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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.util;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hbase.master.HMaster;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.hadoop.hbase.regionserver.ShutdownHook;
import org.apache.hadoop.util.ReflectionUtils;
/**
* Utility used running a cluster all in the one JVM.
*/
@InterfaceAudience.Private
public class JVMClusterUtil {
private static final Log LOG = LogFactory.getLog(JVMClusterUtil.class);
/**
* Datastructure to hold RegionServer Thread and RegionServer instance
*/
public static class RegionServerThread extends Thread {
private final HRegionServer regionServer;
public RegionServerThread(final HRegionServer r, final int index) {
super(r, "RS:" + index + ";" + r.getServerName().toShortString());
this.regionServer = r;
}
/** @return the region server */
public HRegionServer getRegionServer() {
return this.regionServer;
}
/**
* Block until the region server has come online, indicating it is ready
* to be used.
*/
public void waitForServerOnline() {
// The server is marked online after the init method completes inside of
// the HRS#run method. HRS#init can fail for whatever region. In those
// cases, we'll jump out of the run without setting online flag. Check
// stopRequested so we don't wait here a flag that will never be flipped.
regionServer.waitForServerOnline();
}
}
/**
* Creates a {@link RegionServerThread}.
* Call 'start' on the returned thread to make it run.
* @param c Configuration to use.
* @param hrsc Class to create.
* @param index Used distinguishing the object returned.
* @throws IOException
* @return Region server added.
*/
public static JVMClusterUtil.RegionServerThread createRegionServerThread(
final Configuration c, final Class hrsc,
final int index)
throws IOException {
HRegionServer server;
try {
Constructor ctor = hrsc.getConstructor(Configuration.class);
ctor.setAccessible(true);
server = ctor.newInstance(c);
} catch (InvocationTargetException ite) {
Throwable target = ite.getTargetException();
throw new RuntimeException("Failed construction of RegionServer: " +
hrsc.toString() + ((target.getCause() != null)?
target.getCause().getMessage(): ""), target);
} catch (Exception e) {
IOException ioe = new IOException();
ioe.initCause(e);
throw ioe;
}
return new JVMClusterUtil.RegionServerThread(server, index);
}
/**
* Datastructure to hold Master Thread and Master instance
*/
public static class MasterThread extends Thread {
private final HMaster master;
public MasterThread(final HMaster m, final int index) {
super(m, "M:" + index + ";" + m.getServerName().toShortString());
this.master = m;
}
/** @return the master */
public HMaster getMaster() {
return this.master;
}
}
/**
* Creates a {@link MasterThread}.
* Call 'start' on the returned thread to make it run.
* @param c Configuration to use.
* @param hmc Class to create.
* @param index Used distinguishing the object returned.
* @throws IOException
* @return Master added.
*/
public static JVMClusterUtil.MasterThread createMasterThread(
final Configuration c, final Class hmc,
final int index)
throws IOException {
HMaster server;
try {
server = hmc.getConstructor(Configuration.class).newInstance(c);
} catch (InvocationTargetException ite) {
Throwable target = ite.getTargetException();
throw new RuntimeException("Failed construction of Master: " +
hmc.toString() + ((target.getCause() != null)?
target.getCause().getMessage(): ""), target);
} catch (Exception e) {
IOException ioe = new IOException();
ioe.initCause(e);
throw ioe;
}
return new JVMClusterUtil.MasterThread(server, index);
}
private static JVMClusterUtil.MasterThread findActiveMaster(
List masters) {
for (JVMClusterUtil.MasterThread t : masters) {
if (t.master.isActiveMaster()) {
return t;
}
}
return null;
}
/**
* Start the cluster. Waits until there is a primary master initialized
* and returns its address.
* @param masters
* @param regionservers
* @return Address to use contacting primary master.
*/
public static String startup(final List masters,
final List regionservers) throws IOException {
if (masters == null || masters.isEmpty()) {
return null;
}
for (JVMClusterUtil.MasterThread t : masters) {
t.start();
}
// Wait for an active master
// having an active master before starting the region threads allows
// then to succeed on their connection to master
long startTime = System.currentTimeMillis();
while (findActiveMaster(masters) == null) {
try {
Thread.sleep(100);
} catch (InterruptedException ignored) {
}
if (System.currentTimeMillis() > startTime + 30000) {
throw new RuntimeException("Master not active after 30 seconds");
}
}
if (regionservers != null) {
for (JVMClusterUtil.RegionServerThread t: regionservers) {
HRegionServer hrs = t.getRegionServer();
ShutdownHook.install(hrs.getConfiguration(), FileSystem.get(hrs
.getConfiguration()), hrs, t);
t.start();
}
}
// Wait for an active master to be initialized (implies being master)
// with this, when we return the cluster is complete
startTime = System.currentTimeMillis();
final int maxwait = 200000;
while (true) {
JVMClusterUtil.MasterThread t = findActiveMaster(masters);
if (t != null && t.master.isInitialized()) {
return t.master.getServerName().toString();
}
// REMOVE
if (System.currentTimeMillis() > startTime + 10000) {
Threads.sleep(1000);
}
if (System.currentTimeMillis() > startTime + maxwait) {
String msg = "Master not initialized after " + maxwait + "ms seconds";
Threads.printThreadInfo(System.out,
"Thread dump because: " + msg);
throw new RuntimeException(msg);
}
try {
Thread.sleep(100);
} catch (InterruptedException ignored) {
// Keep waiting
}
}
}
/**
* @param masters
* @param regionservers
*/
public static void shutdown(final List masters,
final List regionservers) {
LOG.debug("Shutting down HBase Cluster");
if (masters != null) {
// Do backups first.
JVMClusterUtil.MasterThread activeMaster = null;
for (JVMClusterUtil.MasterThread t : masters) {
if (!t.master.isActiveMaster()) {
t.master.stopMaster();
} else {
activeMaster = t;
}
}
// Do active after.
if (activeMaster != null)
activeMaster.master.shutdown();
}
boolean wasInterrupted = false;
final long maxTime = System.currentTimeMillis() + 30 * 1000;
if (regionservers != null) {
// first try nicely.
for (RegionServerThread t : regionservers) {
t.getRegionServer().stop("Shutdown requested");
}
for (RegionServerThread t : regionservers) {
long now = System.currentTimeMillis();
if (t.isAlive() && !wasInterrupted && now < maxTime) {
try {
t.join(maxTime - now);
} catch (InterruptedException e) {
LOG.info("Got InterruptedException on shutdown - " +
"not waiting anymore on region server ends", e);
wasInterrupted = true; // someone wants us to speed up.
}
}
}
// Let's try to interrupt the remaining threads if any.
for (int i = 0; i < 100; ++i) {
boolean atLeastOneLiveServer = false;
for (RegionServerThread t : regionservers) {
if (t.isAlive()) {
atLeastOneLiveServer = true;
try {
LOG.warn("RegionServerThreads remaining, give one more chance before interrupting");
t.join(1000);
} catch (InterruptedException e) {
wasInterrupted = true;
}
}
}
if (!atLeastOneLiveServer) break;
for (RegionServerThread t : regionservers) {
if (t.isAlive()) {
LOG.warn("RegionServerThreads taking too long to stop, interrupting");
t.interrupt();
}
}
}
}
if (masters != null) {
for (JVMClusterUtil.MasterThread t : masters) {
while (t.master.isAlive() && !wasInterrupted) {
try {
// The below has been replaced to debug sometime hangs on end of
// tests.
// this.master.join():
Threads.threadDumpingIsAlive(t.master.getThread());
} catch(InterruptedException e) {
LOG.info("Got InterruptedException on shutdown - " +
"not waiting anymore on master ends", e);
wasInterrupted = true;
}
}
}
}
LOG.info("Shutdown of " +
((masters != null) ? masters.size() : "0") + " master(s) and " +
((regionservers != null) ? regionservers.size() : "0") +
" regionserver(s) " + (wasInterrupted ? "interrupted" : "complete"));
if (wasInterrupted){
Thread.currentThread().interrupt();
}
}
}