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CountsTrackerTest.java
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CountsTrackerTest.java
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/*
* Copyright (c) 2002-2017 "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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.store.counts;
import org.junit.Rule;
import org.junit.Test;
import java.io.File;
import java.io.IOException;
import java.time.Clock;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.function.Predicate;
import org.neo4j.function.IOFunction;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.impl.api.CountsAccessor;
import org.neo4j.kernel.impl.api.CountsVisitor;
import org.neo4j.kernel.impl.store.CountsOracle;
import org.neo4j.kernel.impl.store.counts.keys.CountsKey;
import org.neo4j.kernel.impl.store.counts.keys.CountsKeyFactory;
import org.neo4j.kernel.impl.store.kvstore.DataInitializer;
import org.neo4j.kernel.impl.store.kvstore.ReadableBuffer;
import org.neo4j.kernel.impl.store.kvstore.RotationTimeoutException;
import org.neo4j.kernel.lifecycle.Lifespan;
import org.neo4j.register.Register;
import org.neo4j.register.Registers;
import org.neo4j.test.Barrier;
import org.neo4j.test.rule.Resources;
import org.neo4j.test.rule.concurrent.ThreadingRule;
import org.neo4j.time.Clocks;
import org.neo4j.time.FakeClock;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.neo4j.function.Predicates.all;
import static org.neo4j.kernel.impl.util.DebugUtil.classNameContains;
import static org.neo4j.kernel.impl.util.DebugUtil.methodIs;
import static org.neo4j.kernel.impl.util.DebugUtil.stackTraceContains;
import static org.neo4j.test.rule.Resources.InitialLifecycle.STARTED;
import static org.neo4j.test.rule.Resources.TestPath.FILE_IN_EXISTING_DIRECTORY;
public class CountsTrackerTest
{
@Rule
public final Resources resourceManager = new Resources( FILE_IN_EXISTING_DIRECTORY );
@Rule
public final ThreadingRule threading = new ThreadingRule();
@Test
public void shouldBeAbleToStartAndStopTheStore() throws Exception
{
// given
resourceManager.managed( newTracker() );
// when
resourceManager.lifeStarts();
resourceManager.lifeShutsDown();
}
@Test
@Resources.Life( STARTED )
public void shouldBeAbleToWriteDataToCountsTracker() throws Exception
{
// given
CountsTracker tracker = resourceManager.managed( newTracker() );
long indexId = 0;
CountsOracle oracle = new CountsOracle();
{
CountsOracle.Node a = oracle.node( 1 );
CountsOracle.Node b = oracle.node( 1 );
oracle.relationship( a, 1, b );
oracle.indexSampling( indexId, 2, 2 );
oracle.indexUpdatesAndSize( indexId, 10, 2 );
}
// when
oracle.update( tracker, 2 );
// then
oracle.verify( tracker );
// when
tracker.rotate( 2 );
// then
oracle.verify( tracker );
// when
try ( CountsAccessor.IndexStatsUpdater updater = tracker.updateIndexCounts() )
{
updater.incrementIndexUpdates( indexId, 2 );
}
// then
oracle.indexUpdatesAndSize( indexId, 12, 2 );
oracle.verify( tracker );
// when
tracker.rotate( 2 );
// then
oracle.verify( tracker );
}
@Test
public void shouldStoreCounts() throws Exception
{
// given
CountsOracle oracle = someData();
// when
try ( Lifespan life = new Lifespan() )
{
CountsTracker tracker = life.add( newTracker() );
oracle.update( tracker, 2 );
tracker.rotate( 2 );
}
// then
try ( Lifespan life = new Lifespan() )
{
oracle.verify( life.add( newTracker() ) );
}
}
@Test
public void shouldUpdateCountsOnExistingStore() throws Exception
{
// given
CountsOracle oracle = someData();
int firstTx = 2;
int secondTx = 3;
try ( Lifespan life = new Lifespan() )
{
CountsTracker tracker = life.add( newTracker() );
oracle.update( tracker, firstTx );
tracker.rotate( firstTx );
oracle.verify( tracker );
// when
CountsOracle delta = new CountsOracle();
{
CountsOracle.Node n1 = delta.node( 1 );
CountsOracle.Node n2 = delta.node( 1, 4 ); // Label 4 has not been used before...
delta.relationship( n1, 1, n2 );
delta.relationship( n2, 2, n1 ); // relationshipType 2 has not been used before...
}
delta.update( tracker, secondTx );
delta.update( oracle );
// then
oracle.verify( tracker );
// when
tracker.rotate( secondTx );
}
// then
try ( Lifespan life = new Lifespan() )
{
oracle.verify( life.add( newTracker() ) );
}
}
@Test
public void shouldBeAbleToReadUpToDateValueWhileAnotherThreadIsPerformingRotation() throws Exception
{
// given
CountsOracle oracle = someData();
final int firstTransaction = 2;
int secondTransaction = 3;
try ( Lifespan life = new Lifespan() )
{
CountsTracker tracker = life.add( newTracker() );
oracle.update( tracker, firstTransaction );
tracker.rotate( firstTransaction );
}
// when
final CountsOracle delta = new CountsOracle();
{
CountsOracle.Node n1 = delta.node( 1 );
CountsOracle.Node n2 = delta.node( 1, 4 ); // Label 4 has not been used before...
delta.relationship( n1, 1, n2 );
delta.relationship( n2, 2, n1 ); // relationshipType 2 has not been used before...
}
delta.update( oracle );
try ( Lifespan life = new Lifespan() )
{
final Barrier.Control barrier = new Barrier.Control();
CountsTracker tracker = life.add( new CountsTracker(
resourceManager.logProvider(), resourceManager.fileSystem(), resourceManager.pageCache(),
Config.empty(), resourceManager.testPath() )
{
@Override
protected boolean include( CountsKey countsKey, ReadableBuffer value )
{
barrier.reached();
return super.include( countsKey, value );
}
} );
Future<Void> task = threading.execute( t ->
{
try
{
delta.update( t, secondTransaction );
t.rotate( secondTransaction );
}
catch ( IOException e )
{
throw new AssertionError( e );
}
return null;
}, tracker );
// then
barrier.await();
oracle.verify( tracker );
barrier.release();
task.get();
oracle.verify( tracker );
}
}
@Test
public void shouldOrderStoreByTxIdInHeaderThenMinorVersion() throws Exception
{
// given
FileVersion version = new FileVersion( 16, 5 );
// then
assertTrue( CountsTracker.compare( version, new FileVersion( 5, 5 ) ) > 0 );
assertTrue( CountsTracker.compare( version, new FileVersion( 16, 5 ) ) == 0 );
assertTrue( CountsTracker.compare( version, new FileVersion( 30, 1 ) ) < 0 );
assertTrue( CountsTracker.compare( version, new FileVersion( 16, 1 ) ) > 0 );
assertTrue( CountsTracker.compare( version, new FileVersion( 16, 7 ) ) < 0 );
}
@Test
@Resources.Life( STARTED )
public void shouldNotRotateIfNoDataChanges() throws Exception
{
// given
CountsTracker tracker = resourceManager.managed( newTracker() );
File before = tracker.currentFile();
// when
tracker.rotate( tracker.txId() );
// then
assertSame( "not rotated", before, tracker.currentFile() );
}
@Test
@Resources.Life( STARTED )
public void shouldRotateOnDataChangesEvenIfTransactionIsUnchanged() throws Exception
{
// given
CountsTracker tracker = resourceManager.managed( newTracker() );
File before = tracker.currentFile();
try ( CountsAccessor.IndexStatsUpdater updater = tracker.updateIndexCounts() )
{
updater.incrementIndexUpdates( 7, 100 );
}
// when
tracker.rotate( tracker.txId() );
// then
assertNotEquals( "rotated", before, tracker.currentFile() );
}
@Test
@Resources.Life( STARTED )
public void shouldSupportTransactionsAppliedOutOfOrderOnRotation() throws Exception
{
// given
final CountsTracker tracker = resourceManager.managed( newTracker() );
try ( CountsAccessor.Updater tx = tracker.apply( 2 ).get() )
{
tx.incrementNodeCount( 1, 1 );
}
try ( CountsAccessor.Updater tx = tracker.apply( 4 ).get() )
{
tx.incrementNodeCount( 1, 1 );
}
// when
Future<Long> rotated = threading.executeAndAwait( new Rotation( 2 ), tracker, thread ->
{
switch ( thread.getState() )
{
case BLOCKED:
case WAITING:
case TIMED_WAITING:
case TERMINATED:
return true;
default:
return false;
}
}, 10, SECONDS );
try ( CountsAccessor.Updater tx = tracker.apply( 5 ).get() )
{
tx.incrementNodeCount( 1, 1 );
}
try ( CountsAccessor.Updater tx = tracker.apply( 3 ).get() )
{
tx.incrementNodeCount( 1, 1 );
}
// then
assertEquals( "rotated transaction", 4, rotated.get().longValue() );
assertEquals( "stored transaction", 4, tracker.txId() );
// the value in memory
assertEquals( "count", 4, tracker.nodeCount( 1, Registers.newDoubleLongRegister() ).readSecond() );
// the value in the store
CountsVisitor visitor = mock( CountsVisitor.class );
tracker.visitFile( tracker.currentFile(), visitor );
verify( visitor ).visitNodeCount( 1, 3 );
verifyNoMoreInteractions( visitor );
assertEquals( "final rotation", 5, tracker.rotate( 5 ) );
}
@Test
@Resources.Life( STARTED )
public void shouldNotEndUpInBrokenStateAfterRotationFailure() throws Exception
{
// GIVEN
FakeClock clock = Clocks.fakeClock();
CountsTracker tracker = resourceManager.managed( newTracker( clock ) );
int labelId = 1;
try ( CountsAccessor.Updater tx = tracker.apply( 2 ).get() )
{
tx.incrementNodeCount( labelId, 1 ); // now at 1
}
// WHEN
Predicate<Thread> arrived = thread ->
stackTraceContains( thread, all( classNameContains( "Rotation" ), methodIs( "rotate" ) ) );
Future<Object> rotation = threading.executeAndAwait( t -> t.rotate( 4 ), tracker, arrived, 100, MILLISECONDS );
try ( CountsAccessor.Updater tx = tracker.apply( 3 ).get() )
{
tx.incrementNodeCount( labelId, 1 ); // now at 2
}
clock.forward( Config.empty().get( GraphDatabaseSettings.counts_store_rotation_timeout ) * 2, MILLISECONDS );
try
{
rotation.get();
fail( "Should've failed rotation due to timeout" );
}
catch ( ExecutionException e )
{
// good
assertTrue( e.getCause() instanceof RotationTimeoutException );
}
// THEN
Register.DoubleLongRegister register = Registers.newDoubleLongRegister();
tracker.get( CountsKeyFactory.nodeKey( labelId ), register );
assertEquals( 2, register.readSecond() );
// and WHEN later attempting rotation again
try ( CountsAccessor.Updater tx = tracker.apply( 4 ).get() )
{
tx.incrementNodeCount( labelId, 1 ); // now at 3
}
tracker.rotate( 4 );
// THEN
tracker.get( CountsKeyFactory.nodeKey( labelId ), register );
assertEquals( 3, register.readSecond() );
}
private CountsTracker newTracker()
{
return newTracker( Clocks.systemClock() );
}
private CountsTracker newTracker( Clock clock )
{
return new CountsTracker( resourceManager.logProvider(), resourceManager.fileSystem(),
resourceManager.pageCache(), Config.empty(), resourceManager.testPath(), clock )
.setInitializer( new DataInitializer<CountsAccessor.Updater>()
{
@Override
public void initialize( CountsAccessor.Updater updater )
{
}
@Override
public long initialVersion()
{
return FileVersion.INITIAL_TX_ID;
}
} );
}
private CountsOracle someData()
{
CountsOracle oracle = new CountsOracle();
CountsOracle.Node n0 = oracle.node( 0, 1 );
CountsOracle.Node n1 = oracle.node( 0, 3 );
CountsOracle.Node n2 = oracle.node( 2, 3 );
CountsOracle.Node n3 = oracle.node( 2 );
oracle.relationship( n0, 1, n2 );
oracle.relationship( n1, 1, n3 );
oracle.relationship( n1, 1, n2 );
oracle.relationship( n0, 1, n3 );
long indexId = 2;
oracle.indexUpdatesAndSize( indexId, 0L, 50L );
oracle.indexSampling( indexId, 25L, 50L );
return oracle;
}
private static class Rotation implements IOFunction<CountsTracker, Long>
{
private final long txId;
Rotation( long txId )
{
this.txId = txId;
}
@Override
public Long apply( CountsTracker tracker ) throws IOException
{
return tracker.rotate( txId );
}
}
}