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ClusterLocksIT.java
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ClusterLocksIT.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.lock;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.TransactionTerminatedException;
import org.neo4j.graphdb.TransientTransactionFailureException;
import org.neo4j.helpers.collection.Iterables;
import org.neo4j.kernel.api.exceptions.EntityNotFoundException;
import org.neo4j.kernel.ha.HaSettings;
import org.neo4j.kernel.ha.HighlyAvailableGraphDatabase;
import org.neo4j.kernel.impl.ha.ClusterManager;
import org.neo4j.storageengine.api.EntityType;
import org.neo4j.test.ha.ClusterRule;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.neo4j.helpers.Exceptions.stringify;
import static org.neo4j.kernel.impl.ha.ClusterManager.allSeesAllAsAvailable;
import static org.neo4j.kernel.impl.ha.ClusterManager.instanceEvicted;
public class ClusterLocksIT
{
private static final long TIMEOUT_MILLIS = 120_000;
@Rule
public final ClusterRule clusterRule = new ClusterRule( getClass() );
private ClusterManager.ManagedCluster cluster;
@Before
public void setUp() throws Exception
{
cluster = clusterRule.withSharedSetting( HaSettings.tx_push_factor, "2" ).startCluster();
}
private Label testLabel = Label.label( "testLabel" );
@Test( timeout = TIMEOUT_MILLIS )
public void lockCleanupOnModeSwitch() throws Throwable
{
HighlyAvailableGraphDatabase master = cluster.getMaster();
createNodeOnMaster( testLabel, master );
HighlyAvailableGraphDatabase slave = cluster.getAnySlave();
ClusterManager.RepairKit repairKit = takeExclusiveLockAndKillSlave( testLabel, slave );
// repair of slave and new mode switch cycle on all members
repairKit.repair();
cluster.await( allSeesAllAsAvailable() );
HighlyAvailableGraphDatabase clusterMaster = cluster.getMaster();
// now it should be possible to take exclusive lock on the same node
takeExclusiveLockOnSameNodeAfterSwitch( testLabel, master, clusterMaster );
}
@Test
public void aPendingMemberShouldBeAbleToServeReads() throws Throwable
{
createNodeOnMaster( testLabel, cluster.getMaster() );
cluster.sync();
HighlyAvailableGraphDatabase slave = cluster.getAnySlave();
AtomicBoolean run = new AtomicBoolean( true );
AtomicReference<Throwable> ref = new AtomicReference<>( );
Thread thread = new Thread()
{
@Override
public void run()
{
while ( run.get() )
{
try ( Transaction tx = slave.beginTx() )
{
Node single = Iterables.single( slave.getAllNodes() );
Label label = Iterables.single( single.getLabels() );
assertEquals( testLabel, label );
tx.success();
}
catch ( TransactionTerminatedException | TransientTransactionFailureException ex )
{
// this is fine we might have stopped or rolled back a transaction when we switched role..
}
catch ( Throwable t )
{
ref.compareAndSet( null, t );
}
}
}
};
thread.start();
cluster.fail( slave, ClusterManager.NetworkFlag.values() );
cluster.await( instanceEvicted( slave ), 20 );
run.set( false );
thread.join();
Throwable throwable = ref.get();
assertNull( stringify( throwable ), throwable );
}
private void takeExclusiveLockOnSameNodeAfterSwitch( Label testLabel, HighlyAvailableGraphDatabase master,
HighlyAvailableGraphDatabase db ) throws EntityNotFoundException
{
try ( Transaction transaction = db.beginTx() )
{
Node node = getNode( master, testLabel );
transaction.acquireWriteLock( node );
node.setProperty( "key", "value" );
transaction.success();
}
}
private ClusterManager.RepairKit takeExclusiveLockAndKillSlave( Label testLabel, HighlyAvailableGraphDatabase db )
throws EntityNotFoundException
{
Transaction transaction = db.beginTx();
Node node = getNode( db, testLabel );
transaction.acquireWriteLock( node );
return cluster.shutdown( db );
}
private void createNodeOnMaster( Label testLabel, HighlyAvailableGraphDatabase master )
{
try ( Transaction transaction = master.beginTx() )
{
master.createNode( testLabel );
transaction.success();
}
}
private Node getNode( HighlyAvailableGraphDatabase db, Label testLabel ) throws EntityNotFoundException
{
return db.findNodes( testLabel ).stream().findFirst()
.orElseThrow( () -> new EntityNotFoundException( EntityType.NODE, 0L ) );
}
}