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Server functionality for HBase
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.master;
import java.io.File;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.LocalHBaseCluster;
import org.apache.hadoop.hbase.MasterNotRunningException;
import org.apache.hadoop.hbase.ZNodeClearer;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.hadoop.hbase.trace.TraceUtil;
import org.apache.hadoop.hbase.util.JVMClusterUtil;
import org.apache.hadoop.hbase.util.ServerCommandLine;
import org.apache.hadoop.hbase.zookeeper.MiniZooKeeperCluster;
import org.apache.hadoop.hbase.zookeeper.ZKAuthentication;
import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.zookeeper.KeeperException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hbase.thirdparty.org.apache.commons.cli.CommandLine;
import org.apache.hbase.thirdparty.org.apache.commons.cli.GnuParser;
import org.apache.hbase.thirdparty.org.apache.commons.cli.Options;
import org.apache.hbase.thirdparty.org.apache.commons.cli.ParseException;
@InterfaceAudience.Private
public class HMasterCommandLine extends ServerCommandLine {
private static final Logger LOG = LoggerFactory.getLogger(HMasterCommandLine.class);
private static final String USAGE = "Usage: Master [opts] start|stop|clear\n"
+ " start Start Master. If local mode, start Master and RegionServer in same JVM\n"
+ " stop Start cluster shutdown; Master signals RegionServer shutdown\n"
+ " clear Delete the master znode in ZooKeeper after a master crashes\n "
+ " where [opts] are:\n"
+ " --minRegionServers= Minimum RegionServers needed to host user tables.\n"
+ " --localRegionServers= "
+ "RegionServers to start in master process when in standalone mode.\n"
+ " --masters= Masters to start in this process.\n"
+ " --backup Master should start in backup mode\n"
+ " --shutDownCluster "
+ "Start Cluster shutdown; Master signals RegionServer shutdown";
private final Class masterClass;
public HMasterCommandLine(Class masterClass) {
this.masterClass = masterClass;
}
@Override
protected String getUsage() {
return USAGE;
}
@Override
public int run(String args[]) throws Exception {
boolean shutDownCluster = false;
Options opt = new Options();
opt.addOption("localRegionServers", true,
"RegionServers to start in master process when running standalone");
opt.addOption("masters", true, "Masters to start in this process");
opt.addOption("minRegionServers", true, "Minimum RegionServers needed to host user tables");
opt.addOption("backup", false, "Do not try to become HMaster until the primary fails");
opt.addOption("shutDownCluster", false,
"`hbase master stop --shutDownCluster` shuts down cluster");
CommandLine cmd;
try {
cmd = new GnuParser().parse(opt, args);
} catch (ParseException e) {
LOG.error("Could not parse: ", e);
usage(null);
return 1;
}
if (cmd.hasOption("minRegionServers")) {
String val = cmd.getOptionValue("minRegionServers");
getConf().setInt("hbase.regions.server.count.min", Integer.parseInt(val));
LOG.debug("minRegionServers set to " + val);
}
// minRegionServers used to be minServers. Support it too.
if (cmd.hasOption("minServers")) {
String val = cmd.getOptionValue("minServers");
getConf().setInt("hbase.regions.server.count.min", Integer.parseInt(val));
LOG.debug("minServers set to " + val);
}
// check if we are the backup master - override the conf if so
if (cmd.hasOption("backup")) {
getConf().setBoolean(HConstants.MASTER_TYPE_BACKUP, true);
}
// How many regionservers to startup in this process (we run regionservers in same process as
// master when we are in local/standalone mode. Useful testing)
if (cmd.hasOption("localRegionServers")) {
String val = cmd.getOptionValue("localRegionServers");
getConf().setInt("hbase.regionservers", Integer.parseInt(val));
LOG.debug("localRegionServers set to " + val);
}
// How many masters to startup inside this process; useful testing
if (cmd.hasOption("masters")) {
String val = cmd.getOptionValue("masters");
getConf().setInt("hbase.masters", Integer.parseInt(val));
LOG.debug("masters set to " + val);
}
// Checking whether to shut down cluster or not
if (cmd.hasOption("shutDownCluster")) {
shutDownCluster = true;
}
@SuppressWarnings("unchecked")
List remainingArgs = cmd.getArgList();
if (remainingArgs.size() != 1) {
usage(null);
return 1;
}
String command = remainingArgs.get(0);
if ("start".equals(command)) {
return startMaster();
} else if ("stop".equals(command)) {
if (shutDownCluster) {
return stopMaster();
}
System.err.println("To shutdown the master run "
+ "hbase-daemon.sh stop master or send a kill signal to the HMaster pid, "
+ "and to stop HBase Cluster run \"stop-hbase.sh\" or \"hbase master "
+ "stop --shutDownCluster\"");
return 1;
} else if ("clear".equals(command)) {
return (ZNodeClearer.clear(getConf()) ? 0 : 1);
} else {
usage("Invalid command: " + command);
return 1;
}
}
private int startMaster() {
Configuration conf = getConf();
TraceUtil.initTracer(conf);
try {
// If 'local', defer to LocalHBaseCluster instance. Starts master
// and regionserver both in the one JVM.
if (LocalHBaseCluster.isLocal(conf)) {
DefaultMetricsSystem.setMiniClusterMode(true);
final MiniZooKeeperCluster zooKeeperCluster = new MiniZooKeeperCluster(conf);
File zkDataPath = new File(conf.get(HConstants.ZOOKEEPER_DATA_DIR));
// find out the default client port
int zkClientPort = 0;
// If the zookeeper client port is specified in server quorum, use it.
String zkserver = conf.get(HConstants.ZOOKEEPER_QUORUM);
if (zkserver != null) {
String[] zkservers = zkserver.split(",");
if (zkservers.length > 1) {
// In local mode deployment, we have the master + a region server and zookeeper server
// started in the same process. Therefore, we only support one zookeeper server.
String errorMsg = "Could not start ZK with " + zkservers.length
+ " ZK servers in local mode deployment. Aborting as clients (e.g. shell) will not "
+ "be able to find this ZK quorum.";
System.err.println(errorMsg);
throw new IOException(errorMsg);
}
String[] parts = zkservers[0].split(":");
if (parts.length == 2) {
// the second part is the client port
zkClientPort = Integer.parseInt(parts[1]);
}
}
// If the client port could not be find in server quorum conf, try another conf
if (zkClientPort == 0) {
zkClientPort = conf.getInt(HConstants.ZOOKEEPER_CLIENT_PORT, 0);
// The client port has to be set by now; if not, throw exception.
if (zkClientPort == 0) {
throw new IOException("No config value for " + HConstants.ZOOKEEPER_CLIENT_PORT);
}
}
zooKeeperCluster.setDefaultClientPort(zkClientPort);
// set the ZK tick time if specified
int zkTickTime = conf.getInt(HConstants.ZOOKEEPER_TICK_TIME, 0);
if (zkTickTime > 0) {
zooKeeperCluster.setTickTime(zkTickTime);
}
// login the zookeeper server principal (if using security)
ZKAuthentication.loginServer(conf, HConstants.ZK_SERVER_KEYTAB_FILE,
HConstants.ZK_SERVER_KERBEROS_PRINCIPAL, null);
int localZKClusterSessionTimeout =
conf.getInt(HConstants.ZK_SESSION_TIMEOUT + ".localHBaseCluster", 10 * 1000);
conf.setInt(HConstants.ZK_SESSION_TIMEOUT, localZKClusterSessionTimeout);
LOG.info("Starting a zookeeper cluster");
int clientPort = zooKeeperCluster.startup(zkDataPath);
if (clientPort != zkClientPort) {
String errorMsg = "Could not start ZK at requested port of " + zkClientPort
+ ". ZK was started at port: " + clientPort
+ ". Aborting as clients (e.g. shell) will not be able to find " + "this ZK quorum.";
System.err.println(errorMsg);
throw new IOException(errorMsg);
}
conf.set(HConstants.ZOOKEEPER_CLIENT_PORT, Integer.toString(clientPort));
// Need to have the zk cluster shutdown when master is shutdown.
// Run a subclass that does the zk cluster shutdown on its way out.
int mastersCount = conf.getInt("hbase.masters", 1);
int regionServersCount = conf.getInt("hbase.regionservers", 1);
// Set start timeout to 5 minutes for cmd line start operations
conf.setIfUnset("hbase.master.start.timeout.localHBaseCluster", "300000");
LOG.info("Starting up instance of localHBaseCluster; master=" + mastersCount
+ ", regionserversCount=" + regionServersCount);
LocalHBaseCluster cluster = new LocalHBaseCluster(conf, mastersCount, regionServersCount,
LocalHMaster.class, HRegionServer.class);
((LocalHMaster) cluster.getMaster(0)).setZKCluster(zooKeeperCluster);
cluster.startup();
waitOnMasterThreads(cluster);
} else {
logProcessInfo(getConf());
HMaster master = HMaster.constructMaster(masterClass, conf);
if (master.isStopped()) {
LOG.info("Won't bring the Master up as a shutdown is requested");
return 1;
}
master.start();
master.join();
if (master.isAborted()) throw new RuntimeException("HMaster Aborted");
}
} catch (Throwable t) {
LOG.error("Master exiting", t);
return 1;
}
return 0;
}
@SuppressWarnings("resource")
private int stopMaster() {
Configuration conf = getConf();
// Don't try more than once
conf.setInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER, 0);
try (Connection connection = ConnectionFactory.createConnection(conf)) {
try (Admin admin = connection.getAdmin()) {
admin.shutdown();
} catch (Throwable t) {
LOG.error("Failed to stop master", t);
return 1;
}
} catch (MasterNotRunningException e) {
LOG.error("Master not running");
return 1;
} catch (ZooKeeperConnectionException e) {
LOG.error("ZooKeeper not available");
return 1;
} catch (IOException e) {
LOG.error("Got IOException: " + e.getMessage(), e);
return 1;
}
return 0;
}
private void waitOnMasterThreads(LocalHBaseCluster cluster) throws InterruptedException {
List masters = cluster.getMasters();
List regionservers = cluster.getRegionServers();
if (masters != null) {
for (JVMClusterUtil.MasterThread t : masters) {
t.join();
if (t.getMaster().isAborted()) {
closeAllRegionServerThreads(regionservers);
throw new RuntimeException("HMaster Aborted");
}
}
}
}
private static void
closeAllRegionServerThreads(List regionservers) {
for (JVMClusterUtil.RegionServerThread t : regionservers) {
t.getRegionServer().stop("HMaster Aborted; Bringing down regions servers");
}
}
/*
* Version of master that will shutdown the passed zk cluster on its way out.
*/
public static class LocalHMaster extends HMaster {
private MiniZooKeeperCluster zkcluster = null;
public LocalHMaster(Configuration conf)
throws IOException, KeeperException, InterruptedException {
super(conf);
}
@Override
public void run() {
super.run();
if (this.zkcluster != null) {
try {
this.zkcluster.shutdown();
} catch (IOException e) {
e.printStackTrace();
}
}
}
void setZKCluster(final MiniZooKeeperCluster zkcluster) {
this.zkcluster = zkcluster;
}
}
}