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/**
*
* 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.io.InterruptedIOException;
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.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.ClusterStatus;
import org.apache.hadoop.hbase.CoordinatedStateException;
import org.apache.hadoop.hbase.CoordinatedStateManager;
import org.apache.hadoop.hbase.DoNotRetryIOException;
import org.apache.hadoop.hbase.HBaseIOException;
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.MasterNotRunningException;
import org.apache.hadoop.hbase.MetaMigrationConvertingToPB;
import org.apache.hadoop.hbase.MetaTableAccessor;
import org.apache.hadoop.hbase.NamespaceDescriptor;
import org.apache.hadoop.hbase.NamespaceNotFoundException;
import org.apache.hadoop.hbase.PleaseHoldException;
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.TableName;
import org.apache.hadoop.hbase.TableNotDisabledException;
import org.apache.hadoop.hbase.TableNotFoundException;
import org.apache.hadoop.hbase.UnknownRegionException;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
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.exceptions.DeserializationException;
import org.apache.hadoop.hbase.executor.ExecutorType;
import org.apache.hadoop.hbase.ipc.RequestContext;
import org.apache.hadoop.hbase.ipc.RpcServer;
import org.apache.hadoop.hbase.ipc.ServerNotRunningYetException;
import org.apache.hadoop.hbase.master.MasterRpcServices.BalanceSwitchMode;
import org.apache.hadoop.hbase.master.RegionState.State;
import org.apache.hadoop.hbase.master.balancer.BalancerChore;
import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer;
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.DispatchMergingRegionHandler;
import org.apache.hadoop.hbase.master.handler.EnableTableHandler;
import org.apache.hadoop.hbase.master.handler.ModifyTableHandler;
import org.apache.hadoop.hbase.master.handler.TableAddFamilyHandler;
import org.apache.hadoop.hbase.master.handler.TableDeleteFamilyHandler;
import org.apache.hadoop.hbase.master.handler.TableModifyFamilyHandler;
import org.apache.hadoop.hbase.master.handler.TruncateTableHandler;
import org.apache.hadoop.hbase.master.snapshot.SnapshotManager;
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.procedure.MasterProcedureManagerHost;
import org.apache.hadoop.hbase.procedure.flush.MasterFlushTableProcedureManager;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionServerInfo;
import org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos;
import org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SplitLogTask.RecoveryMode;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.hadoop.hbase.regionserver.RSRpcServices;
import org.apache.hadoop.hbase.regionserver.RegionSplitPolicy;
import org.apache.hadoop.hbase.replication.regionserver.Replication;
import org.apache.hadoop.hbase.security.UserProvider;
import org.apache.hadoop.hbase.util.Addressing;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.CompressionTest;
import org.apache.hadoop.hbase.util.ConfigUtil;
import org.apache.hadoop.hbase.util.FSUtils;
import org.apache.hadoop.hbase.util.HFileArchiveUtil;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.hbase.util.Threads;
import org.apache.hadoop.hbase.util.VersionInfo;
import org.apache.hadoop.hbase.zookeeper.DrainingServerTracker;
import org.apache.hadoop.hbase.zookeeper.LoadBalancerTracker;
import org.apache.hadoop.hbase.zookeeper.MasterAddressTracker;
import org.apache.hadoop.hbase.zookeeper.MetaTableLocator;
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.zookeeper.KeeperException;
import org.mortbay.jetty.Connector;
import org.mortbay.jetty.nio.SelectChannelConnector;
import org.mortbay.jetty.servlet.Context;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.protobuf.Descriptors;
import com.google.protobuf.Service;
/**
* 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.
*
* 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.
*
*
You can also shutdown just this master. Call {@link #stopMaster()}.
*
* @see org.apache.zookeeper.Watcher
*/
@InterfaceAudience.Private
@SuppressWarnings("deprecation")
public class HMaster extends HRegionServer implements 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";
// Manager and zk listener for master election
private ActiveMasterManager activeMasterManager;
// Region server tracker
RegionServerTracker regionServerTracker;
// Draining region server tracker
private DrainingServerTracker drainingServerTracker;
// Tracker for load balancer state
LoadBalancerTracker loadBalancerTracker;
/** Namespace stuff */
private TableNamespaceManager tableNamespaceManager;
// Metrics for the HMaster
final MetricsMaster metricsMaster;
// file system manager for the master FS operations
private MasterFileSystem fileSystemManager;
// server manager to deal with region server info
volatile ServerManager serverManager;
// manager of assignment nodes in zookeeper
AssignmentManager assignmentManager;
// buffer for "fatal error" notices from region servers
// in the cluster. This is only used for assisting
// operations/debugging.
MemoryBoundedLogMessageBuffer rsFatals;
// flag set after we become the active master (used for testing)
private volatile boolean isActiveMaster = false;
// flag set after we complete initialization once active,
// it is not private since it's used in unit tests
volatile boolean initialized = false;
// flag set after master services are started,
// initialization may have not completed yet.
volatile boolean serviceStarted = false;
// flag set after we complete assignMeta.
private volatile boolean serverShutdownHandlerEnabled = false;
LoadBalancer balancer;
private BalancerChore balancerChore;
private ClusterStatusChore clusterStatusChore;
private ClusterStatusPublisher clusterStatusPublisherChore = null;
CatalogJanitor catalogJanitorChore;
private LogCleaner logCleaner;
private HFileCleaner hfileCleaner;
MasterCoprocessorHost cpHost;
private final boolean preLoadTableDescriptors;
// Time stamps for when a hmaster became active
private long masterActiveTime;
//should we check the compression codec type at master side, default true, HBASE-6370
private final boolean masterCheckCompression;
Map coprocessorServiceHandlers = Maps.newHashMap();
// monitor for snapshot of hbase tables
SnapshotManager snapshotManager;
// monitor for distributed procedures
MasterProcedureManagerHost mpmHost;
/** flag used in test cases in order to simulate RS failures during master initialization */
private volatile boolean initializationBeforeMetaAssignment = false;
/** jetty server for master to redirect requests to regionserver infoServer */
private org.mortbay.jetty.Server masterJettyServer;
private int masterInfoPort;
public static class RedirectServlet extends HttpServlet {
private static final long serialVersionUID = 2894774810058302472L;
private static int regionServerInfoPort;
@Override
public void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String redirectUrl = request.getScheme() + "://"
+ request.getServerName() + ":" + regionServerInfoPort
+ request.getRequestURI();
response.sendRedirect(redirectUrl);
}
}
/**
* Initializes the HMaster. The steps are as follows:
*
*
* - Initialize the local HRegionServer
*
- Start the ActiveMasterManager.
*
*
* Remaining steps of initialization occur in
* #finishActiveMasterInitialization(MonitoredTask) after
* the master becomes the active one.
*
* @throws InterruptedException
* @throws KeeperException
* @throws IOException
*/
public HMaster(final Configuration conf, CoordinatedStateManager csm)
throws IOException, KeeperException, InterruptedException {
super(conf, csm);
this.rsFatals = new MemoryBoundedLogMessageBuffer(
conf.getLong("hbase.master.buffer.for.rs.fatals", 1*1024*1024));
LOG.info("hbase.rootdir=" + FSUtils.getRootDir(this.conf) +
", hbase.cluster.distributed=" + this.conf.getBoolean(HConstants.CLUSTER_DISTRIBUTED, false));
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("mapreduce.task.attempt.id") == null) {
this.conf.set("mapreduce.task.attempt.id", "hb_m_" + this.serverName.toString());
}
//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));
// preload table descriptor at startup
this.preLoadTableDescriptors = conf.getBoolean("hbase.master.preload.tabledescriptors", true);
// Do we publish the status?
boolean shouldPublish = conf.getBoolean(HConstants.STATUS_PUBLISHED,
HConstants.STATUS_PUBLISHED_DEFAULT);
Class publisherClass =
conf.getClass(ClusterStatusPublisher.STATUS_PUBLISHER_CLASS,
ClusterStatusPublisher.DEFAULT_STATUS_PUBLISHER_CLASS,
ClusterStatusPublisher.Publisher.class);
if (shouldPublish) {
if (publisherClass == null) {
LOG.warn(HConstants.STATUS_PUBLISHED + " is true, but " +
ClusterStatusPublisher.DEFAULT_STATUS_PUBLISHER_CLASS +
" is not set - not publishing status");
} else {
clusterStatusPublisherChore = new ClusterStatusPublisher(this, conf, publisherClass);
Threads.setDaemonThreadRunning(clusterStatusPublisherChore.getThread());
}
}
startActiveMasterManager();
putUpJettyServer();
}
private void putUpJettyServer() throws IOException {
if (!conf.getBoolean("hbase.master.infoserver.redirect", true)) {
return;
}
int infoPort = conf.getInt("hbase.master.info.port.orig",
HConstants.DEFAULT_MASTER_INFOPORT);
// -1 is for disabling info server, so no redirecting
if (infoPort < 0 || infoServer == null) {
return;
}
String addr = conf.get("hbase.master.info.bindAddress", "0.0.0.0");
if (!Addressing.isLocalAddress(InetAddress.getByName(addr))) {
String msg =
"Failed to start redirecting jetty server. Address " + addr
+ " does not belong to this host. Correct configuration parameter: "
+ "hbase.master.info.bindAddress";
LOG.error(msg);
throw new IOException(msg);
}
RedirectServlet.regionServerInfoPort = infoServer.getPort();
masterJettyServer = new org.mortbay.jetty.Server();
Connector connector = new SelectChannelConnector();
connector.setHost(addr);
connector.setPort(infoPort);
masterJettyServer.addConnector(connector);
masterJettyServer.setStopAtShutdown(true);
Context context = new Context(masterJettyServer, "/", Context.NO_SESSIONS);
context.addServlet(RedirectServlet.class, "/*");
try {
masterJettyServer.start();
} catch (Exception e) {
throw new IOException("Failed to start redirecting jetty server", e);
}
masterInfoPort = connector.getPort();
}
/**
* For compatibility, if failed with regionserver credentials, try the master one
*/
protected void login(UserProvider user, String host) throws IOException {
try {
super.login(user, host);
} catch (IOException ie) {
user.login("hbase.master.keytab.file",
"hbase.master.kerberos.principal", host);
}
}
/**
* If configured to put regions on active master,
* wait till a backup master becomes active.
* Otherwise, loop till the server is stopped or aborted.
*/
protected void waitForMasterActive(){
boolean tablesOnMaster = BaseLoadBalancer.tablesOnMaster(conf);
while (!(tablesOnMaster && isActiveMaster)
&& !isStopped() && !isAborted()) {
sleeper.sleep();
}
}
@VisibleForTesting
public MasterRpcServices getMasterRpcServices() {
return (MasterRpcServices)rpcServices;
}
public boolean balanceSwitch(final boolean b) throws IOException {
return getMasterRpcServices().switchBalancer(b, BalanceSwitchMode.ASYNC);
}
protected String getProcessName() {
return MASTER;
}
protected boolean canCreateBaseZNode() {
return true;
}
protected boolean canUpdateTableDescriptor() {
return true;
}
protected RSRpcServices createRpcServices() throws IOException {
return new MasterRpcServices(this);
}
protected void configureInfoServer() {
infoServer.addServlet("master-status", "/master-status", MasterStatusServlet.class);
infoServer.setAttribute(MASTER, this);
if (BaseLoadBalancer.tablesOnMaster(conf)) {
super.configureInfoServer();
}
}
protected Class getDumpServlet() {
return MasterDumpServlet.class;
}
/**
* Emit the HMaster metrics, such as region in transition metrics.
* Surrounding in a try block just to be sure metrics doesn't abort HMaster.
*/
protected void doMetrics() {
try {
if (assignmentManager != null) {
assignmentManager.updateRegionsInTransitionMetrics();
}
} catch (Throwable e) {
LOG.error("Couldn't update metrics: " + e.getMessage());
}
}
MetricsMaster getMasterMetrics() {
return metricsMaster;
}
/**
* Initialize all ZK based system trackers.
* @throws IOException
* @throws InterruptedException
* @throws KeeperException
* @throws CoordinatedStateException
*/
void initializeZKBasedSystemTrackers() throws IOException,
InterruptedException, KeeperException, CoordinatedStateException {
this.balancer = LoadBalancerFactory.getLoadBalancer(conf);
this.loadBalancerTracker = new LoadBalancerTracker(zooKeeper, this);
this.loadBalancerTracker.start();
this.assignmentManager = new AssignmentManager(this, serverManager,
this.balancer, this.service, this.metricsMaster,
this.tableLockManager);
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()) +
", setting cluster-up flag (Was=" + wasUp + ")");
// create/initialize the snapshot manager and other procedure managers
this.snapshotManager = new SnapshotManager();
this.mpmHost = new MasterProcedureManagerHost();
this.mpmHost.register(this.snapshotManager);
this.mpmHost.register(new MasterFlushTableProcedureManager());
this.mpmHost.loadProcedures(conf);
this.mpmHost.initialize(this, this.metricsMaster);
}
/**
* Finish initialization of HMaster after becoming the primary master.
*
*
* - Initialize master components - file system manager, server manager,
* assignment manager, region server tracker, etc
* - Start necessary service threads - balancer, catalog janior,
* executor services, etc
* - Set cluster as UP in ZooKeeper
* - Wait for RegionServers to check-in
* - Split logs and perform data recovery, if necessary
* - Ensure assignment of meta/namespace regions
-
*
- Handle either fresh cluster start or master failover
*
*
* @throws IOException
* @throws InterruptedException
* @throws KeeperException
* @throws CoordinatedStateException
*/
private void finishActiveMasterInitialization(MonitoredTask status)
throws IOException, InterruptedException, KeeperException, CoordinatedStateException {
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);
// enable table descriptors cache
this.tableDescriptors.setCacheOn();
// warm-up HTDs cache on master initialization
if (preLoadTableDescriptors) {
status.setStatus("Pre-loading table descriptors");
this.tableDescriptors.getAll();
}
// publish cluster ID
status.setStatus("Publishing Cluster ID in ZooKeeper");
ZKClusterId.setClusterId(this.zooKeeper, fileSystemManager.getClusterId());
this.serverManager = createServerManager(this, this);
setupClusterConnection();
// Invalidate all write locks held previously
this.tableLockManager.reapWriteLocks();
status.setStatus("Initializing ZK system trackers");
initializeZKBasedSystemTrackers();
// initialize master side coprocessors before we start handling requests
status.setStatus("Initializing master coprocessors");
this.cpHost = new MasterCoprocessorHost(this, this.conf);
// start up all service threads.
status.setStatus("Initializing master service threads");
startServiceThreads();
// Wake up this server to check in
sleeper.skipSleepCycle();
// 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()) {
// The isServerOnline check is opportunistic, correctness is handled inside
if (!this.serverManager.isServerOnline(sn)
&& serverManager.checkAndRecordNewServer(sn, ServerLoad.EMPTY_SERVERLOAD)) {
LOG.info("Registered server found up in zk but who has not yet reported in: " + sn);
}
}
// get a list for previously failed RS which need log splitting work
// we recover hbase:meta region servers inside master initialization and
// handle other failed servers in SSH in order to start up master node ASAP
Set previouslyFailedServers = this.fileSystemManager
.getFailedServersFromLogFolders();
// remove stale recovering regions from previous run
this.fileSystemManager.removeStaleRecoveringRegionsFromZK(previouslyFailedServers);
// log splitting for hbase:meta server
ServerName oldMetaServerLocation = metaTableLocator.getMetaRegionLocation(this.getZooKeeper());
if (oldMetaServerLocation != null && previouslyFailedServers.contains(oldMetaServerLocation)) {
splitMetaLogBeforeAssignment(oldMetaServerLocation);
// Note: we can't remove oldMetaServerLocation from previousFailedServers list because it
// may also host user regions
}
Set previouslyFailedMetaRSs = getPreviouselyFailedMetaServersFromZK();
// need to use union of previouslyFailedMetaRSs recorded in ZK and previouslyFailedServers
// instead of previouslyFailedMetaRSs alone to address the following two situations:
// 1) the chained failure situation(recovery failed multiple times in a row).
// 2) master get killed right before it could delete the recovering hbase:meta from ZK while the
// same server still has non-meta wals to be replayed so that
// removeStaleRecoveringRegionsFromZK can't delete the stale hbase:meta region
// Passing more servers into splitMetaLog is all right. If a server doesn't have hbase:meta wal,
// there is no op for the server.
previouslyFailedMetaRSs.addAll(previouslyFailedServers);
this.initializationBeforeMetaAssignment = true;
// Wait for regionserver to finish initialization.
if (BaseLoadBalancer.tablesOnMaster(conf)) {
waitForServerOnline();
}
//initialize load balancer
this.balancer.setClusterStatus(getClusterStatus());
this.balancer.setMasterServices(this);
this.balancer.initialize();
// Check if master is shutting down because of some issue
// in initializing the regionserver or the balancer.
if(isStopped()) return;
// Make sure meta assigned before proceeding.
status.setStatus("Assigning Meta Region");
assignMeta(status, previouslyFailedMetaRSs);
// check if master is shutting down because above assignMeta could return even hbase:meta isn't
// assigned when master is shutting down
if(isStopped()) return;
status.setStatus("Submitting log splitting work for previously failed region servers");
// Master has recovered hbase:meta region server and we put
// other failed region servers in a queue to be handled later by SSH
for (ServerName tmpServer : previouslyFailedServers) {
this.serverManager.processDeadServer(tmpServer, true);
}
// Update meta with new PB serialization if required. i.e migrate all HRI to PB serialization
// in meta. This must happen before we assign all user regions or else the assignment will
// fail.
if (this.conf.getBoolean("hbase.MetaMigrationConvertingToPB", true)) {
MetaMigrationConvertingToPB.updateMetaIfNecessary(this);
}
// Fix up assignment manager status
status.setStatus("Starting assignment manager");
this.assignmentManager.joinCluster();
//set cluster status again after user regions are assigned
this.balancer.setClusterStatus(getClusterStatus());
// Start balancer and meta catalog janitor after meta and regions have
// been assigned.
status.setStatus("Starting balancer and catalog janitor");
this.clusterStatusChore = new ClusterStatusChore(this, balancer);
Threads.setDaemonThreadRunning(clusterStatusChore.getThread());
this.balancerChore = new BalancerChore(this);
Threads.setDaemonThreadRunning(balancerChore.getThread());
this.catalogJanitorChore = new CatalogJanitor(this, this);
Threads.setDaemonThreadRunning(catalogJanitorChore.getThread());
status.setStatus("Starting namespace manager");
initNamespace();
if (this.cpHost != null) {
try {
this.cpHost.preMasterInitialization();
} catch (IOException e) {
LOG.error("Coprocessor preMasterInitialization() hook failed", e);
}
}
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 (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);
}
}
}
/**
* Create a {@link ServerManager} instance.
* @param master
* @param services
* @return An instance of {@link ServerManager}
* @throws org.apache.hadoop.hbase.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);
}
/**
* Check hbase:meta is assigned. If not, assign it.
* @param status MonitoredTask
* @param previouslyFailedMetaRSs
* @throws InterruptedException
* @throws IOException
* @throws KeeperException
*/
void assignMeta(MonitoredTask status, Set previouslyFailedMetaRSs)
throws InterruptedException, IOException, KeeperException {
// Work on meta region
int assigned = 0;
long timeout = this.conf.getLong("hbase.catalog.verification.timeout", 1000);
status.setStatus("Assigning hbase:meta region");
// Get current meta state from zk.
RegionStates regionStates = assignmentManager.getRegionStates();
RegionState metaState = MetaTableLocator.getMetaRegionState(getZooKeeper());
ServerName currentMetaServer = metaState.getServerName();
if (!ConfigUtil.useZKForAssignment(conf)) {
regionStates.createRegionState(HRegionInfo.FIRST_META_REGIONINFO, metaState.getState(),
currentMetaServer, null);
} else {
regionStates.createRegionState(HRegionInfo.FIRST_META_REGIONINFO);
}
boolean rit = this.assignmentManager.
processRegionInTransitionAndBlockUntilAssigned(HRegionInfo.FIRST_META_REGIONINFO);
boolean metaRegionLocation = metaTableLocator.verifyMetaRegionLocation(
this.getConnection(), this.getZooKeeper(), timeout);
if (!metaRegionLocation || !metaState.isOpened()) {
// Meta location is not verified. It should be in transition, or offline.
// We will wait for it to be assigned in enableSSHandWaitForMeta below.
assigned++;
if (!ConfigUtil.useZKForAssignment(conf)) {
assignMetaZkLess(regionStates, metaState, timeout, previouslyFailedMetaRSs);
} else if (!rit) {
// Assign meta since not already in transition
if (currentMetaServer != null) {
// If the meta server is not known to be dead or online,
// just split the meta log, and don't expire it since this
// could be a full cluster restart. Otherwise, we will think
// this is a failover and lose previous region locations.
// If it is really a failover case, AM will find out in rebuilding
// user regions. Otherwise, we are good since all logs are split
// or known to be replayed before user regions are assigned.
if (serverManager.isServerOnline(currentMetaServer)) {
LOG.info("Forcing expire of " + currentMetaServer);
serverManager.expireServer(currentMetaServer);
}
splitMetaLogBeforeAssignment(currentMetaServer);
previouslyFailedMetaRSs.add(currentMetaServer);
}
assignmentManager.assignMeta();
}
} else {
// Region already assigned. We didn't assign it. Add to in-memory state.
regionStates.updateRegionState(
HRegionInfo.FIRST_META_REGIONINFO, State.OPEN, currentMetaServer);
this.assignmentManager.regionOnline(
HRegionInfo.FIRST_META_REGIONINFO, currentMetaServer);
}
enableMeta(TableName.META_TABLE_NAME);
if ((RecoveryMode.LOG_REPLAY == this.getMasterFileSystem().getLogRecoveryMode())
&& (!previouslyFailedMetaRSs.isEmpty())) {
// replay WAL edits mode need new hbase:meta RS is assigned firstly
status.setStatus("replaying log for Meta Region");
this.fileSystemManager.splitMetaLog(previouslyFailedMetaRSs);
}
// Make sure a hbase:meta location is set. We need to enable SSH here since
// if the meta region server is died at this time, we need it to be re-assigned
// by SSH so that system tables can be assigned.
// No need to wait for meta is assigned = 0 when meta is just verified.
enableServerShutdownHandler(assigned != 0);
LOG.info("hbase:meta assigned=" + assigned + ", rit=" + rit +
", location=" + metaTableLocator.getMetaRegionLocation(this.getZooKeeper()));
status.setStatus("META assigned.");
}
private void assignMetaZkLess(RegionStates regionStates, RegionState regionState, long timeout,
Set previouslyFailedRs) throws IOException, KeeperException {
ServerName currentServer = regionState.getServerName();
if (serverManager.isServerOnline(currentServer)) {
LOG.info("Meta was in transition on " + currentServer);
assignmentManager.processRegionInTransitionZkLess();
} else {
if (currentServer != null) {
splitMetaLogBeforeAssignment(currentServer);
regionStates.logSplit(HRegionInfo.FIRST_META_REGIONINFO);
previouslyFailedRs.add(currentServer);
}
LOG.info("Re-assigning hbase:meta, it was on " + currentServer);
regionStates.updateRegionState(HRegionInfo.FIRST_META_REGIONINFO, State.OFFLINE);
assignmentManager.assignMeta();
}
}
void initNamespace() throws IOException {
//create namespace manager
tableNamespaceManager = new TableNamespaceManager(this);
tableNamespaceManager.start();
}
boolean isCatalogJanitorEnabled() {
return catalogJanitorChore != null ?
catalogJanitorChore.getEnabled() : false;
}
private void splitMetaLogBeforeAssignment(ServerName currentMetaServer) throws IOException {
if (RecoveryMode.LOG_REPLAY == this.getMasterFileSystem().getLogRecoveryMode()) {
// In log replay mode, we mark hbase:meta region as recovering in ZK
Set regions = new HashSet();
regions.add(HRegionInfo.FIRST_META_REGIONINFO);
this.fileSystemManager.prepareLogReplay(currentMetaServer, regions);
} else {
// In recovered.edits mode: create recovered edits file for hbase:meta server
this.fileSystemManager.splitMetaLog(currentMetaServer);
}
}
private void enableServerShutdownHandler(
final boolean waitForMeta) throws IOException, InterruptedException {
// If ServerShutdownHandler is disabled, we enable it and expire those dead
// but not expired servers. This is required so that if meta is assigning to
// a server which dies after assignMeta starts assignment,
// SSH can re-assign it. Otherwise, we will be
// stuck here waiting forever if waitForMeta is specified.
if (!serverShutdownHandlerEnabled) {
serverShutdownHandlerEnabled = true;
this.serverManager.processQueuedDeadServers();
}
if (waitForMeta) {
metaTableLocator.waitMetaRegionLocation(this.getZooKeeper());
// Above check waits for general meta availability but this does not
// guarantee that the transition has completed
this.assignmentManager.waitForAssignment(HRegionInfo.FIRST_META_REGIONINFO);
}
}
private void enableMeta(TableName metaTableName) {
if (!this.assignmentManager.getTableStateManager().isTableState(metaTableName,
ZooKeeperProtos.Table.State.ENABLED)) {
this.assignmentManager.setEnabledTable(metaTableName);
}
}
/**
* This function returns a set of region server names under hbase:meta recovering region ZK node
* @return Set of meta server names which were recorded in ZK
* @throws KeeperException
*/
private Set getPreviouselyFailedMetaServersFromZK() throws KeeperException {
Set result = new HashSet();
String metaRecoveringZNode = ZKUtil.joinZNode(zooKeeper.recoveringRegionsZNode,
HRegionInfo.FIRST_META_REGIONINFO.getEncodedName());
List regionFailedServers = ZKUtil.listChildrenNoWatch(zooKeeper, metaRecoveringZNode);
if (regionFailedServers == null) return result;
for(String failedServer : regionFailedServers) {
ServerName server = ServerName.parseServerName(failedServer);
result.add(server);
}
return result;
}
@Override
public TableDescriptors getTableDescriptors() {
return this.tableDescriptors;
}
@Override
public ServerManager getServerManager() {
return this.serverManager;
}
@Override
public MasterFileSystem getMasterFileSystem() {
return this.fileSystemManager;
}
/*
* 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.
*/
private void startServiceThreads() throws IOException{
// Start the executor service pools
this.service.startExecutorService(ExecutorType.MASTER_OPEN_REGION,
conf.getInt("hbase.master.executor.openregion.threads", 5));
this.service.startExecutorService(ExecutorType.MASTER_CLOSE_REGION,
conf.getInt("hbase.master.executor.closeregion.threads", 5));
this.service.startExecutorService(ExecutorType.MASTER_SERVER_OPERATIONS,
conf.getInt("hbase.master.executor.serverops.threads", 5));
this.service.startExecutorService(ExecutorType.MASTER_META_SERVER_OPERATIONS,
conf.getInt("hbase.master.executor.serverops.threads", 5));
this.service.startExecutorService(ExecutorType.M_LOG_REPLAY_OPS,
conf.getInt("hbase.master.executor.logreplayops.threads", 10));
// 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.
// Any time changing this maxThreads to > 1, pls see the comment at
// AccessController#postCreateTableHandler
this.service.startExecutorService(ExecutorType.MASTER_TABLE_OPERATIONS, 1);
// Start log cleaner thread
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(),
getServerName().toShortString() + ".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(),
getServerName().toShortString() + ".archivedHFileCleaner");
serviceStarted = true;
if (LOG.isTraceEnabled()) {
LOG.trace("Started service threads");
}
}
protected void stopServiceThreads() {
if (masterJettyServer != null) {
LOG.info("Stopping master jetty server");
try {
masterJettyServer.stop();
} catch (Exception e) {
LOG.error("Failed to stop master jetty server", e);
}
}
super.stopServiceThreads();
stopChores();
// Wait for all the remaining region servers to report in IFF we were
// running a cluster shutdown AND we were NOT aborting.
if (!isAborted() && this.serverManager != null &&
this.serverManager.isClusterShutdown()) {
this.serverManager.letRegionServersShutdown();
}
if (LOG.isDebugEnabled()) {
LOG.debug("Stopping service threads");
}
// Clean up and close up shop
if (this.logCleaner!= null) this.logCleaner.interrupt();
if (this.hfileCleaner != null) this.hfileCleaner.interrupt();
if (this.activeMasterManager != null) this.activeMasterManager.stop();
if (this.serverManager != null) this.serverManager.stop();
if (this.assignmentManager != null) this.assignmentManager.stop();
if (this.fileSystemManager != null) this.fileSystemManager.stop();
if (this.mpmHost != null) this.mpmHost.stop("server shutting down.");
}
private void stopChores() {
if (this.balancerChore != null) {
this.balancerChore.interrupt();
}
if (this.clusterStatusChore != null) {
this.clusterStatusChore.interrupt();
}
if (this.catalogJanitorChore != null) {
this.catalogJanitorChore.interrupt();
}
if (this.clusterStatusPublisherChore != null){
clusterStatusPublisherChore.interrupt();
}
}
/**
* @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.
InetAddress ia = RpcServer.getRemoteIp();
// The call could be from the local regionserver,
// in which case, there is no remote address.
if (ia == null && serverStartCode == startcode) {
InetSocketAddress isa = rpcServices.getSocketAddress();
if (isa != null && isa.getPort() == port) {
ia = isa.getAddress();
}
}
return ia;
}
/**
* @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
int balancerPeriod =
getConfiguration().getInt("hbase.balancer.period", 300000);
balancerCutoffTime = balancerPeriod;
// 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;
}
// Do this call outside of synchronized block.
int maximumBalanceTime = getBalancerCutoffTime();
synchronized (this.balancer) {
// If balance not true, don't run balancer.
if (!this.loadBalancerTracker.isBalancerOn()) return false;
// Only allow one balance run at at time.
if (this.assignmentManager.getRegionStates().isRegionsInTransition()) {
Map 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) {
try {
if (this.cpHost.preBalance()) {
LOG.debug("Coprocessor bypassing balancer request");
return false;
}
} catch (IOException ioe) {
LOG.error("Error invoking master coprocessor preBalance()", ioe);
return false;
}
}
Map>> assignmentsByTable =
this.assignmentManager.getRegionStates().getAssignmentsByTable();
List plans = new ArrayList();
//Give the balancer the current cluster state.
this.balancer.setClusterStatus(getClusterStatus());
for (Map> assignments : assignmentsByTable.values()) {
List partialPlans = this.balancer.balanceCluster(assignments);
if (partialPlans != null) plans.addAll(partialPlans);
}
long cutoffTime = System.currentTimeMillis() + maximumBalanceTime;
int rpCount = 0; // number of RegionPlans balanced so far
long totalRegPlanExecTime = 0;
if (plans != null && !plans.isEmpty()) {
for (RegionPlan plan: plans) {
LOG.info("balance " + plan);
long balStartTime = System.currentTimeMillis();
//TODO: bulk assign
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) {
//TODO: After balance, there should not be a cutoff time (keeping it as a security net for now)
LOG.debug("No more balancing till next balance run; maximumBalanceTime=" +
maximumBalanceTime);
break;
}
}
}
if (this.cpHost != null) {
try {
this.cpHost.postBalance(rpCount < plans.size() ? plans.subList(0, rpCount) : plans);
} catch (IOException ioe) {
// balancing already succeeded so don't change the result
LOG.error("Error invoking master coprocessor postBalance()", ioe);
}
}
}
// If LoadBalancer did not generate any plans, it means the cluster is already balanced.
// Return true indicating a success.
return true;
}
/**
* @return Client info for use as prefix on an audit log string; who did an action
*/
String getClientIdAuditPrefix() {
return "Client=" + RequestContext.getRequestUserName() + "/" +
RequestContext.get().getRemoteAddress();
}
/**
* 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) {
this.catalogJanitorChore.setEnabled(b);
}
@Override
public void dispatchMergingRegions(final HRegionInfo region_a,
final HRegionInfo region_b, final boolean forcible) throws IOException {
checkInitialized();
this.service.submit(new DispatchMergingRegionHandler(this,
this.catalogJanitorChore, region_a, region_b, forcible));
}
void move(final byte[] encodedRegionName,
final byte[] destServerName) throws HBaseIOException {
RegionState regionState = assignmentManager.getRegionStates().
getRegionState(Bytes.toString(encodedRegionName));
if (regionState == null) {
throw 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 destServers = this.serverManager.createDestinationServersList(
regionState.getServerName());
dest = balancer.randomAssignment(hri, destServers);
if (dest == null) {
LOG.debug("Unable to determine a plan to assign " + hri);
return;
}
} else {
dest = ServerName.valueOf(Bytes.toString(destServerName));
if (dest.equals(serverName) && balancer instanceof BaseLoadBalancer
&& !((BaseLoadBalancer)balancer).shouldBeOnMaster(hri)) {
// To avoid unnecessary region moving later by balancer. Don't put user
// regions on master. Regions on master could be put on other region
// server intentionally by test however.
LOG.debug("Skipping move of region " + hri.getRegionNameAsString()
+ " to avoid unnecessary region moving later by load balancer,"
+ " because it should not be on master");
return;
}
}
if (dest.equals(regionState.getServerName())) {
LOG.debug("Skipping move of region " + hri.getRegionNameAsString()
+ " because region already assigned to the same server " + dest + ".");
return;
}
// Now we can do the move
RegionPlan rp = new RegionPlan(hri, regionState.getServerName(), dest);
try {
checkInitialized();
if (this.cpHost != null) {
if (this.cpHost.preMove(hri, rp.getSource(), rp.getDestination())) {
return;
}
}
LOG.info(getClientIdAuditPrefix() + " move " + rp + ", running balancer");
this.assignmentManager.balance(rp);
if (this.cpHost != null) {
this.cpHost.postMove(hri, rp.getSource(), rp.getDestination());
}
} catch (IOException ioe) {
if (ioe instanceof HBaseIOException) {
throw (HBaseIOException)ioe;
}
throw new HBaseIOException(ioe);
}
}
@Override
public void createTable(HTableDescriptor hTableDescriptor,
byte [][] splitKeys) throws IOException {
if (isStopped()) {
throw new MasterNotRunningException();
}
String namespace = hTableDescriptor.getTableName().getNamespaceAsString();
getNamespaceDescriptor(namespace); // ensure namespace exists
HRegionInfo[] newRegions = getHRegionInfos(hTableDescriptor, splitKeys);
checkInitialized();
sanityCheckTableDescriptor(hTableDescriptor);
if (cpHost != null) {
cpHost.preCreateTable(hTableDescriptor, newRegions);
}
LOG.info(getClientIdAuditPrefix() + " create " + hTableDescriptor);
this.service.submit(new CreateTableHandler(this,
this.fileSystemManager, hTableDescriptor, conf,
newRegions, this).prepare());
if (cpHost != null) {
cpHost.postCreateTable(hTableDescriptor, newRegions);
}
}
/**
* Checks whether the table conforms to some sane limits, and configured
* values (compression, etc) work. Throws an exception if something is wrong.
* @throws IOException
*/
private void sanityCheckTableDescriptor(final HTableDescriptor htd) throws IOException {
final String CONF_KEY = "hbase.table.sanity.checks";
if (!conf.getBoolean(CONF_KEY, true)) {
return;
}
String tableVal = htd.getConfigurationValue(CONF_KEY);
if (tableVal != null && !Boolean.valueOf(tableVal)) {
return;
}
// check max file size
long maxFileSizeLowerLimit = 2 * 1024 * 1024L; // 2M is the default lower limit
long maxFileSize = htd.getMaxFileSize();
if (maxFileSize < 0) {
maxFileSize = conf.getLong(HConstants.HREGION_MAX_FILESIZE, maxFileSizeLowerLimit);
}
if (maxFileSize < conf.getLong("hbase.hregion.max.filesize.limit", maxFileSizeLowerLimit)) {
throw new DoNotRetryIOException("MAX_FILESIZE for table descriptor or "
+ "\"hbase.hregion.max.filesize\" (" + maxFileSize
+ ") is too small, which might cause over splitting into unmanageable "
+ "number of regions. Set " + CONF_KEY + " to false at conf or table descriptor "
+ "if you want to bypass sanity checks");
}
// check flush size
long flushSizeLowerLimit = 1024 * 1024L; // 1M is the default lower limit
long flushSize = htd.getMemStoreFlushSize();
if (flushSize < 0) {
flushSize = conf.getLong(HConstants.HREGION_MEMSTORE_FLUSH_SIZE, flushSizeLowerLimit);
}
if (flushSize < conf.getLong("hbase.hregion.memstore.flush.size.limit", flushSizeLowerLimit)) {
throw new DoNotRetryIOException("MEMSTORE_FLUSHSIZE for table descriptor or "
+ "\"hbase.hregion.memstore.flush.size\" ("+flushSize+") is too small, which might cause"
+ " very frequent flushing. Set " + CONF_KEY + " to false at conf or table descriptor "
+ "if you want to bypass sanity checks");
}
// check split policy class can be loaded
try {
RegionSplitPolicy.getSplitPolicyClass(htd, conf);
} catch (Exception ex) {
throw new DoNotRetryIOException(ex);
}
// check compression can be loaded
checkCompression(htd);
// check that we have at least 1 CF
if (htd.getColumnFamilies().length == 0) {
throw new DoNotRetryIOException("Table should have at least one column family "
+ "Set "+CONF_KEY+" at conf or table descriptor if you want to bypass sanity checks");
}
for (HColumnDescriptor hcd : htd.getColumnFamilies()) {
if (hcd.getTimeToLive() <= 0) {
throw new DoNotRetryIOException("TTL for column family " + hcd.getNameAsString()
+ " must be positive. Set " + CONF_KEY + " to false at conf or table descriptor "
+ "if you want to bypass sanity checks");
}
// check blockSize
if (hcd.getBlocksize() < 1024 || hcd.getBlocksize() > 16 * 1024 * 1024) {
throw new DoNotRetryIOException("Block size for column family " + hcd.getNameAsString()
+ " must be between 1K and 16MB Set "+CONF_KEY+" to false at conf or table descriptor "
+ "if you want to bypass sanity checks");
}
// check versions
if (hcd.getMinVersions() < 0) {
throw new DoNotRetryIOException("Min versions for column family " + hcd.getNameAsString()
+ " must be positive. Set " + CONF_KEY + " to false at conf or table descriptor "
+ "if you want to bypass sanity checks");
}
// max versions already being checked
// check replication scope
if (hcd.getScope() < 0) {
throw new DoNotRetryIOException("Replication scope for column family "
+ hcd.getNameAsString() + " must be positive. Set " + CONF_KEY + " to false at conf "
+ "or table descriptor if you want to bypass sanity checks");
}
// TODO: should we check coprocessors and encryption ?
}
}
private void startActiveMasterManager() throws KeeperException {
String backupZNode = ZKUtil.joinZNode(
zooKeeper.backupMasterAddressesZNode, serverName.toString());
/*
* Add a ZNode for ourselves in the backup master directory since we
* may not become the active master. If so, we want the actual active
* master to know we are backup masters, so that it won't assign
* regions to us if so configured.
*
* If we become the active master later, ActiveMasterManager will delete
* this node explicitly. If we crash before then, ZooKeeper will delete
* this node for us since it is ephemeral.
*/
LOG.info("Adding backup master ZNode " + backupZNode);
if (!MasterAddressTracker.setMasterAddress(zooKeeper, backupZNode,
serverName, masterInfoPort)) {
LOG.warn("Failed create of " + backupZNode + " by " + serverName);
}
activeMasterManager = new ActiveMasterManager(zooKeeper, this.serverName,
masterInfoPort, this);
// Start a thread to try to become the active master, so we won't block here
Threads.setDaemonThreadRunning(new Thread(new Runnable() {
public void run() {
int timeout = conf.getInt(HConstants.ZK_SESSION_TIMEOUT,
HConstants.DEFAULT_ZK_SESSION_TIMEOUT);
// If we're a backup master, stall until a primary to writes his address
if (conf.getBoolean(HConstants.MASTER_TYPE_BACKUP,
HConstants.DEFAULT_MASTER_TYPE_BACKUP)) {
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 (!activeMasterManager.hasActiveMaster()) {
LOG.debug("Waiting for master address ZNode to be written "
+ "(Also watching cluster state node)");
Threads.sleep(timeout);
}
}
MonitoredTask status = TaskMonitor.get().createStatus("Master startup");
status.setDescription("Master startup");
try {
if (activeMasterManager.blockUntilBecomingActiveMaster(timeout, status)) {
finishActiveMasterInitialization(status);
}
} catch (Throwable t) {
status.setStatus("Failed to become active: " + t.getMessage());
LOG.fatal("Failed to become active master", 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 {
status.cleanup();
}
}
}, getServerName().toShortString() + ".activeMasterManager"));
}
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());
}
private HRegionInfo[] getHRegionInfos(HTableDescriptor hTableDescriptor,
byte[][] splitKeys) {
long regionId = System.currentTimeMillis();
HRegionInfo[] hRegionInfos = null;
if (splitKeys == null || splitKeys.length == 0) {
hRegionInfos = new HRegionInfo[]{new HRegionInfo(hTableDescriptor.getTableName(), null, null,
false, regionId)};
} 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.getTableName(), startKey, endKey,
false, regionId);
startKey = endKey;
}
}
return hRegionInfos;
}
private static boolean isCatalogTable(final TableName tableName) {
return tableName.equals(TableName.META_TABLE_NAME);
}
@Override
public void deleteTable(final TableName tableName) throws IOException {
checkInitialized();
if (cpHost != null) {
cpHost.preDeleteTable(tableName);
}
LOG.info(getClientIdAuditPrefix() + " delete " + tableName);
this.service.submit(new DeleteTableHandler(tableName, this, this).prepare());
if (cpHost != null) {
cpHost.postDeleteTable(tableName);
}
}
@Override
public void truncateTable(TableName tableName, boolean preserveSplits) throws IOException {
checkInitialized();
if (cpHost != null) {
cpHost.preTruncateTable(tableName);
}
LOG.info(getClientIdAuditPrefix() + " truncate " + tableName);
TruncateTableHandler handler = new TruncateTableHandler(tableName, this, this, preserveSplits);
handler.prepare();
handler.process();
if (cpHost != null) {
cpHost.postTruncateTable(tableName);
}
}
@Override
public void addColumn(final TableName tableName, final HColumnDescriptor columnDescriptor)
throws IOException {
checkInitialized();
checkCompression(columnDescriptor);
if (cpHost != null) {
if (cpHost.preAddColumn(tableName, columnDescriptor)) {
return;
}
}
//TODO: we should process this (and some others) in an executor
new TableAddFamilyHandler(tableName, columnDescriptor, this, this).prepare().process();
if (cpHost != null) {
cpHost.postAddColumn(tableName, columnDescriptor);
}
}
@Override
public void modifyColumn(TableName tableName, HColumnDescriptor descriptor)
throws IOException {
checkInitialized();
checkCompression(descriptor);
if (cpHost != null) {
if (cpHost.preModifyColumn(tableName, descriptor)) {
return;
}
}
LOG.info(getClientIdAuditPrefix() + " modify " + descriptor);
new TableModifyFamilyHandler(tableName, descriptor, this, this)
.prepare().process();
if (cpHost != null) {
cpHost.postModifyColumn(tableName, descriptor);
}
}
@Override
public void deleteColumn(final TableName tableName, final byte[] columnName)
throws IOException {
checkInitialized();
if (cpHost != null) {
if (cpHost.preDeleteColumn(tableName, columnName)) {
return;
}
}
LOG.info(getClientIdAuditPrefix() + " delete " + Bytes.toString(columnName));
new TableDeleteFamilyHandler(tableName, columnName, this, this).prepare().process();
if (cpHost != null) {
cpHost.postDeleteColumn(tableName, columnName);
}
}
@Override
public void enableTable(final TableName tableName) throws IOException {
checkInitialized();
if (cpHost != null) {
cpHost.preEnableTable(tableName);
}
LOG.info(getClientIdAuditPrefix() + " enable " + tableName);
this.service.submit(new EnableTableHandler(this, tableName,
assignmentManager, tableLockManager, false).prepare());
if (cpHost != null) {
cpHost.postEnableTable(tableName);
}
}
@Override
public void disableTable(final TableName tableName) throws IOException {
checkInitialized();
if (cpHost != null) {
cpHost.preDisableTable(tableName);
}
LOG.info(getClientIdAuditPrefix() + " disable " + tableName);
this.service.submit(new DisableTableHandler(this, tableName,
assignmentManager, tableLockManager, false).prepare());
if (cpHost != null) {
cpHost.postDisableTable(tableName);
}
}
/**
* 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.
*/
@VisibleForTesting // Used by TestMaster.
Pair getTableRegionForRow(
final TableName tableName, final byte [] rowKey)
throws IOException {
final AtomicReference> result =
new AtomicReference>(null);
MetaScannerVisitor visitor =
new MetaScannerVisitorBase() {
@Override
public boolean processRow(Result data) throws IOException {
if (data == null || data.size() <= 0) {
return true;
}
Pair pair = HRegionInfo.getHRegionInfoAndServerName(data);
if (pair == null) {
return false;
}
if (!pair.getFirst().getTable().equals(tableName)) {
return false;
}
result.set(pair);
return true;
}
};
MetaScanner.metaScan(conf, visitor, tableName, rowKey, 1);
return result.get();
}
@Override
public void modifyTable(final TableName tableName, final HTableDescriptor descriptor)
throws IOException {
checkInitialized();
sanityCheckTableDescriptor(descriptor);
if (cpHost != null) {
cpHost.preModifyTable(tableName, descriptor);
}
LOG.info(getClientIdAuditPrefix() + " modify " + tableName);
new ModifyTableHandler(tableName, descriptor, this, this).prepare().process();
if (cpHost != null) {
cpHost.postModifyTable(tableName, descriptor);
}
}
@Override
public void checkTableModifiable(final TableName tableName)
throws IOException, TableNotFoundException, TableNotDisabledException {
if (isCatalogTable(tableName)) {
throw new IOException("Can't modify catalog tables");
}
if (!MetaTableAccessor.tableExists(getConnection(), tableName)) {
throw new TableNotFoundException(tableName);
}
if (!getAssignmentManager().getTableStateManager().
isTableState(tableName, ZooKeeperProtos.Table.State.DISABLED)) {
throw new TableNotDisabledException(tableName);
}
}
/**
* @return cluster status
*/
public ClusterStatus getClusterStatus() throws InterruptedIOException {
// Build Set of backup masters from ZK nodes
List 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(0);
}
List backupMasters = new ArrayList(
backupMasterStrings.size());
for (String s: backupMasterStrings) {
try {
byte [] bytes;
try {
bytes = ZKUtil.getData(this.zooKeeper, ZKUtil.joinZNode(
this.zooKeeper.backupMasterAddressesZNode, s));
} catch (InterruptedException e) {
throw new InterruptedIOException();
}
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() {
@Override
public int compare(ServerName s1, ServerName s2) {
return s1.getServerName().compareTo(s2.getServerName());
}});
String clusterId = fileSystemManager != null ?
fileSystemManager.getClusterId().toString() : null;
Map regionsInTransition = assignmentManager != null ?
assignmentManager.getRegionStates().getRegionsInTransition() : null;
String[] coprocessors = cpHost != null ? getMasterCoprocessors() : null;
boolean balancerOn = loadBalancerTracker != null ?
loadBalancerTracker.isBalancerOn() : false;
Map onlineServers = null;
Set deadServers = null;
if (serverManager != null) {
deadServers = serverManager.getDeadServers().copyServerNames();
onlineServers = serverManager.getOnlineServers();
}
return new ClusterStatus(VersionInfo.getVersion(), clusterId,
onlineServers, deadServers, serverName, backupMasters,
regionsInTransition, coprocessors, balancerOn);
}
/**
* 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 startcode;
}
/**
* @return timestamp in millis when HMaster became the active master.
*/
public long getMasterActiveTime() {
return masterActiveTime;
}
public int getRegionServerInfoPort(final ServerName sn) {
RegionServerInfo info = this.regionServerTracker.getRegionServerInfo(sn);
if (info == null || info.getInfoPort() == 0) {
return conf.getInt(HConstants.REGIONSERVER_INFO_PORT,
HConstants.DEFAULT_REGIONSERVER_INFOPORT);
}
return info.getInfoPort();
}
/**
* @return array of coprocessor SimpleNames.
*/
public String[] getMasterCoprocessors() {
Set masterCoprocessors = getMasterCoprocessorHost().getCoprocessors();
return masterCoprocessors.toArray(new String[masterCoprocessors.size()]);
}
@Override
public void abort(final String msg, final Throwable t) {
if (isAborted() || isStopped()) {
return;
}
if (cpHost != null) {
// HBASE-4014: dump a list of loaded coprocessors.
LOG.fatal("Master server abort: loaded coprocessors are: " +
getLoadedCoprocessors());
}
if (t != null) LOG.fatal(msg, t);
stop(msg);
}
@Override
public ZooKeeperWatcher getZooKeeper() {
return zooKeeper;
}
@Override
public MasterCoprocessorHost getMasterCoprocessorHost() {
return cpHost;
}
@Override
public ServerName getServerName() {
return this.serverName;
}
@Override
public AssignmentManager getAssignmentManager() {
return this.assignmentManager;
}
public MemoryBoundedLogMessageBuffer getRegionServerFatalLogBuffer() {
return rsFatals;
}
public void shutdown() {
if (cpHost != null) {
try {
cpHost.preShutdown();
} catch (IOException ioe) {
LOG.error("Error call master coprocessor preShutdown()", ioe);
}
}
if (this.serverManager != null) {
this.serverManager.shutdownCluster();
}
if (this.clusterStatusTracker != null){
try {
this.clusterStatusTracker.setClusterDown();
} catch (KeeperException e) {
LOG.error("ZooKeeper exception trying to set cluster as down in ZK", e);
}
}
}
public void stopMaster() {
if (cpHost != null) {
try {
cpHost.preStopMaster();
} catch (IOException ioe) {
LOG.error("Error call master coprocessor preStopMaster()", ioe);
}
}
stop("Stopped by " + Thread.currentThread().getName());
}
void checkServiceStarted() throws ServerNotRunningYetException {
if (!serviceStarted) {
throw new ServerNotRunningYetException("Server is not running yet");
}
}
void checkInitialized() throws PleaseHoldException, ServerNotRunningYetException {
checkServiceStarted();
if (!this.initialized) {
throw new PleaseHoldException("Master is initializing");
}
}
void checkNamespaceManagerReady() throws IOException {
checkInitialized();
if (tableNamespaceManager == null ||
!tableNamespaceManager.isTableAvailableAndInitialized()) {
throw new IOException("Table Namespace Manager not ready yet, try again later");
}
}
/**
* 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.
*/
@Override
public boolean isInitialized() {
return initialized;
}
/**
* ServerShutdownHandlerEnabled is set false before completing
* assignMeta to prevent processing of ServerShutdownHandler.
* @return true if assignMeta has completed;
*/
@Override
public boolean isServerShutdownHandlerEnabled() {
return this.serverShutdownHandlerEnabled;
}
/**
* Report whether this master has started initialization and is about to do meta region assignment
* @return true if master is in initialization & about to assign hbase:meta regions
*/
public boolean isInitializationStartsMetaRegionAssignment() {
return this.initializationBeforeMetaAssignment;
}
public void assignRegion(HRegionInfo hri) {
assignmentManager.assign(hri, true);
}
/**
* 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();
}
@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;
}
/**
* Utility for constructing an instance of the passed HMaster class.
* @param masterClass
* @param conf
* @return HMaster instance.
*/
public static HMaster constructMaster(Class masterClass,
final Configuration conf, final CoordinatedStateManager cp) {
try {
Constructor c =
masterClass.getConstructor(Configuration.class, CoordinatedStateManager.class);
return c.newInstance(conf, cp);
} 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;
}
/**
* Exposed for TESTING!
* @return the underlying snapshot manager
*/
public SnapshotManager getSnapshotManagerForTesting() {
return this.snapshotManager;
}
@Override
public void createNamespace(NamespaceDescriptor descriptor) throws IOException {
TableName.isLegalNamespaceName(Bytes.toBytes(descriptor.getName()));
checkNamespaceManagerReady();
if (cpHost != null) {
if (cpHost.preCreateNamespace(descriptor)) {
return;
}
}
LOG.info(getClientIdAuditPrefix() + " creating " + descriptor);
tableNamespaceManager.create(descriptor);
if (cpHost != null) {
cpHost.postCreateNamespace(descriptor);
}
}
@Override
public void modifyNamespace(NamespaceDescriptor descriptor) throws IOException {
TableName.isLegalNamespaceName(Bytes.toBytes(descriptor.getName()));
checkNamespaceManagerReady();
if (cpHost != null) {
if (cpHost.preModifyNamespace(descriptor)) {
return;
}
}
LOG.info(getClientIdAuditPrefix() + " modify " + descriptor);
tableNamespaceManager.update(descriptor);
if (cpHost != null) {
cpHost.postModifyNamespace(descriptor);
}
}
@Override
public void deleteNamespace(String name) throws IOException {
checkNamespaceManagerReady();
if (cpHost != null) {
if (cpHost.preDeleteNamespace(name)) {
return;
}
}
LOG.info(getClientIdAuditPrefix() + " delete " + name);
tableNamespaceManager.remove(name);
if (cpHost != null) {
cpHost.postDeleteNamespace(name);
}
}
@Override
public NamespaceDescriptor getNamespaceDescriptor(String name) throws IOException {
checkNamespaceManagerReady();
NamespaceDescriptor nsd = tableNamespaceManager.get(name);
if (nsd == null) {
throw new NamespaceNotFoundException(name);
}
return nsd;
}
@Override
public List listNamespaceDescriptors() throws IOException {
checkNamespaceManagerReady();
return Lists.newArrayList(tableNamespaceManager.list());
}
@Override
public List listTableDescriptorsByNamespace(String name) throws IOException {
getNamespaceDescriptor(name); // check that namespace exists
return Lists.newArrayList(tableDescriptors.getByNamespace(name).values());
}
@Override
public List listTableNamesByNamespace(String name) throws IOException {
List tableNames = Lists.newArrayList();
getNamespaceDescriptor(name); // check that namespace exists
for (HTableDescriptor descriptor: tableDescriptors.getByNamespace(name).values()) {
tableNames.add(descriptor.getTableName());
}
return tableNames;
}
}