer getRegionServerFatalLogBuffer() {
return rsFatals;
}
public void shutdown() throws IOException {
spanReceiverHost.closeReceivers();
if (cpHost != null) {
cpHost.preShutdown();
}
if (mxBean != null) {
MBeanUtil.unregisterMBean(mxBean);
mxBean = null;
}
if (this.assignmentManager != null) this.assignmentManager.shutdown();
if (this.serverManager != null) this.serverManager.shutdownCluster();
try {
if (this.clusterStatusTracker != null){
this.clusterStatusTracker.setClusterDown();
}
} catch (KeeperException e) {
LOG.error("ZooKeeper exception trying to set cluster as down in ZK", e);
}
}
@Override
public ShutdownResponse shutdown(RpcController controller, ShutdownRequest request)
throws ServiceException {
try {
shutdown();
} catch (IOException e) {
throw new ServiceException(e);
}
return ShutdownResponse.newBuilder().build();
}
public void stopMaster() throws IOException {
if (cpHost != null) {
cpHost.preStopMaster();
}
stop("Stopped by " + Thread.currentThread().getName());
}
@Override
public StopMasterResponse stopMaster(RpcController controller, StopMasterRequest request)
throws ServiceException {
try {
stopMaster();
} catch (IOException e) {
throw new ServiceException(e);
}
return StopMasterResponse.newBuilder().build();
}
@Override
public void stop(final String why) {
LOG.info(why);
this.stopped = true;
// We wake up the stopSleeper to stop immediately
stopSleeper.skipSleepCycle();
// If we are a backup master, we need to interrupt wait
if (this.activeMasterManager != null) {
synchronized (this.activeMasterManager.clusterHasActiveMaster) {
this.activeMasterManager.clusterHasActiveMaster.notifyAll();
}
}
}
@Override
public boolean isStopped() {
return this.stopped;
}
public boolean isAborted() {
return this.abort;
}
void checkInitialized() throws PleaseHoldException {
if (!this.initialized) {
throw new PleaseHoldException("Master is initializing");
}
}
/**
* Report whether this master is currently the active master or not.
* If not active master, we are parked on ZK waiting to become active.
*
* This method is used for testing.
*
* @return true if active master, false if not.
*/
public boolean isActiveMaster() {
return isActiveMaster;
}
/**
* Report whether this master has completed with its initialization and is
* ready. If ready, the master is also the active master. A standby master
* is never ready.
*
* This method is used for testing.
*
* @return true if master is ready to go, false if not.
*/
public boolean isInitialized() {
return initialized;
}
/**
* ServerShutdownHandlerEnabled is set false before completing
* assignRootAndMeta to prevent processing of ServerShutdownHandler.
* @return true if assignRootAndMeta has completed;
*/
public boolean isServerShutdownHandlerEnabled() {
return this.serverShutdownHandlerEnabled;
}
@Override
public AssignRegionResponse assignRegion(RpcController controller, AssignRegionRequest req)
throws ServiceException {
try {
final byte [] regionName = req.getRegion().getValue().toByteArray();
RegionSpecifierType type = req.getRegion().getType();
AssignRegionResponse arr = AssignRegionResponse.newBuilder().build();
checkInitialized();
if (type != RegionSpecifierType.REGION_NAME) {
LOG.warn("assignRegion specifier type: expected: " + RegionSpecifierType.REGION_NAME
+ " actual: " + type);
}
HRegionInfo regionInfo = assignmentManager.getRegionStates().getRegionInfo(regionName);
if (regionInfo == null) throw new UnknownRegionException(Bytes.toString(regionName));
if (cpHost != null) {
if (cpHost.preAssign(regionInfo)) {
return arr;
}
}
assignmentManager.assign(regionInfo, true, true);
if (cpHost != null) {
cpHost.postAssign(regionInfo);
}
return arr;
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
}
public void assignRegion(HRegionInfo hri) {
assignmentManager.assign(hri, true);
}
@Override
public UnassignRegionResponse unassignRegion(RpcController controller, UnassignRegionRequest req)
throws ServiceException {
try {
final byte [] regionName = req.getRegion().getValue().toByteArray();
RegionSpecifierType type = req.getRegion().getType();
final boolean force = req.getForce();
UnassignRegionResponse urr = UnassignRegionResponse.newBuilder().build();
checkInitialized();
if (type != RegionSpecifierType.REGION_NAME) {
LOG.warn("unassignRegion specifier type: expected: " + RegionSpecifierType.REGION_NAME
+ " actual: " + type);
}
Pair<HRegionInfo, ServerName> pair =
MetaReader.getRegion(this.catalogTracker, regionName);
if (pair == null) throw new UnknownRegionException(Bytes.toString(regionName));
HRegionInfo hri = pair.getFirst();
if (cpHost != null) {
if (cpHost.preUnassign(hri, force)) {
return urr;
}
}
if (force) {
this.assignmentManager.regionOffline(hri);
assignRegion(hri);
} else {
this.assignmentManager.unassign(hri, force);
}
if (cpHost != null) {
cpHost.postUnassign(hri, force);
}
return urr;
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
}
/**
* Get list of TableDescriptors for requested tables.
* @param controller Unused (set to null).
* @param req GetTableDescriptorsRequest that contains:
* - tableNames: requested tables, or if empty, all are requested
* @return GetTableDescriptorsResponse
* @throws ServiceException
*/
public GetTableDescriptorsResponse getTableDescriptors(
RpcController controller, GetTableDescriptorsRequest req) throws ServiceException {
GetTableDescriptorsResponse.Builder builder = GetTableDescriptorsResponse.newBuilder();
if (req.getTableNamesCount() == 0) {
// request for all TableDescriptors
Map<String, HTableDescriptor> descriptors = null;
try {
descriptors = this.tableDescriptors.getAll();
} catch (IOException e) {
LOG.warn("Failed getting all descriptors", e);
}
if (descriptors != null) {
for (HTableDescriptor htd : descriptors.values()) {
builder.addTableSchema(htd.convert());
}
}
}
else {
for (String s: req.getTableNamesList()) {
HTableDescriptor htd = null;
try {
htd = this.tableDescriptors.get(s);
} catch (IOException e) {
LOG.warn("Failed getting descriptor for " + s, e);
}
if (htd == null) continue;
builder.addTableSchema(htd.convert());
}
}
return builder.build();
}
/**
* Compute the average load across all region servers.
* Currently, this uses a very naive computation - just uses the number of
* regions being served, ignoring stats about number of requests.
* @return the average load
*/
public double getAverageLoad() {
if (this.assignmentManager == null) {
return 0;
}
RegionStates regionStates = this.assignmentManager.getRegionStates();
if (regionStates == null) {
return 0;
}
return regionStates.getAverageLoad();
}
/**
* Special method, only used by hbck.
*/
@Override
public OfflineRegionResponse offlineRegion(RpcController controller, OfflineRegionRequest request)
throws ServiceException {
final byte [] regionName = request.getRegion().getValue().toByteArray();
RegionSpecifierType type = request.getRegion().getType();
if (type != RegionSpecifierType.REGION_NAME) {
LOG.warn("moveRegion specifier type: expected: " + RegionSpecifierType.REGION_NAME
+ " actual: " + type);
}
try {
Pair<HRegionInfo, ServerName> pair =
MetaReader.getRegion(this.catalogTracker, regionName);
if (pair == null) throw new UnknownRegionException(Bytes.toStringBinary(regionName));
HRegionInfo hri = pair.getFirst();
this.assignmentManager.regionOffline(hri);
} catch (IOException ioe) {
throw new ServiceException(ioe);
}
return OfflineRegionResponse.newBuilder().build();
}
@Override
public boolean registerService(Service instance) {
/*
* No stacking of instances is allowed for a single service name
*/
Descriptors.ServiceDescriptor serviceDesc = instance.getDescriptorForType();
if (coprocessorServiceHandlers.containsKey(serviceDesc.getFullName())) {
LOG.error("Coprocessor service "+serviceDesc.getFullName()+
" already registered, rejecting request from "+instance
);
return false;
}
coprocessorServiceHandlers.put(serviceDesc.getFullName(), instance);
if (LOG.isDebugEnabled()) {
LOG.debug("Registered master coprocessor service: service="+serviceDesc.getFullName());
}
return true;
}
@Override
public ClientProtos.CoprocessorServiceResponse execMasterService(final RpcController controller,
final ClientProtos.CoprocessorServiceRequest request) throws ServiceException {
try {
ServerRpcController execController = new ServerRpcController();
ClientProtos.CoprocessorServiceCall call = request.getCall();
String serviceName = call.getServiceName();
String methodName = call.getMethodName();
if (!coprocessorServiceHandlers.containsKey(serviceName)) {
throw new HBaseRPC.UnknownProtocolException(null,
"No registered master coprocessor service found for name "+serviceName);
}
Service service = coprocessorServiceHandlers.get(serviceName);
Descriptors.ServiceDescriptor serviceDesc = service.getDescriptorForType();
Descriptors.MethodDescriptor methodDesc = serviceDesc.findMethodByName(methodName);
if (methodDesc == null) {
throw new HBaseRPC.UnknownProtocolException(service.getClass(),
"Unknown method "+methodName+" called on master service "+serviceName);
}
//invoke the method
Message execRequest = service.getRequestPrototype(methodDesc).newBuilderForType()
.mergeFrom(call.getRequest()).build();
final Message.Builder responseBuilder =
service.getResponsePrototype(methodDesc).newBuilderForType();
service.callMethod(methodDesc, controller, execRequest, new RpcCallback<Message>() {
@Override
public void run(Message message) {
if (message != null) {
responseBuilder.mergeFrom(message);
}
}
});
Message execResult = responseBuilder.build();
if (execController.getFailedOn() != null) {
throw execController.getFailedOn();
}
ClientProtos.CoprocessorServiceResponse.Builder builder =
ClientProtos.CoprocessorServiceResponse.newBuilder();
builder.setRegion(RequestConverter.buildRegionSpecifier(
RegionSpecifierType.REGION_NAME, HConstants.EMPTY_BYTE_ARRAY));
builder.setValue(
builder.getValueBuilder().setName(execResult.getClass().getName())
.setValue(execResult.toByteString()));
return builder.build();
} catch (IOException ie) {
throw new ServiceException(ie);
}
}
/**
* Utility for constructing an instance of the passed HMaster class.
* @param masterClass
* @param conf
* @return HMaster instance.
*/
public static HMaster constructMaster(Class<? extends HMaster> masterClass,
final Configuration conf) {
try {
Constructor<? extends HMaster> c =
masterClass.getConstructor(Configuration.class);
return c.newInstance(conf);
} catch (InvocationTargetException ite) {
Throwable target = ite.getTargetException() != null?
ite.getTargetException(): ite;
if (target.getCause() != null) target = target.getCause();
throw new RuntimeException("Failed construction of Master: " +
masterClass.toString(), target);
} catch (Exception e) {
throw new RuntimeException("Failed construction of Master: " +
masterClass.toString() + ((e.getCause() != null)?
e.getCause().getMessage(): ""), e);
}
}
/**
* @see org.apache.hadoop.hbase.master.HMasterCommandLine
*/
public static void main(String [] args) {
VersionInfo.logVersion();
new HMasterCommandLine(HMaster.class).doMain(args);
}
public HFileCleaner getHFileCleaner() {
return this.hfileCleaner;
}
}