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* Licensed to the Apache Software Foundation (ASF) under one
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase;
import java.io.IOException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.apache.hadoop.conf.Configuration;
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.client.TableDescriptor;
import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
import org.apache.hadoop.hbase.master.HMaster;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.hadoop.hbase.security.User;
import org.apache.hadoop.hbase.util.JVMClusterUtil;
import org.apache.hadoop.hbase.util.JVMClusterUtil.RegionServerThread;
import org.apache.hadoop.hbase.util.Threads;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class creates a single process HBase cluster. One thread is created for a master and one per
* region server. Call {@link #startup()} to start the cluster running and {@link #shutdown()} to
* close it all down. {@link #join} the cluster is you want to wait on shutdown completion.
*
* Runs master on port 16000 by default. Because we can't just kill the process -- not till
* HADOOP-1700 gets fixed and even then.... -- we need to be able to find the master with a remote
* client to run shutdown. To use a port other than 16000, set the hbase.master to a value of
* 'local:PORT': that is 'local', not 'localhost', and the port number the master should use instead
* of 16000.
*/
@InterfaceAudience.Private
public class LocalHBaseCluster {
private static final Logger LOG = LoggerFactory.getLogger(LocalHBaseCluster.class);
private final List masterThreads = new CopyOnWriteArrayList<>();
private final List regionThreads =
new CopyOnWriteArrayList<>();
private final static int DEFAULT_NO = 1;
/** local mode */
public static final String LOCAL = "local";
/** 'local:' */
public static final String LOCAL_COLON = LOCAL + ":";
public static final String ASSIGN_RANDOM_PORTS = "hbase.localcluster.assign.random.ports";
private final Configuration conf;
private final Class masterClass;
private final Class regionServerClass;
/**
* Constructor.
*/
public LocalHBaseCluster(final Configuration conf) throws IOException {
this(conf, DEFAULT_NO);
}
/**
* Constructor.
* @param conf Configuration to use. Post construction has the master's address.
* @param noRegionServers Count of regionservers to start.
*/
public LocalHBaseCluster(final Configuration conf, final int noRegionServers) throws IOException {
this(conf, 1, 0, noRegionServers, getMasterImplementation(conf),
getRegionServerImplementation(conf));
}
/**
* Constructor.
* @param conf Configuration to use. Post construction has the active master address.
* @param noMasters Count of masters to start.
* @param noRegionServers Count of regionservers to start.
*/
public LocalHBaseCluster(final Configuration conf, final int noMasters, final int noRegionServers)
throws IOException {
this(conf, noMasters, 0, noRegionServers, getMasterImplementation(conf),
getRegionServerImplementation(conf));
}
@SuppressWarnings("unchecked")
private static Class
getRegionServerImplementation(final Configuration conf) {
return (Class) conf.getClass(HConstants.REGION_SERVER_IMPL,
HRegionServer.class);
}
@SuppressWarnings("unchecked")
private static Class getMasterImplementation(final Configuration conf) {
return (Class) conf.getClass(HConstants.MASTER_IMPL, HMaster.class);
}
public LocalHBaseCluster(final Configuration conf, final int noMasters, final int noRegionServers,
final Class masterClass,
final Class regionServerClass) throws IOException {
this(conf, noMasters, 0, noRegionServers, masterClass, regionServerClass);
}
/**
* Constructor.
* @param conf Configuration to use. Post construction has the master's address.
* @param noMasters Count of masters to start.
* @param noRegionServers Count of regionservers to start.
*/
@SuppressWarnings("unchecked")
public LocalHBaseCluster(final Configuration conf, final int noMasters,
final int noAlwaysStandByMasters, final int noRegionServers,
final Class masterClass,
final Class regionServerClass) throws IOException {
this.conf = conf;
// When active, if a port selection is default then we switch to random
if (conf.getBoolean(ASSIGN_RANDOM_PORTS, false)) {
if (
conf.getInt(HConstants.MASTER_PORT, HConstants.DEFAULT_MASTER_PORT)
== HConstants.DEFAULT_MASTER_PORT
) {
LOG.debug("Setting Master Port to random.");
conf.set(HConstants.MASTER_PORT, "0");
}
if (
conf.getInt(HConstants.REGIONSERVER_PORT, HConstants.DEFAULT_REGIONSERVER_PORT)
== HConstants.DEFAULT_REGIONSERVER_PORT
) {
LOG.debug("Setting RegionServer Port to random.");
conf.set(HConstants.REGIONSERVER_PORT, "0");
}
// treat info ports special; expressly don't change '-1' (keep off)
// in case we make that the default behavior.
if (
conf.getInt(HConstants.REGIONSERVER_INFO_PORT, 0) != -1
&& conf.getInt(HConstants.REGIONSERVER_INFO_PORT,
HConstants.DEFAULT_REGIONSERVER_INFOPORT) == HConstants.DEFAULT_REGIONSERVER_INFOPORT
) {
LOG.debug("Setting RS InfoServer Port to random.");
conf.set(HConstants.REGIONSERVER_INFO_PORT, "0");
}
if (
conf.getInt(HConstants.MASTER_INFO_PORT, 0) != -1
&& conf.getInt(HConstants.MASTER_INFO_PORT, HConstants.DEFAULT_MASTER_INFOPORT)
== HConstants.DEFAULT_MASTER_INFOPORT
) {
LOG.debug("Setting Master InfoServer Port to random.");
conf.set(HConstants.MASTER_INFO_PORT, "0");
}
}
this.masterClass =
(Class) conf.getClass(HConstants.MASTER_IMPL, masterClass);
// Start the HMasters.
int i;
for (i = 0; i < noMasters; i++) {
addMaster(new Configuration(conf), i);
}
for (int j = 0; j < noAlwaysStandByMasters; j++) {
Configuration c = new Configuration(conf);
c.set(HConstants.MASTER_IMPL, "org.apache.hadoop.hbase.master.AlwaysStandByHMaster");
addMaster(c, i + j);
}
// Start the HRegionServers.
this.regionServerClass = (Class) conf
.getClass(HConstants.REGION_SERVER_IMPL, regionServerClass);
for (int j = 0; j < noRegionServers; j++) {
addRegionServer(new Configuration(conf), j);
}
}
public JVMClusterUtil.RegionServerThread addRegionServer() throws IOException {
return addRegionServer(new Configuration(conf), this.regionThreads.size());
}
@SuppressWarnings("unchecked")
public JVMClusterUtil.RegionServerThread addRegionServer(Configuration config, final int index)
throws IOException {
// Create each regionserver with its own Configuration instance so each has
// its Connection instance rather than share (see HBASE_INSTANCES down in
// the guts of ConnectionManager).
JVMClusterUtil.RegionServerThread rst =
JVMClusterUtil.createRegionServerThread(config, (Class) conf
.getClass(HConstants.REGION_SERVER_IMPL, this.regionServerClass), index);
this.regionThreads.add(rst);
return rst;
}
public JVMClusterUtil.RegionServerThread addRegionServer(final Configuration config,
final int index, User user) throws IOException, InterruptedException {
return user.runAs(new PrivilegedExceptionAction() {
@Override
public JVMClusterUtil.RegionServerThread run() throws Exception {
return addRegionServer(config, index);
}
});
}
public JVMClusterUtil.MasterThread addMaster() throws IOException {
return addMaster(new Configuration(conf), this.masterThreads.size());
}
public JVMClusterUtil.MasterThread addMaster(Configuration c, final int index)
throws IOException {
// Create each master with its own Configuration instance so each has
// its Connection instance rather than share (see HBASE_INSTANCES down in
// the guts of ConnectionManager.
JVMClusterUtil.MasterThread mt = JVMClusterUtil.createMasterThread(c,
(Class) c.getClass(HConstants.MASTER_IMPL, this.masterClass), index);
this.masterThreads.add(mt);
// Refresh the master address config.
List masterHostPorts = new ArrayList<>();
getMasters().forEach(masterThread -> masterHostPorts
.add(masterThread.getMaster().getServerName().getAddress().toString()));
conf.set(HConstants.MASTER_ADDRS_KEY, String.join(",", masterHostPorts));
return mt;
}
public JVMClusterUtil.MasterThread addMaster(final Configuration c, final int index, User user)
throws IOException, InterruptedException {
return user.runAs(new PrivilegedExceptionAction() {
@Override
public JVMClusterUtil.MasterThread run() throws Exception {
return addMaster(c, index);
}
});
}
/** Returns region server */
public HRegionServer getRegionServer(int serverNumber) {
return regionThreads.get(serverNumber).getRegionServer();
}
/** Returns Read-only list of region server threads. */
public List getRegionServers() {
return Collections.unmodifiableList(this.regionThreads);
}
/**
* @return List of running servers (Some servers may have been killed or aborted during lifetime
* of cluster; these servers are not included in this list).
*/
public List getLiveRegionServers() {
List liveServers = new ArrayList<>();
List list = getRegionServers();
for (JVMClusterUtil.RegionServerThread rst : list) {
if (rst.isAlive()) liveServers.add(rst);
else LOG.info("Not alive " + rst.getName());
}
return liveServers;
}
/** Returns the Configuration used by this LocalHBaseCluster */
public Configuration getConfiguration() {
return this.conf;
}
/**
* Wait for the specified region server to stop. Removes this thread from list of running threads.
* @return Name of region server that just went down.
*/
public String waitOnRegionServer(int serverNumber) {
JVMClusterUtil.RegionServerThread regionServerThread = this.regionThreads.get(serverNumber);
return waitOnRegionServer(regionServerThread);
}
/**
* Wait for the specified region server to stop. Removes this thread from list of running threads.
* @return Name of region server that just went down.
*/
public String waitOnRegionServer(JVMClusterUtil.RegionServerThread rst) {
boolean interrupted = false;
while (rst.isAlive()) {
try {
LOG.info("Waiting on " + rst.getRegionServer().toString());
rst.join();
} catch (InterruptedException e) {
LOG.error("Interrupted while waiting for {} to finish. Retrying join", rst.getName(), e);
interrupted = true;
}
}
regionThreads.remove(rst);
if (interrupted) {
Thread.currentThread().interrupt();
}
return rst.getName();
}
/** Returns the HMaster thread */
public HMaster getMaster(int serverNumber) {
return masterThreads.get(serverNumber).getMaster();
}
/**
* Gets the current active master, if available. If no active master, returns null.
* @return the HMaster for the active master
*/
public HMaster getActiveMaster() {
for (JVMClusterUtil.MasterThread mt : masterThreads) {
// Ensure that the current active master is not stopped.
// We don't want to return a stopping master as an active master.
if (mt.getMaster().isActiveMaster() && !mt.getMaster().isStopped()) {
return mt.getMaster();
}
}
return null;
}
/** Returns Read-only list of master threads. */
public List getMasters() {
return Collections.unmodifiableList(this.masterThreads);
}
/**
* @return List of running master servers (Some servers may have been killed or aborted during
* lifetime of cluster; these servers are not included in this list).
*/
public List getLiveMasters() {
List liveServers = new ArrayList<>();
List list = getMasters();
for (JVMClusterUtil.MasterThread mt : list) {
if (mt.isAlive()) {
liveServers.add(mt);
}
}
return liveServers;
}
/**
* Wait for the specified master to stop. Removes this thread from list of running threads.
* @return Name of master that just went down.
*/
public String waitOnMaster(int serverNumber) {
JVMClusterUtil.MasterThread masterThread = this.masterThreads.get(serverNumber);
return waitOnMaster(masterThread);
}
/**
* Wait for the specified master to stop. Removes this thread from list of running threads.
* @return Name of master that just went down.
*/
public String waitOnMaster(JVMClusterUtil.MasterThread masterThread) {
boolean interrupted = false;
while (masterThread.isAlive()) {
try {
LOG.info("Waiting on " + masterThread.getMaster().getServerName().toString());
masterThread.join();
} catch (InterruptedException e) {
LOG.error("Interrupted while waiting for {} to finish. Retrying join",
masterThread.getName(), e);
interrupted = true;
}
}
masterThreads.remove(masterThread);
if (interrupted) {
Thread.currentThread().interrupt();
}
return masterThread.getName();
}
/**
* Wait for Mini HBase Cluster to shut down. Presumes you've already called {@link #shutdown()}.
*/
public void join() {
if (this.regionThreads != null) {
for (Thread t : this.regionThreads) {
if (t.isAlive()) {
try {
Threads.threadDumpingIsAlive(t);
} catch (InterruptedException e) {
LOG.debug("Interrupted", e);
}
}
}
}
if (this.masterThreads != null) {
for (Thread t : this.masterThreads) {
if (t.isAlive()) {
try {
Threads.threadDumpingIsAlive(t);
} catch (InterruptedException e) {
LOG.debug("Interrupted", e);
}
}
}
}
}
/**
* Start the cluster.
*/
public void startup() throws IOException {
JVMClusterUtil.startup(this.masterThreads, this.regionThreads);
}
/**
* Shut down the mini HBase cluster
*/
public void shutdown() {
JVMClusterUtil.shutdown(this.masterThreads, this.regionThreads);
}
/**
* @param c Configuration to check.
* @return True if a 'local' address in hbase.master value.
*/
public static boolean isLocal(final Configuration c) {
boolean mode =
c.getBoolean(HConstants.CLUSTER_DISTRIBUTED, HConstants.DEFAULT_CLUSTER_DISTRIBUTED);
return (mode == HConstants.CLUSTER_IS_LOCAL);
}
/**
* Test things basically work.
*/
public static void main(String[] args) throws IOException {
Configuration conf = HBaseConfiguration.create();
LocalHBaseCluster cluster = new LocalHBaseCluster(conf);
cluster.startup();
try (Connection connection = ConnectionFactory.createConnection(conf);
Admin admin = connection.getAdmin()) {
TableDescriptor htd =
TableDescriptorBuilder.newBuilder(TableName.valueOf(cluster.getClass().getName())).build();
admin.createTable(htd);
} finally {
cluster.shutdown();
}
}
}