/**
*
* 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.bookkeeper.replication;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import org.junit.Assert;
import org.apache.bookkeeper.conf.ServerConfiguration;
import org.apache.bookkeeper.proto.BookieServer;
import org.apache.bookkeeper.test.BookKeeperClusterTestCase;
import org.apache.bookkeeper.zookeeper.ZooKeeperClient;
import org.apache.zookeeper.ZooKeeper;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.junit.Assert.*;
/**
* This test verifies the auditor bookie scenarios which will be monitoring the
* bookie failures
*/
public class AuditorBookieTest extends BookKeeperClusterTestCase {
// Depending on the taste, select the amount of logging
// by decommenting one of the two lines below
// private final static Logger LOG = Logger.getRootLogger();
private final static Logger LOG = LoggerFactory
.getLogger(AuditorBookieTest.class);
private String electionPath;
private HashMap<String, AuditorElector> auditorElectors = new HashMap<String, AuditorElector>();
private List<ZooKeeper> zkClients = new LinkedList<ZooKeeper>();
public AuditorBookieTest() {
super(6);
electionPath = baseConf.getZkLedgersRootPath()
+ "/underreplication/auditorelection";
}
@Override
public void setUp() throws Exception {
super.setUp();
startAuditorElectors();
}
@Override
public void tearDown() throws Exception {
stopAuditorElectors();
for (ZooKeeper zk : zkClients) {
zk.close();
}
zkClients.clear();
super.tearDown();
}
/**
* Test should ensure only one should act as Auditor. Starting/shutdown
* other than auditor bookie shouldn't initiate re-election and multiple
* auditors.
*/
@Test(timeout=60000)
public void testEnsureOnlySingleAuditor() throws Exception {
BookieServer auditor = verifyAuditor();
// shutdown bookie which is not an auditor
int indexOf = bs.indexOf(auditor);
int bkIndexDownBookie;
if (indexOf < bs.size() - 1) {
bkIndexDownBookie = indexOf + 1;
} else {
bkIndexDownBookie = indexOf - 1;
}
shutdownBookie(bs.get(bkIndexDownBookie));
startNewBookie();
startNewBookie();
// grace period for the auditor re-election if any
BookieServer newAuditor = waitForNewAuditor(auditor);
Assert.assertSame(
"Auditor re-election is not happened for auditor failure!",
auditor, newAuditor);
}
/**
* Test Auditor crashes should trigger re-election and another bookie should
* take over the auditor ship
*/
@Test(timeout=60000)
public void testSuccessiveAuditorCrashes() throws Exception {
BookieServer auditor = verifyAuditor();
shutdownBookie(auditor);
BookieServer newAuditor1 = waitForNewAuditor(auditor);
bs.remove(auditor);
shutdownBookie(newAuditor1);
BookieServer newAuditor2 = waitForNewAuditor(newAuditor1);
Assert.assertNotSame(
"Auditor re-election is not happened for auditor failure!",
auditor, newAuditor2);
bs.remove(newAuditor1);
}
/**
* Test restarting the entire bookie cluster. It shouldn't create multiple
* bookie auditors
*/
@Test(timeout=60000)
public void testBookieClusterRestart() throws Exception {
BookieServer auditor = verifyAuditor();
for (AuditorElector auditorElector : auditorElectors.values()) {
assertTrue("Auditor elector is not running!", auditorElector
.isRunning());
}
stopBKCluster();
stopAuditorElectors();
startBKCluster();
startAuditorElectors();
BookieServer newAuditor = waitForNewAuditor(auditor);
Assert.assertNotSame(
"Auditor re-election is not happened for auditor failure!",
auditor, newAuditor);
}
/**
* Test the vote is deleting from the ZooKeeper during shutdown.
*/
@Test(timeout=60000)
public void testShutdown() throws Exception {
BookieServer auditor = verifyAuditor();
shutdownBookie(auditor);
// waiting for new auditor
BookieServer newAuditor = waitForNewAuditor(auditor);
Assert.assertNotSame(
"Auditor re-election is not happened for auditor failure!",
auditor, newAuditor);
int indexOfDownBookie = bs.indexOf(auditor);
bs.remove(indexOfDownBookie);
bsConfs.remove(indexOfDownBookie);
List<String> children = zkc.getChildren(electionPath, false);
for (String child : children) {
byte[] data = zkc.getData(electionPath + '/' + child, false, null);
String bookieIP = new String(data);
String addr = auditor.getLocalAddress().toString();
Assert.assertFalse("AuditorElection cleanup fails", bookieIP
.contains(addr));
}
}
/**
* Test restart of the previous Auditor bookie shouldn't initiate
* re-election and should create new vote after restarting.
*/
@Test(timeout=60000)
public void testRestartAuditorBookieAfterCrashing() throws Exception {
BookieServer auditor = verifyAuditor();
shutdownBookie(auditor);
String addr = auditor.getLocalAddress().toString();
// restarting Bookie with same configurations.
int indexOfDownBookie = bs.indexOf(auditor);
ServerConfiguration serverConfiguration = bsConfs
.get(indexOfDownBookie);
bs.remove(indexOfDownBookie);
bsConfs.remove(indexOfDownBookie);
auditorElectors.remove(addr);
startBookie(serverConfiguration);
// starting corresponding auditor elector
LOG.debug("Performing Auditor Election:" + addr);
startAuditorElector(addr);
// waiting for new auditor to come
BookieServer newAuditor = waitForNewAuditor(auditor);
Assert.assertNotSame(
"Auditor re-election is not happened for auditor failure!",
auditor, newAuditor);
Assert.assertFalse("No relection after old auditor rejoins", auditor
.getLocalAddress().getPort() == newAuditor.getLocalAddress()
.getPort());
}
private void startAuditorElector(String addr) throws Exception {
ZooKeeper zk = ZooKeeperClient.newBuilder()
.connectString(zkUtil.getZooKeeperConnectString())
.sessionTimeoutMs(10000)
.build();
zkClients.add(zk);
AuditorElector auditorElector = new AuditorElector(addr,
baseConf, zk);
auditorElectors.put(addr, auditorElector);
auditorElector.start();
LOG.debug("Starting Auditor Elector");
}
private void startAuditorElectors() throws Exception {
for (BookieServer bserver : bs) {
String addr = bserver.getLocalAddress().toString();
startAuditorElector(addr);
}
}
private void stopAuditorElectors() throws Exception {
for (AuditorElector auditorElector : auditorElectors.values()) {
auditorElector.shutdown();
LOG.debug("Stopping Auditor Elector!");
}
}
private BookieServer verifyAuditor() throws Exception {
List<BookieServer> auditors = getAuditorBookie();
Assert.assertEquals("Multiple Bookies acting as Auditor!", 1, auditors
.size());
LOG.debug("Bookie running as Auditor:" + auditors.get(0));
return auditors.get(0);
}
private List<BookieServer> getAuditorBookie() throws Exception {
List<BookieServer> auditors = new LinkedList<BookieServer>();
byte[] data = zkc.getData(electionPath, false, null);
Assert.assertNotNull("Auditor election failed", data);
for (BookieServer bks : bs) {
if (new String(data).contains(bks.getLocalAddress().getPort() + "")) {
auditors.add(bks);
}
}
return auditors;
}
private void shutdownBookie(BookieServer bkServer) throws Exception {
String addr = bkServer.getLocalAddress().toString();
LOG.debug("Shutting down bookie:" + addr);
// shutdown bookie which is an auditor
bkServer.shutdown();
// stopping corresponding auditor elector
auditorElectors.get(addr).shutdown();
}
private BookieServer waitForNewAuditor(BookieServer auditor)
throws Exception {
BookieServer newAuditor = null;
int retryCount = 8;
while (retryCount > 0) {
List<BookieServer> auditors = getAuditorBookie();
if (auditors.size() > 0) {
newAuditor = auditors.get(0);
if (auditor != newAuditor) {
break;
}
}
Thread.sleep(500);
retryCount--;
}
Assert.assertNotNull(
"New Auditor is not reelected after auditor crashes",
newAuditor);
verifyAuditor();
return newAuditor;
}
}