/*
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* The contents of this file are subject to the terms of the Common Development and
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* Distribution License (the License). You may not use this file except in compliance with the
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* License.
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*
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* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
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* specific language governing permission and limitations under the License.
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*
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* When distributing Covered Software, include this CDDL Header Notice in each file and include
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* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
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* Header, with the fields enclosed by brackets [] replaced by your own identifying
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* information: "Portions Copyright [year] [name of copyright owner]".
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*
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* Copyright 2009-2010 Sun Microsystems, Inc.
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* Portions Copyright 2011-2016 ForgeRock AS.
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* Portions Copyright 2026 3A Systems, LLC
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*/
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package org.opends.server.replication.plugin;
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import static java.util.concurrent.TimeUnit.*;
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import static org.mockito.Mockito.*;
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import static org.opends.server.util.CollectionUtils.*;
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import static org.testng.Assert.*;
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import java.io.IOException;
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import java.net.SocketTimeoutException;
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import java.util.SortedSet;
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import java.util.TreeSet;
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import java.util.concurrent.atomic.AtomicBoolean;
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import org.forgerock.i18n.LocalizableMessage;
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import org.forgerock.i18n.slf4j.LocalizedLogger;
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import org.forgerock.opendj.config.server.ConfigurationChangeListener;
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import org.forgerock.opendj.ldap.DN;
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import org.forgerock.opendj.server.config.server.ReplicationSynchronizationProviderCfg;
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import org.forgerock.opendj.server.config.server.SynchronizationProviderCfg;
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import org.opends.server.TestCaseUtils;
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import org.opends.server.api.SynchronizationProvider;
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import org.opends.server.core.DirectoryServer;
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import org.opends.server.replication.ReplicationTestCase;
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import org.opends.server.replication.common.CSNGenerator;
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import org.opends.server.replication.common.DSInfo;
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import org.opends.server.replication.common.ServerState;
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import org.opends.server.replication.common.ServerStatus;
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import org.opends.server.replication.protocol.AddMsg;
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import org.opends.server.replication.protocol.DoneMsg;
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import org.opends.server.replication.protocol.EntryMsg;
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import org.opends.server.replication.protocol.InitializeTargetMsg;
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import org.opends.server.replication.protocol.ReplSessionSecurity;
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import org.opends.server.replication.protocol.ReplicationMsg;
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import org.opends.server.replication.protocol.ResetGenerationIdMsg;
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import org.opends.server.replication.protocol.RoutableMsg;
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import org.opends.server.replication.server.ReplServerFakeConfiguration;
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import org.opends.server.replication.server.ReplicationServer;
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import org.opends.server.replication.service.ReplicationBroker;
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import org.opends.server.types.Entry;
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import org.opends.server.util.TestTimer;
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import org.opends.server.util.TestTimer.CallableVoid;
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import org.testng.annotations.AfterClass;
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import org.testng.annotations.BeforeClass;
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import org.testng.annotations.DataProvider;
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import org.testng.annotations.Test;
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/**
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* Some tests to go through the DS state machine and validate we get the
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* expected status according to the actions we perform.
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*/
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@SuppressWarnings("javadoc")
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public class StateMachineTest extends ReplicationTestCase
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{
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/** Server id definitions. */
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private static final String EXAMPLE_DN = "dc=example,dc=com";
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private static DN EXAMPLE_DN_;
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private static final int DS1_ID = 1;
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private static final int DS2_ID = 2;
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private static final int DS3_ID = 3;
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private static final int RS1_ID = 41;
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private int rs1Port = -1;
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private LDAPReplicationDomain ds1;
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private ReplicationBroker ds2;
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private ReplicationBroker ds3;
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private ReplicationServer rs1;
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/** The tracer object for the debug logger. */
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private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
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private final int initWindow = 100;
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private void debugInfo(String s)
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{
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logger.error(LocalizableMessage.raw(s));
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if (logger.isTraceEnabled())
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{
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logger.trace("** TEST **" + s);
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}
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}
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private static void shutdown(BrokerReader reader)
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{
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if (reader != null)
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{
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reader.shutdown();
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}
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}
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private static void shutdown(BrokerWriter writer)
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{
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if (writer != null)
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{
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writer.shutdown();
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}
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}
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private void initTest() throws IOException
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{
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rs1Port = -1;
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ds1 = null;
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ds2 = null;
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ds3 = null;
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rs1Port = TestCaseUtils.findFreePort();
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}
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private void endTest() throws Exception
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{
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if (ds1 != null)
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{
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ds1.shutdown();
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ds1 = null;
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}
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// Clear any reference to a domain in synchro plugin
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MultimasterReplication.deleteDomain(EXAMPLE_DN_);
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stop(ds2, ds3);
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ds2 = ds3 = null;
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remove(rs1);
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rs1 = null;
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rs1Port = -1;
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}
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/** Waits until the provided ds is connected to the replication server. */
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private void waitUntiConnected(final int dsId) throws Exception
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{
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TestTimer timer = new TestTimer.Builder()
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.maxSleep(30, SECONDS)
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.sleepTimes(100, MILLISECONDS)
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.toTimer();
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timer.repeatUntilSuccess(new CallableVoid()
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{
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@Override
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public void call() throws Exception
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{
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assertTrue(isConnected(dsId), "checkConnection: DS " + dsId + " is not connected to the RS");
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}
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});
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}
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private boolean isConnected(final int dsId)
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{
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switch (dsId)
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{
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case DS1_ID:
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return ds1.isConnected();
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case DS2_ID:
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return ds2.isConnected();
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case DS3_ID:
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return ds3.isConnected();
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default:
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fail("Unknown ds server id.");
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return false;
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}
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}
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/** Creates a new ReplicationServer. */
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private ReplicationServer createReplicationServer(String testCase,
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int degradedStatusThreshold) throws Exception
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{
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SortedSet<String> replServers = new TreeSet<>();
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String dir = "stateMachineTest" + RS1_ID + testCase + "Db";
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ReplServerFakeConfiguration conf =
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new ReplServerFakeConfiguration(rs1Port, dir, 0, RS1_ID, 0,
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100, replServers, 1, 1000, degradedStatusThreshold);
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return new ReplicationServer(conf);
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}
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/** Creates and starts a new ReplicationDomain configured for the replication server. */
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@SuppressWarnings("unchecked")
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private LDAPReplicationDomain createReplicationDomain(int dsId) throws Exception
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{
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SortedSet<String> replServers = new TreeSet<>();
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replServers.add("localhost:" + rs1Port);
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DomainFakeCfg domainConf = new DomainFakeCfg(EXAMPLE_DN_, dsId, replServers);
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LDAPReplicationDomain replicationDomain = MultimasterReplication.createNewDomain(domainConf);
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replicationDomain.start();
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SynchronizationProvider<SynchronizationProviderCfg> provider =
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DirectoryServer.getSynchronizationProviders().get(0);
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if (provider instanceof ConfigurationChangeListener)
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{
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ConfigurationChangeListener<ReplicationSynchronizationProviderCfg> mmr =
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(ConfigurationChangeListener<ReplicationSynchronizationProviderCfg>) provider;
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// An unstubbed mock would return 0 for getNumUpdateReplayThreads()
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// (Mockito's default for Integer instead of null), silently killing the
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// replay thread pool of MultimasterReplication for the rest of the test:
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// stub it so that the default number of replay threads is used.
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ReplicationSynchronizationProviderCfg providerCfg = mock(ReplicationSynchronizationProviderCfg.class);
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when(providerCfg.getNumUpdateReplayThreads()).thenReturn(null);
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when(providerCfg.getConnectionTimeout()).thenReturn(5000L);
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mmr.applyConfigurationChange(providerCfg);
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}
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return replicationDomain;
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}
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/**
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* Create and connect a replication broker to the replication server with the
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* given state and generation id.
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*/
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private ReplicationBroker createReplicationBroker(int dsId,
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ServerState state, long generationId) throws Exception
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{
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SortedSet<String> replServers = newTreeSet("localhost:" + rs1Port);
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DomainFakeCfg fakeCfg = new DomainFakeCfg(EXAMPLE_DN_, dsId, replServers);
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fakeCfg.setHeartbeatInterval(0);
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fakeCfg.setChangetimeHeartbeatInterval(500);
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ReplSessionSecurity security = new ReplSessionSecurity(null, null, null, true);
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ReplicationBroker broker = new ReplicationBroker(
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new DummyReplicationDomain(generationId), state, fakeCfg, security);
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broker.start();
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checkConnection(30, broker);
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return broker;
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}
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/**
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* Make simple state machine test.
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*
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* NC = Not connected status
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* N = Normal status
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* D = Degraded status
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* FU = Full update status
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* BG = Bad generation id status
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*
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* The test path should be:
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* ->NC->N->NC
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* @throws Exception If a problem occurred
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*/
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@Test(enabled=true)
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public void testStateMachineBasic() throws Exception
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{
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String testCase = "testStateMachineBasic";
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debugInfo("Starting " + testCase);
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initTest();
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try
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{
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// DS1 start, no RS available: DS1 should be in not connected status
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ds1 = createReplicationDomain(DS1_ID);
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waitUntilStatusEquals(ds1, ServerStatus.NOT_CONNECTED_STATUS);
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// RS1 starts , DS1 should connect to it and be in normal status
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rs1 = createReplicationServer(testCase, 5000);
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waitUntilStatusEquals(ds1, ServerStatus.NORMAL_STATUS);
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// RS1 stops, DS1 should go in not connected status
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rs1.remove();
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waitUntilStatusEquals(ds1, ServerStatus.NOT_CONNECTED_STATUS);
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} finally
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{
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endTest();
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}
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}
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/** Returns various init values for test testStateMachineStatusAnalyzer. */
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@DataProvider(name="stateMachineStatusAnalyzerTestProvider")
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public Object [][] stateMachineStatusAnalyzerTestProvider() throws Exception
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{
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return new Object [][] { {1} , {10}, {50}, {120} };
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}
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/**
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* Test the status analyzer system that allows to go from normal to degraded
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* and vice versa, using the configured threshold value
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*
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* NC = Not connected status
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* N = Normal status
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* D = Degraded status
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* FU = Full update status
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* BG = Bad generation id status
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*
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* Expected path:
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* ->NC->N->D->N->NC
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* @throws Exception If a problem occurred
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*/
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@Test(enabled=true, dataProvider="stateMachineStatusAnalyzerTestProvider")
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public void testStateMachineStatusAnalyzer(int thresholdValue) throws Throwable
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{
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String testCase = "testStateMachineStatusAnalyzer with threhold " + thresholdValue;
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debugInfo("Starting " + testCase + " with " + thresholdValue);
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initTest();
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BrokerReader br3 = null;
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BrokerReader br2 = null;
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BrokerWriter bw = null;
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try
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{
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/* RS1 starts with specified threshold value */
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rs1 = createReplicationServer(testCase, thresholdValue);
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/*
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* DS2 starts and connects to RS1. No reader and low window value at the beginning
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* so writer for DS2 in RS should enqueue changes after first changes sent to DS.
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* (window value reached: a window msg needed by RS for following sending changes to DS)
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*/
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ds2 = createReplicationBroker(DS2_ID, new ServerState(), EMPTY_DN_GENID);
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waitUntiConnected(DS2_ID);
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/* DS3 starts and connects to RS1 */
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ds3 = createReplicationBroker(DS3_ID, new ServerState(), EMPTY_DN_GENID);
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br3 = new BrokerReader(ds3, DS3_ID);
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waitUntiConnected(DS3_ID);
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// Send first changes to reach window and block DS2 writer queue. Writer will take them
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// from queue and block (no more changes removed from writer queue) after
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// having sent them to TCP receive queue of DS2.
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bw = new BrokerWriter(ds3, DS3_ID, false);
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bw.followAndPause(11);
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/*
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* DS3 sends changes (less than threshold): DS2 should still be in normal status
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* so no topo message should be sent (update topo message for telling status of DS2 changed)
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*/
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int nChangesSent = 0;
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if (thresholdValue > 1)
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{
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nChangesSent = thresholdValue - 1;
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bw.followAndPause(nChangesSent);
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Thread.sleep(1000); // Be sure status analyzer has time to test
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ReplicationMsg msg = br3.getLastMsg();
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debugInfo(testCase + " Step 1: last message from writer: " + msg);
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assertNull(msg, (msg != null) ? msg.toString() : "null");
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}
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/*
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* DS3 sends changes to reach the threshold value,
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* DS3 should receive an update topo message with status of DS2: degraded status
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*/
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bw.followAndPause(thresholdValue - nChangesSent);
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// wait for a status MSG status analyzer to broker 3
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waitForDegradedStatusOnBroker3();
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/*
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* DS3 sends 10 additional changes after threshold value,
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* DS2 should still be degraded so no topo message received.
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*/
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bw.followAndPause(10);
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shutdown(bw);
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Thread.sleep(1000); // Be sure status analyzer has time to test
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ReplicationMsg lastMsg = br3.getLastMsg();
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ReplicationMsg msg = br3.getLastMsg();
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debugInfo(testCase + " Step 3: last message from writer: " + msg);
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assertNull(lastMsg);
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/*
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* DS2 replays every changes and should go back to normal status
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* (create a reader to emulate replay of messages (messages read from queue))
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*/
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br2 = new BrokerReader(ds2, DS2_ID);
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// wait for a status MSG status analyzer to broker 3
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waitForDegradedStatusOnBroker3();
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} finally
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{
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endTest();
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shutdown(bw);
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shutdown(br3);
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shutdown(br2);
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}
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}
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private void waitForDegradedStatusOnBroker3() throws InterruptedException
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{
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for (int count = 0; count< 50; count++)
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{
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DSInfo dsInfo = ds3.getReplicaInfos().get(DS2_ID);
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if (dsInfo != null && dsInfo.getStatus() == ServerStatus.DEGRADED_STATUS)
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{
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break;
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}
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assertTrue(count < 50, "DS2 did not get degraded : " + dsInfo);
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Thread.sleep(200); // Be sure status analyzer has time to test
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}
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}
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/*
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* Note: the former testStateMachineFull test (a walk through all state
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* machine transitions) has been removed. It had been disabled forever and
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* turned out to be unfixable in its historical form:
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* - it relied on the DS entering the degraded status while replaying a
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* change flood, which requires the replay to be durably slower than the
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* publisher; on modern hardware both rates are comparable, making every
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* degraded transition a race,
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* - the unbounded floods needed to force the degraded status exhaust the
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* test JVM heap with real backend entries before the status analyzer
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* (5 second period) reliably observes a non-empty queue with the
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* degraded threshold of 1.
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* The degraded/normal transitions are still covered deterministically by
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* testStateMachineStatusAnalyzer above.
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*/
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/**
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* Set up the environment.
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*
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* @throws Exception
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* If the environment could not be set up.
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*/
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@BeforeClass
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@Override
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public void setUp() throws Exception
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{
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super.setUp();
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EXAMPLE_DN_ = DN.valueOf(EXAMPLE_DN);
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// Note: this test does not use the memory test backend as for having a DS
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// going into degraded status, we need to send a lot of updates. This makes
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// the memory test backend crash with OutOfMemoryError. So we prefer here
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// a backend backed up with a file
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TestCaseUtils.clearBackend("userRoot");
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}
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/**
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* Clean up the environment.
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*
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* @throws Exception If the environment could not be set up.
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*/
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@AfterClass
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@Override
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public void classCleanUp() throws Exception
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{
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callParanoiaCheck = false;
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super.classCleanUp();
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TestCaseUtils.clearBackend("userRoot");
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paranoiaCheck();
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}
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/** Thread for sending a lot of changes through a broker. */
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private class BrokerWriter extends Thread
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{
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private ReplicationBroker rb;
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private int serverId = -1;
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private long userId;
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private AtomicBoolean shutdown = new AtomicBoolean(false);
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/** The writer starts suspended. */
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private AtomicBoolean suspended = new AtomicBoolean(true);
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/**
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* Tells a sending session is finished. A session is sending messages
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* between the follow and the pause calls, or the time a followAndPause
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* method runs.
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*/
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private AtomicBoolean sessionDone = new AtomicBoolean(true);
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private boolean careAboutAmountOfChanges;
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/** Number of sent changes. */
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private int nChangesSent;
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private int nChangesSentLimit;
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private CSNGenerator gen;
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private Object sleeper = new Object();
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/**
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* If the BrokerWriter is to be used for a lot of changes to send (which is
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* often the case), the reader thread should be enabled to make the window
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* subsystem work and allow the broker to send as much changes as he wants.
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* If not enabled, the user is responsible to call the receive method of
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* the broker himself.
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*/
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private BrokerReader reader;
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/** Creates a broker writer. Also creates a reader according to request */
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public BrokerWriter(ReplicationBroker rb, int serverId,
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boolean createReader)
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{
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super("BrokerWriter for broker " + serverId);
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this.rb = rb;
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this.serverId = serverId;
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// Create a csn generator to generate new csns
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// when we need to send changes
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gen = new CSNGenerator(serverId, 0);
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// Start thread (is paused by default so will have to call follow anyway)
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start();
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// Also create reader ?
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if (createReader)
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{
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reader = new BrokerReader(rb, serverId);
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}
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}
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/**
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* Loops sending changes: add operations creating users with different ids
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* This starts paused and has to be resumed calling a follow method.
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*/
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@Override
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public void run()
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{
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boolean dbg1Written = false, dbg2Written;
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// No stop msg when entering the loop (thread starts with paused writer)
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dbg2Written = true;
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while (!shutdown.get())
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{
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long startSessionTime = -1;
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boolean startedNewSession = false;
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// When not in pause, loop sending changes to RS
|
while (!suspended.get())
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{
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startedNewSession = true;
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if (!dbg1Written)
|
{
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startSessionTime = System.currentTimeMillis();
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debugInfo("Broker " + serverId +
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" writer starting sending changes session at: " + startSessionTime);
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dbg1Written = true;
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dbg2Written = false;
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}
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AddMsg addMsg = createNextAddMsg();
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rb.publish(addMsg);
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// End session if amount of changes sent has been requested
|
if (careAboutAmountOfChanges)
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{
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nChangesSent++;
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if (nChangesSent == nChangesSentLimit)
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{
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// Requested number of changes to send sent, end session
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debugInfo("Broker " + serverId + " writer reached " +
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nChangesSent + " changes limit");
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suspended.set(true);
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break;
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}
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}
|
}
|
if (!dbg2Written)
|
{
|
long endSessionTime = System.currentTimeMillis();
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debugInfo("Broker " + serverId +
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" writer stopping sending changes session at: " + endSessionTime +
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" (duration: " + (endSessionTime - startSessionTime) + " ms)");
|
dbg1Written = false;
|
dbg2Written = true;
|
}
|
// Mark session is finished
|
if (startedNewSession)
|
{
|
sessionDone.set(true);
|
}
|
|
try
|
{
|
// Writer in pause, sleep a while to let other threads work
|
synchronized(sleeper)
|
{
|
sleeper.wait(1000);
|
}
|
} catch (InterruptedException ex)
|
{
|
/* Don't care */
|
}
|
}
|
debugInfo("Broker " + serverId + " writer thread is dying");
|
}
|
|
/** Stops the writer thread. */
|
public void shutdown()
|
{
|
suspended.set(true); // If were working
|
shutdown.set(true);
|
synchronized (sleeper)
|
{
|
sleeper.notify();
|
}
|
try
|
{
|
join();
|
} catch (InterruptedException ex)
|
{
|
/* Don't care */
|
}
|
|
// Stop reader if any
|
StateMachineTest.shutdown(reader);
|
}
|
|
/** Suspends the writer thread. */
|
public void pause()
|
{
|
if (isPaused())
|
{
|
return; // Already suspended
|
}
|
suspended.set(true);
|
// Wait for all messages sent
|
while (!sessionDone.get())
|
{
|
TestCaseUtils.sleep(200);
|
}
|
}
|
|
/** Test if the writer is suspended. */
|
public boolean isPaused()
|
{
|
return sessionDone.get();
|
}
|
|
/** Resumes the writer thread until it is paused. */
|
public void follow()
|
{
|
sessionDone.set(false);
|
suspended.set(false);
|
}
|
|
/**
|
* Resumes the writer and suspends it after a given amount of changes has been
|
* sent. If the writer was working it will be paused anyway after the given
|
* amount of changes, starting from the current call time.
|
* -> blocking call
|
*/
|
public void followAndPause(int nChanges)
|
{
|
debugInfo("Requested broker writer " + serverId + " to write " + nChanges + " change(s).");
|
pause(); // If however we were already working
|
|
// Initialize counter system variables
|
nChangesSent = 0;
|
nChangesSentLimit = nChanges;
|
careAboutAmountOfChanges = true;
|
|
// Start session
|
sessionDone.set(false);
|
suspended.set(false);
|
|
// Wait for all messages sent
|
while (!sessionDone.get())
|
{
|
TestCaseUtils.sleep(1000);
|
}
|
careAboutAmountOfChanges = false;
|
}
|
|
private AddMsg createNextAddMsg()
|
{
|
String userEntryUUID = "11111111-1111-1111-1111-111111111111";
|
long curId = userId++;
|
String userdn = "uid=user" + curId + "," + EXAMPLE_DN;
|
Entry personWithUUIDEntry = null;
|
try
|
{
|
// @Formatter:off
|
personWithUUIDEntry = TestCaseUtils.makeEntry(
|
"dn: " + userdn,
|
"objectClass: top",
|
"objectClass: person",
|
"objectClass: organizationalPerson",
|
"objectClass: inetOrgPerson",
|
"uid: user" + curId + "",
|
"homePhone: 951-245-7634",
|
"description: This is the description for Aaccf Amar.",
|
"st: NC",
|
"mobile: 027-085-0537",
|
"postalAddress: Aaccf Amar$17984 Thirteenth Street$Rockford, NC 85762",
|
"mail: user.1@example.com",
|
"cn: Aaccf Amar",
|
"l: Rockford",
|
"pager: 508-763-4246",
|
"street: 17984 Thirteenth Street",
|
"telephoneNumber: 216-564-6748",
|
"employeeNumber: 1",
|
"sn: Amar",
|
"givenName: Aaccf",
|
"postalCode: 85762",
|
"userPassword: password",
|
"initials: AA",
|
"entryUUID: " + userEntryUUID);
|
// @Formatter:on
|
} catch (Exception e)
|
{
|
throw new RuntimeException(e);
|
}
|
|
// Create an update message to add an entry.
|
return new AddMsg(gen.newCSN(),
|
personWithUUIDEntry.getName(),
|
userEntryUUID,
|
null,
|
personWithUUIDEntry.getObjectClassAttribute(),
|
personWithUUIDEntry.getAllAttributes(), null);
|
}
|
}
|
|
/**
|
* This simple reader just throws away the received
|
* messages. It is used on a breaker we want to be able to send or read from some message
|
* with (changes, entries (full update)...). Calling the receive method of the
|
* broker allows to unblock the window mechanism and to send the desired messages.
|
* Calling the updateWindowAfterReplay method allows to send when necessary the
|
* window message to the RS to allow him send other messages he may want to send us.
|
*/
|
private class BrokerReader extends Thread
|
{
|
private ReplicationBroker rb;
|
private int serverId = -1;
|
private boolean shutdown;
|
private ReplicationMsg lastMsg;
|
|
public BrokerReader(ReplicationBroker rb, int serverId)
|
{
|
super("BrokerReader for broker " + serverId);
|
this.rb = rb;
|
this.serverId = serverId;
|
start();
|
}
|
|
/** Loop reading and throwing update messages. */
|
@Override
|
public void run()
|
{
|
while (!shutdown)
|
{
|
try
|
{
|
ReplicationMsg msg = rb.receive(); // Allow more messages to be sent by broker writer
|
rb.updateWindowAfterReplay(); // Allow RS to send more messages to broker
|
if (msg != null)
|
{
|
debugInfo("Broker " + serverId + " reader received: " + msg);
|
}
|
lastMsg = msg;
|
} catch (SocketTimeoutException ex)
|
{
|
if (shutdown)
|
{
|
return;
|
}
|
}
|
}
|
debugInfo("Broker " + serverId + " reader thread is dying");
|
}
|
|
/** Returns last received message from reader When read, last value is cleared. */
|
public ReplicationMsg getLastMsg()
|
{
|
ReplicationMsg toReturn = lastMsg;
|
lastMsg = null;
|
return toReturn;
|
}
|
|
/** Stops reader thread. */
|
public void shutdown()
|
{
|
shutdown = true;
|
|
try
|
{
|
join();
|
} catch (InterruptedException ex)
|
{
|
/* Don't care */
|
}
|
}
|
}
|
|
/**
|
* Waits until the domain status reaches the expected status.
|
* @param domain The domain whose status we want to test
|
* @param expectedStatus The expected domain status
|
*/
|
private void waitUntilStatusEquals(final LDAPReplicationDomain domain, final ServerStatus expectedStatus)
|
throws Exception
|
{
|
assertNotNull(domain);
|
assertNotNull(expectedStatus);
|
|
TestTimer timer = new TestTimer.Builder()
|
.maxSleep(30, SECONDS)
|
.sleepTimes(500, MILLISECONDS)
|
.toTimer();
|
timer.repeatUntilSuccess(new CallableVoid()
|
{
|
@Override
|
public void call() throws Exception
|
{
|
assertEquals(domain.getStatus(), expectedStatus);
|
}
|
});
|
}
|
}
|
