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MasterImplConversationStopFuzzIT.java
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MasterImplConversationStopFuzzIT.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.ha.com.master;
import org.junit.After;
import org.junit.Test;
import java.io.IOException;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicLong;
import org.neo4j.com.RequestContext;
import org.neo4j.com.ResourceReleaser;
import org.neo4j.com.Response;
import org.neo4j.com.TransactionNotPresentOnMasterException;
import org.neo4j.com.TransactionObligationResponse;
import org.neo4j.com.storecopy.StoreWriter;
import org.neo4j.helpers.Clock;
import org.neo4j.kernel.IdType;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.ha.cluster.ConversationSPI;
import org.neo4j.kernel.ha.cluster.DefaultConversationSPI;
import org.neo4j.kernel.ha.id.IdAllocation;
import org.neo4j.kernel.impl.enterprise.lock.forseti.ForsetiLockManager;
import org.neo4j.kernel.impl.locking.Locks;
import org.neo4j.kernel.impl.locking.ResourceTypes;
import org.neo4j.kernel.impl.store.StoreId;
import org.neo4j.kernel.impl.transaction.TransactionRepresentation;
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore;
import org.neo4j.kernel.impl.util.JobScheduler;
import org.neo4j.kernel.impl.util.Neo4jJobScheduler;
import org.neo4j.kernel.impl.util.collection.ConcurrentAccessException;
import org.neo4j.kernel.impl.util.collection.TimedRepository;
import org.neo4j.kernel.lifecycle.LifeSupport;
import org.neo4j.kernel.monitoring.Monitors;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;
import static org.neo4j.cluster.ClusterSettings.server_id;
import static org.neo4j.helpers.collection.MapUtil.stringMap;
import static org.neo4j.kernel.ha.HaSettings.lock_read_timeout;
/**
* Current test will try to emulate client master conversation lifecycle
* starting from handshake till end of the session,
* including simulation of idle conversations cleanup and inactive session removal.
*
* Workers will try to follow common patterns of client-server communication using defined state machine.
* Except common cases state machine will try to simulate abnormal behaviour and will
* fall into sleep from time to time emulating inactivates.
*
*/
public class MasterImplConversationStopFuzzIT
{
private static final int numberOfWorkers = 10;
private static final int numberOfOperations = 1_000;
private static final int numberOfResources = 100;
public static final StoreId StoreId = new StoreId();
private final LifeSupport life = new LifeSupport();
private final ExecutorService executor = Executors.newFixedThreadPool( numberOfWorkers + 1 );
private final JobScheduler scheduler = life.add( new Neo4jJobScheduler() );
private final Config config = new Config( stringMap( server_id.name(), "0", lock_read_timeout.name(), "1" ) );
private final Locks locks = new ForsetiLockManager( ResourceTypes.NODE, ResourceTypes.SCHEMA );
private static MasterExecutionStatistic executionStatistic = new MasterExecutionStatistic();
@Test( timeout = 50000 )
public void shouldHandleRandomizedLoad() throws Throwable
{
// Given
DefaultConversationSPI conversationSPI = new DefaultConversationSPI( locks, scheduler );
final ExposedConversationManager
conversationManager = new ExposedConversationManager( conversationSPI, config, 100, 0 );
ConversationTestMasterSPI conversationTestMasterSPI = new ConversationTestMasterSPI();
MasterImpl master = new MasterImpl( conversationTestMasterSPI, conversationManager,
new Monitors().newMonitor( MasterImpl.Monitor.class ), config );
life.add( conversationManager);
life.start();
ConversationKiller conversationKiller = new ConversationKiller( conversationManager );
executor.submit( conversationKiller );
List<Callable<Void>> slaveWorkers = workers( master, numberOfWorkers );
List<Future<Void>> workers = executor.invokeAll( slaveWorkers );
// Wait for all workers to complete
for ( Future<Void> future : workers )
{
future.get();
}
conversationKiller.stop();
assertTrue( executionStatistic.isSuccessfulExecution() );
}
@After
public void cleanup() throws InterruptedException
{
life.shutdown();
executor.shutdownNow();
}
private List<Callable<Void>> workers( MasterImpl master, int numWorkers )
{
LinkedList<Callable<Void>> workers = new LinkedList<>();
for ( int i = 0; i < numWorkers; i++ )
{
workers.add( new SlaveEmulatorWorker( master, i ) );
}
return workers;
}
static class SlaveEmulatorWorker implements Callable<Void>
{
private final Random random;
private final MasterImpl master;
private final int machineId;
private State state = State.UNINITIALIZED;
private long lastTx = 0;
private long epoch;
private RequestContext requestContext;
enum State
{
UNINITIALIZED
{
@Override
State next( SlaveEmulatorWorker worker )
{
HandshakeResult handshake = worker.master.handshake( worker.lastTx, StoreId ).response();
worker.epoch = handshake.epoch();
return IDLE;
}
},
IDLE
{
@Override
State next( SlaveEmulatorWorker worker ) throws Exception
{
if ( lowProbabilityEvent( worker ) )
{
return UNINITIALIZED;
}
else if ( lowProbabilityEvent( worker ) )
{
return commit( worker, new RequestContext( worker.epoch, worker.machineId, -1, worker.lastTx, 0 ) );
}
else
{
try
{
worker.master.newLockSession( worker.newRequestContext() );
return IN_SESSION;
}
catch ( TransactionFailureException e )
{
if ( e.getCause() instanceof ConcurrentAccessException )
{
executionStatistic.reportAlreadyInUseError();
return IDLE;
}
else
{
throw e;
}
}
}
}
},
IN_SESSION
{
@Override
State next( SlaveEmulatorWorker worker ) throws Exception
{
if ( lowProbabilityEvent( worker ) )
{
return UNINITIALIZED;
}
else
{
int i = worker.random.nextInt( 10 );
if ( i >= 5 )
{
return commit( worker, worker.requestContext );
}
else if ( i >= 4 )
{
worker.master.acquireExclusiveLock( worker.requestContext, ResourceTypes.NODE,
randomResource( worker ) );
return IN_SESSION;
}
else if ( i >= 1 )
{
worker.master.acquireSharedLock( worker.requestContext, ResourceTypes.NODE,
randomResource( worker ) );
return IN_SESSION;
}
else
{
endLockSession( worker );
return IDLE;
}
}
}
},
CLOSING_SESSION
{
@Override
State next( SlaveEmulatorWorker worker ) throws Exception
{
if ( lowProbabilityEvent( worker ) )
{
return UNINITIALIZED;
}
else
{
endLockSession( worker );
return IDLE;
}
}
};
abstract State next( SlaveEmulatorWorker worker ) throws Exception;
protected State commit( SlaveEmulatorWorker worker, RequestContext requestContext )
throws IOException, TransactionFailureException
{
try
{
worker.master.commit( requestContext, mock( TransactionRepresentation.class ) );
executionStatistic.reportCommittedOperation();
return CLOSING_SESSION;
}
catch ( TransactionNotPresentOnMasterException e )
{
executionStatistic.reportTransactionNotPresentError();
return IDLE;
}
}
}
private static boolean lowProbabilityEvent( SlaveEmulatorWorker worker )
{
return worker.random.nextInt( 100 ) <= 1;
}
private static long randomResource( SlaveEmulatorWorker worker )
{
return worker.random.nextInt( numberOfResources );
}
public SlaveEmulatorWorker( MasterImpl master, int clientNumber)
{
this.machineId = clientNumber;
this.random = new Random( machineId );
this.master = master;
}
@Override
public Void call() throws Exception
{
for ( int i = 0; i < numberOfOperations; i++ )
{
state = state.next( this );
}
return null;
}
private RequestContext newRequestContext()
{
return requestContext = new RequestContext( epoch, machineId, newLockSessionId(), lastTx, random.nextInt() );
}
private int newLockSessionId()
{
return random.nextInt();
}
private static void endLockSession( SlaveEmulatorWorker worker )
{
boolean successfulSession = worker.random.nextBoolean();
worker.master.endLockSession( worker.requestContext, successfulSession );
}
}
static class ConversationTestMasterSPI implements MasterImpl.SPI
{
@Override
public boolean isAccessible()
{
return true;
}
@Override
public StoreId storeId()
{
return StoreId;
}
@Override
public long applyPreparedTransaction( TransactionRepresentation preparedTransaction )
throws IOException, TransactionFailureException
{
// sleeping here and hope to be noticed by conversation killer.
sleep();
return 0;
}
private void sleep()
{
try
{
Thread.sleep( 20 );
}
catch ( InterruptedException e )
{
throw new RuntimeException( e );
}
}
@Override
public long getTransactionChecksum( long txId ) throws IOException
{
return 0;
}
@Override
public <T> Response<T> packEmptyResponse( T response )
{
return new TransactionObligationResponse<>( response, StoreId, TransactionIdStore.BASE_TX_ID,
ResourceReleaser.NO_OP );
}
@Override
public <T> Response<T> packTransactionObligationResponse( RequestContext context, T response )
{
return packEmptyResponse( response );
}
@Override
public IdAllocation allocateIds( IdType idType )
{
throw new UnsupportedOperationException();
}
@Override
public Integer createRelationshipType( String name )
{
throw new UnsupportedOperationException();
}
@Override
public RequestContext flushStoresAndStreamStoreFiles( StoreWriter writer )
{
throw new UnsupportedOperationException();
}
@Override
public <T> Response<T> packTransactionStreamResponse( RequestContext context, T response )
{
throw new UnsupportedOperationException();
}
@Override
public int getOrCreateLabel( String name )
{
throw new UnsupportedOperationException();
}
@Override
public int getOrCreateProperty( String name )
{
throw new UnsupportedOperationException();
}
}
/**
* This emulates the MasterServer behavior of killing conversations after they have not had traffic sent on them for
* a certain time
*/
private static class ConversationKiller implements Runnable
{
private volatile boolean running = true;
private final ConversationManager conversationManager;
public ConversationKiller( ConversationManager conversationManager )
{
this.conversationManager = conversationManager;
}
@Override
public void run()
{
try
{
while ( running )
{
Iterator<RequestContext> conversationIterator = conversationManager.getActiveContexts().iterator();
if ( conversationIterator.hasNext() )
{
RequestContext next = conversationIterator.next();
conversationManager.end( next );
}
try
{
Thread.sleep( 10 );
}
catch ( InterruptedException e )
{
throw new RuntimeException( e );
}
}
}
catch ( Throwable e )
{
throw new RuntimeException( "Conversation killer failed.", e );
}
}
public void stop()
{
running = false;
}
}
private class ExposedConversationManager extends ConversationManager {
private TimedRepository<RequestContext,Conversation> conversationStore;
public ExposedConversationManager( ConversationSPI spi, Config config, int activityCheckInterval,
int lockTimeoutAddition )
{
super( spi, config, activityCheckInterval, lockTimeoutAddition );
}
@Override
protected TimedRepository<RequestContext,Conversation> createConversationStore()
{
conversationStore = new TimedRepository<>( getConversationFactory(), getConversationReaper(),
1, Clock.SYSTEM_CLOCK );
return conversationStore;
}
}
private static class MasterExecutionStatistic
{
private final AtomicLong alreadyInUseErrors = new AtomicLong();
private final AtomicLong transactionNotPresentErrors = new AtomicLong();
private final AtomicLong committedOperations = new AtomicLong();
public void reportAlreadyInUseError()
{
alreadyInUseErrors.incrementAndGet();
}
public void reportTransactionNotPresentError()
{
transactionNotPresentErrors.incrementAndGet();
}
public void reportCommittedOperation()
{
committedOperations.incrementAndGet();
}
public AtomicLong getAlreadyInUseErrors()
{
return alreadyInUseErrors;
}
public AtomicLong getTransactionNotPresentErrors()
{
return transactionNotPresentErrors;
}
public AtomicLong getCommittedOperations()
{
return committedOperations;
}
public boolean isSuccessfulExecution()
{
return committedOperations.get() > ((alreadyInUseErrors.get() + transactionNotPresentErrors.get()) * 10);
}
}
}