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HeartbeatContextImplTest.java
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HeartbeatContextImplTest.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.cluster.protocol.atomicbroadcast.multipaxos.context;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.junit.Test;
import org.neo4j.cluster.DelayedDirectExecutor;
import org.neo4j.cluster.InstanceId;
import org.neo4j.cluster.protocol.cluster.ClusterConfiguration;
import org.neo4j.cluster.protocol.heartbeat.HeartbeatContext;
import org.neo4j.cluster.protocol.heartbeat.HeartbeatListener;
import org.neo4j.cluster.timeout.Timeouts;
import org.neo4j.logging.NullLogProvider;
import static java.util.Collections.singletonList;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import static org.neo4j.cluster.protocol.atomicbroadcast.multipaxos.ClusterProtocolAtomicbroadcastTestUtil.ids;
import static org.neo4j.cluster.protocol.atomicbroadcast.multipaxos.ClusterProtocolAtomicbroadcastTestUtil.members;
public class HeartbeatContextImplTest
{
@Test
public void shouldFailAndAliveBothNotifyHeartbeatListenerInDelayedDirectExecutor() throws Throwable
{
// Given
InstanceId me = new InstanceId( 1 );
InstanceId failedMachine = new InstanceId( 2 );
InstanceId goodMachine = new InstanceId( 3 );
Timeouts timeouts = mock( Timeouts.class );
CommonContextState commonState = mock( CommonContextState.class );
ClusterConfiguration configuration = mock (ClusterConfiguration.class);
when( commonState.configuration() ).thenReturn( configuration );
when( configuration.getMembers() ).thenReturn( members( 3 ) );
when( configuration.getMemberIds() ).thenReturn( ids( 3 ) );
final List<Runnable> runnables = new ArrayList<>();
HeartbeatContext context =
new HeartbeatContextImpl( me, commonState, NullLogProvider.getInstance(), timeouts,
new DelayedDirectExecutor( NullLogProvider.getInstance() )
{
@Override
public synchronized void execute( Runnable command )
{
runnables.add( command );
}
} );
context.addHeartbeatListener( mock( HeartbeatListener.class ) );
context.suspicions( goodMachine, new HashSet<>( singletonList( failedMachine ) ) );
context.suspect( failedMachine ); // fail
context.alive( failedMachine ); // alive
// Then
assertEquals( 2, runnables.size() ); // fail + alive
}
@Test
public void shouldFailAllInstancesIfAllOtherInstancesAreSuspected() throws Exception
{
// Given
InstanceId me = new InstanceId( 1 );
InstanceId member2 = new InstanceId( 2 );
InstanceId member3 = new InstanceId( 3 );
Timeouts timeouts = mock( Timeouts.class );
CommonContextState commonState = mock( CommonContextState.class );
ClusterConfiguration configuration = mock ( ClusterConfiguration.class );
when( commonState.configuration() ).thenReturn( configuration );
when( configuration.getMembers() ).thenReturn( members( 3 ) );
when( configuration.getMemberIds() ).thenReturn( ids( 3 ) );
DelayedDirectExecutor executor = new DelayedDirectExecutor( NullLogProvider.getInstance() );
HeartbeatContext context =
new HeartbeatContextImpl( me, commonState, NullLogProvider.getInstance(), timeouts,
executor );
final List<InstanceId> failed = new ArrayList<>( 2 );
HeartbeatListener listener = new HeartbeatListener()
{
@Override
public void failed( InstanceId server )
{
failed.add( server );
}
@Override
public void alive( InstanceId server )
{
failed.remove( server );
}
};
context.addHeartbeatListener( listener );
// when
// just one suspicion comes, no extra failing action should be taken
context.suspect( member2 );
executor.drain();
// then
assertEquals( 0, failed.size() );
// when
// the other instance is suspected, all instances must be marked as failed
context.suspect( member3 );
executor.drain();
// then
assertEquals( 2, failed.size() );
assertTrue( failed.contains( member2 ) );
assertTrue( failed.contains( member3 ) );
// when
// one of them comes alive again, only that instance should be marked as alive
context.alive( member2 );
executor.drain();
// then
assertEquals( 1, failed.size() );
assertTrue( failed.contains( member3 ) );
}
@Test
public void majorityOfNonSuspectedInstancesShouldBeEnoughToMarkAnInstanceAsFailed() throws Exception
{
// Given
InstanceId me = new InstanceId( 1 );
InstanceId member2 = new InstanceId( 2 );
InstanceId member3 = new InstanceId( 3 );
InstanceId member4 = new InstanceId( 4 );
InstanceId member5 = new InstanceId( 5 );
Timeouts timeouts = mock( Timeouts.class );
CommonContextState commonState = mock( CommonContextState.class );
ClusterConfiguration configuration = mock ( ClusterConfiguration.class );
when( commonState.configuration() ).thenReturn( configuration );
when( configuration.getMembers() ).thenReturn( members( 5 ) );
when( configuration.getMemberIds() ).thenReturn( ids( 5 ) );
DelayedDirectExecutor executor = new DelayedDirectExecutor( NullLogProvider.getInstance() );
HeartbeatContext context =
new HeartbeatContextImpl( me, commonState, NullLogProvider.getInstance(), timeouts,
executor );
final List<InstanceId> failed = new ArrayList<>( 4 );
HeartbeatListener listener = new HeartbeatListener()
{
@Override
public void failed( InstanceId server )
{
failed.add( server );
}
@Override
public void alive( InstanceId server )
{
failed.remove( server );
}
};
context.addHeartbeatListener( listener );
// when
// just two suspicions come, no extra failing action should be taken since this is not majority
context.suspect( member2 );
context.suspect( member3 );
executor.drain();
// then
assertEquals( 0, failed.size() );
// when
// the another instance suspects them, therefore have a majority of non suspected, then 2 and 3 must fail
Set<InstanceId> suspicionsFrom5 = new HashSet<>();
suspicionsFrom5.add( member2 );
suspicionsFrom5.add( member3 );
context.suspicions( member5, suspicionsFrom5 );
executor.drain();
// then
assertEquals( 2, failed.size() );
assertTrue( failed.contains( member2 ) );
assertTrue( failed.contains( member3 ) );
// when
// an instance sends a heartbeat, it should be set as alive
context.alive( member2 );
executor.drain();
// then
assertEquals( 1, failed.size() );
assertTrue( failed.contains( member3 ) );
}
}