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TwoInstanceClusterIT.java
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TwoInstanceClusterIT.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 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;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.kernel.ha.cluster.HighAvailabilityMemberState;
import org.neo4j.kernel.impl.ha.ClusterManager;
import org.neo4j.test.ha.ClusterRule;
import static org.junit.Assert.assertEquals;
import static org.neo4j.kernel.impl.ha.ClusterManager.allSeesAllAsAvailable;
import static org.neo4j.kernel.impl.ha.ClusterManager.clusterOfSize;
import static org.neo4j.kernel.impl.ha.ClusterManager.memberSeesOtherMemberAsFailed;
public class TwoInstanceClusterIT
{
@Rule
public final ClusterRule clusterRule = new ClusterRule( getClass() );
private ClusterManager.ManagedCluster cluster;
@Before
public void setup() throws Exception
{
cluster = clusterRule
.withSharedSetting( HaSettings.read_timeout, "1s" )
.withSharedSetting( HaSettings.state_switch_timeout, "2s" )
.withSharedSetting( HaSettings.com_chunk_size, "1024" )
.withCluster( clusterOfSize( 2 ) )
.startCluster();
}
@Test
public void masterShouldRemainAvailableIfTheSlaveDiesAndRecovers() throws Throwable
{
HighlyAvailableGraphDatabase master = cluster.getMaster();
HighlyAvailableGraphDatabase theSlave = cluster.getAnySlave();
String propertyName = "prop";
String propertyValue1 = "value1";
String propertyValue2 = "value2";
long masterNodeId;
long slaveNodeId;
ClusterManager.RepairKit repairKit = cluster.fail( theSlave );
cluster.await( memberSeesOtherMemberAsFailed( master, theSlave ) );
try( Transaction tx = master.beginTx() )
{
Node node = master.createNode();
node.setProperty( propertyName, propertyValue1 );
masterNodeId = node.getId();
tx.success();
}
repairKit.repair();
cluster.await( allSeesAllAsAvailable() );
try( Transaction tx = theSlave.beginTx() )
{
Node node = theSlave.createNode();
node.setProperty( propertyName, propertyValue2 );
assertEquals( propertyValue1, theSlave.getNodeById( masterNodeId ).getProperty( propertyName ) );
slaveNodeId = node.getId();
tx.success();
}
try( Transaction tx = master.beginTx() )
{
assertEquals( propertyValue2, master.getNodeById( slaveNodeId ).getProperty( propertyName ) );
tx.success();
}
}
@Test
public void slaveShouldMoveToPendingAndThenRecoverIfMasterDiesAndThenRecovers() throws Throwable
{
HighlyAvailableGraphDatabase master = cluster.getMaster();
HighlyAvailableGraphDatabase theSlave = cluster.getAnySlave();
String propertyName = "prop";
String propertyValue = "value1";
long slaveNodeId;
ClusterManager.RepairKit repairKit = cluster.fail( master );
cluster.await( memberSeesOtherMemberAsFailed( theSlave, master) );
assertEquals( HighAvailabilityMemberState.PENDING, theSlave.getInstanceState() );
repairKit.repair();
cluster.await( allSeesAllAsAvailable() );
try( Transaction tx = theSlave.beginTx() )
{
Node node = theSlave.createNode();
slaveNodeId = node.getId();
node.setProperty( propertyName, propertyValue );
tx.success();
}
try( Transaction tx = master.beginTx() )
{
assertEquals( propertyValue, master.getNodeById( slaveNodeId ).getProperty( propertyName ) );
tx.success();
}
}
}