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ClusterOverviewIT.java
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ClusterOverviewIT.java
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/*
* Copyright (c) 2002-2018 "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.causalclustering.scenarios;
import org.hamcrest.Description;
import org.hamcrest.FeatureMatcher;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import java.net.URI;
import java.time.Clock;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;
import org.neo4j.causalclustering.core.CausalClusteringSettings;
import org.neo4j.causalclustering.core.consensus.roles.Role;
import org.neo4j.causalclustering.discovery.Cluster;
import org.neo4j.causalclustering.discovery.ClusterMember;
import org.neo4j.causalclustering.discovery.CoreClusterMember;
import org.neo4j.causalclustering.discovery.RoleInfo;
import org.neo4j.causalclustering.discovery.procedures.ClusterOverviewProcedure;
import org.neo4j.collection.RawIterator;
import org.neo4j.internal.kernel.api.Kernel;
import org.neo4j.internal.kernel.api.Session;
import org.neo4j.internal.kernel.api.Transaction;
import org.neo4j.internal.kernel.api.Transaction.Type;
import org.neo4j.internal.kernel.api.exceptions.KernelException;
import org.neo4j.internal.kernel.api.exceptions.ProcedureException;
import org.neo4j.internal.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.api.security.AnonymousContext;
import org.neo4j.kernel.configuration.Settings;
import org.neo4j.kernel.impl.factory.GraphDatabaseFacade;
import org.neo4j.test.causalclustering.ClusterRule;
import static java.util.concurrent.TimeUnit.SECONDS;
import static java.util.stream.Collectors.toList;
import static org.hamcrest.Matchers.allOf;
import static org.hamcrest.Matchers.containsInAnyOrder;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.not;
import static org.neo4j.causalclustering.discovery.RoleInfo.FOLLOWER;
import static org.neo4j.causalclustering.discovery.RoleInfo.LEADER;
import static org.neo4j.causalclustering.discovery.RoleInfo.READ_REPLICA;
import static org.neo4j.helpers.collection.Iterators.asSet;
import static org.neo4j.internal.kernel.api.procs.ProcedureSignature.procedureName;
import static org.neo4j.test.assertion.Assert.assertEventually;
@RunWith( Parameterized.class )
public class ClusterOverviewIT
{
@Rule
public ClusterRule clusterRule = new ClusterRule()
.withSharedCoreParam( CausalClusteringSettings.cluster_topology_refresh, "5s" );
@Parameterized.Parameters( name = "discovery-{0}" )
public static Collection<DiscoveryServiceType> data()
{
return Arrays.asList( DiscoveryServiceType.values() );
}
public ClusterOverviewIT( DiscoveryServiceType discoveryServiceType )
{
clusterRule.withDiscoveryServiceType( discoveryServiceType );
}
@Test
public void shouldDiscoverCoreMembers() throws Exception
{
// given
int coreMembers = 3;
clusterRule.withNumberOfCoreMembers( coreMembers );
clusterRule.withNumberOfReadReplicas( 0 );
// when
Cluster cluster = clusterRule.startCluster();
Matcher<List<MemberInfo>> expected = allOf(
containsMemberAddresses( cluster.coreMembers() ),
containsRole( LEADER, 1 ), containsRole( FOLLOWER, coreMembers - 1 ), doesNotContainRole( READ_REPLICA ) );
for ( int coreServerId = 0; coreServerId < coreMembers; coreServerId++ )
{
// then
assertEventualOverview( cluster, expected, coreServerId );
}
}
@Test
public void shouldDiscoverCoreMembersAndReadReplicas() throws Exception
{
// given
int coreMembers = 3;
clusterRule.withNumberOfCoreMembers( coreMembers );
int replicaCount = 3;
clusterRule.withNumberOfReadReplicas( replicaCount );
// when
Cluster cluster = clusterRule.startCluster();
Matcher<List<MemberInfo>> expected = allOf(
containsAllMemberAddresses( cluster.coreMembers(), cluster.readReplicas() ),
containsRole( LEADER, 1 ), containsRole( FOLLOWER, 2 ), containsRole( READ_REPLICA, replicaCount ) );
for ( int coreServerId = 0; coreServerId < coreMembers; coreServerId++ )
{
// then
assertEventualOverview( cluster, expected, coreServerId );
}
}
@Test
public void shouldDiscoverReadReplicasAfterRestartingCores() throws Exception
{
// given
int coreMembers = 3;
int readReplicas = 3;
clusterRule.withNumberOfCoreMembers( coreMembers );
clusterRule.withNumberOfReadReplicas( readReplicas );
// when
Cluster cluster = clusterRule.startCluster();
cluster.shutdownCoreMembers();
cluster.startCoreMembers();
Matcher<List<MemberInfo>> expected = allOf(
containsAllMemberAddresses( cluster.coreMembers(), cluster.readReplicas() ),
containsRole( LEADER, 1 ), containsRole( FOLLOWER, coreMembers - 1 ), containsRole( READ_REPLICA, readReplicas ) );
for ( int coreServerId = 0; coreServerId < coreMembers; coreServerId++ )
{
// then
assertEventualOverview( cluster, expected, coreServerId );
}
}
@Test
public void shouldDiscoverNewCoreMembers() throws Exception
{
// given
int initialCoreMembers = 3;
clusterRule.withNumberOfCoreMembers( initialCoreMembers );
clusterRule.withNumberOfReadReplicas( 0 );
Cluster cluster = clusterRule.startCluster();
// when
int extraCoreMembers = 2;
int finalCoreMembers = initialCoreMembers + extraCoreMembers;
IntStream.range( 0, extraCoreMembers ).forEach( idx -> cluster.addCoreMemberWithId( initialCoreMembers + idx ).start() );
Matcher<List<MemberInfo>> expected = allOf(
containsMemberAddresses( cluster.coreMembers() ),
containsRole( LEADER, 1 ), containsRole( FOLLOWER, finalCoreMembers - 1 ) );
for ( int coreServerId = 0; coreServerId < finalCoreMembers; coreServerId++ )
{
// then
assertEventualOverview( cluster, expected, coreServerId );
}
}
@Test
public void shouldDiscoverNewReadReplicas() throws Exception
{
// given
int coreMembers = 3;
int initialReadReplicas = 3;
clusterRule.withNumberOfCoreMembers( coreMembers );
clusterRule.withNumberOfReadReplicas( initialReadReplicas );
Cluster cluster = clusterRule.startCluster();
// when
cluster.addReadReplicaWithId( 3 ).start();
cluster.addReadReplicaWithId( 4 ).start();
Matcher<List<MemberInfo>> expected = allOf(
containsAllMemberAddresses( cluster.coreMembers(), cluster.readReplicas() ),
containsRole( LEADER, 1 ),
containsRole( FOLLOWER, coreMembers - 1 ),
containsRole( READ_REPLICA, initialReadReplicas + 2 ) );
for ( int coreServerId = 0; coreServerId < coreMembers; coreServerId++ )
{
// then
assertEventualOverview( cluster, expected, coreServerId );
}
}
@Test
public void shouldDiscoverRemovalOfReadReplicas() throws Exception
{
// given
int coreMembers = 3;
int initialReadReplicas = 3;
clusterRule.withNumberOfCoreMembers( coreMembers );
clusterRule.withNumberOfReadReplicas( initialReadReplicas );
Cluster cluster = clusterRule.startCluster();
for ( int coreServerId = 0; coreServerId < coreMembers; coreServerId++ )
{
assertEventualOverview( cluster, containsRole( READ_REPLICA, initialReadReplicas ), coreServerId );
}
// when
cluster.removeReadReplicaWithMemberId( 0 );
cluster.removeReadReplicaWithMemberId( 1 );
for ( int coreServerId = 0; coreServerId < coreMembers; coreServerId++ )
{
// then
assertEventualOverview( cluster, containsRole( READ_REPLICA, initialReadReplicas - 2 ), coreServerId );
}
}
@Test
public void shouldDiscoverRemovalOfCoreMembers() throws Exception
{
// given
int coreMembers = 5;
clusterRule.withNumberOfCoreMembers( coreMembers );
clusterRule.withNumberOfReadReplicas( 0 );
Cluster cluster = clusterRule.startCluster();
for ( int coreServerId = 0; coreServerId < coreMembers; coreServerId++ )
{
assertEventualOverview( cluster, allOf( containsRole( LEADER, 1 ), containsRole( FOLLOWER, coreMembers - 1 ) ),
coreServerId );
}
// when
cluster.removeCoreMemberWithServerId( 0 );
cluster.removeCoreMemberWithServerId( 1 );
for ( int coreServerId = 2; coreServerId < coreMembers; coreServerId++ )
{
// then
assertEventualOverview( cluster, allOf( containsRole( LEADER, 1 ), containsRole( FOLLOWER, coreMembers - 1 - 2 ) ),
coreServerId );
}
}
@Test
public void shouldDiscoverTimeoutBasedLeaderStepdown() throws Exception
{
clusterRule.withNumberOfCoreMembers( 3 );
clusterRule.withNumberOfReadReplicas( 2 );
Cluster cluster = clusterRule.startCluster();
List<CoreClusterMember> followers = cluster.getAllMembersWithRole( Role.FOLLOWER );
CoreClusterMember leader = cluster.getMemberWithRole( Role.LEADER );
followers.forEach( CoreClusterMember::shutdown );
assertEventualOverview( cluster, containsRole( LEADER, 0 ), leader.serverId() );
}
@Test
public void shouldDiscoverGreaterTermBasedLeaderStepdown() throws Exception
{
int originalCoreMembers = 3;
clusterRule.withNumberOfCoreMembers( originalCoreMembers );
Cluster cluster = clusterRule.startCluster();
CoreClusterMember leader = cluster.awaitLeader();
leader.config().augment( CausalClusteringSettings.refuse_to_be_leader, Settings.TRUE );
List<MemberInfo> preElectionOverview = clusterOverview( leader.database() );
CoreClusterMember follower = cluster.getMemberWithRole( Role.FOLLOWER );
follower.raft().triggerElection( Clock.systemUTC() );
assertEventualOverview( cluster, allOf(
containsRole( LEADER, 1 ),
containsRole( FOLLOWER, originalCoreMembers - 1 ),
not( equalTo( preElectionOverview ) ) ), leader.serverId() );
}
private void assertEventualOverview( Cluster cluster, Matcher<List<MemberInfo>> expected, int coreServerId )
throws KernelException, InterruptedException
{
Function<List<MemberInfo>, String> printableMemberInfos =
memberInfos -> memberInfos.stream().map( MemberInfo::toString ).collect( Collectors.joining( ", " ) );
assertEventually( memberInfos -> "should have overview from core " + coreServerId + " but view was " + printableMemberInfos.apply( memberInfos ),
() -> clusterOverview( cluster.getCoreMemberById( coreServerId ).database() ), expected, 90, SECONDS );
}
@SafeVarargs
private final Matcher<Iterable<? extends MemberInfo>> containsAllMemberAddresses(
Collection<? extends ClusterMember>... members )
{
return containsMemberAddresses( Stream.of( members).flatMap( Collection::stream ).collect( toList() ) );
}
private Matcher<Iterable<? extends MemberInfo>> containsMemberAddresses( Collection<? extends ClusterMember> members )
{
return containsInAnyOrder( members.stream().map( coreClusterMember ->
new TypeSafeMatcher<MemberInfo>()
{
@Override
protected boolean matchesSafely( MemberInfo item )
{
Set<String> addresses = asSet(item.addresses);
for ( URI uri : coreClusterMember.clientConnectorAddresses().uriList() )
{
if ( !addresses.contains( uri.toString() ) )
{
return false;
}
}
return true;
}
@Override
public void describeTo( Description description )
{
description.appendText( "MemberInfo with addresses: " )
.appendValue( coreClusterMember.clientConnectorAddresses().boltAddress() );
}
}
).collect( toList() ) );
}
private Matcher<List<MemberInfo>> containsRole( RoleInfo expectedRole, long expectedCount )
{
return new FeatureMatcher<List<MemberInfo>,Long>( equalTo( expectedCount ), expectedRole.name(), "count" )
{
@Override
protected Long featureValueOf( List<MemberInfo> overview )
{
return overview.stream().filter( info -> info.role == expectedRole ).count();
}
};
}
private Matcher<List<MemberInfo>> doesNotContainRole( RoleInfo unexpectedRole )
{
return containsRole( unexpectedRole, 0 );
}
@SuppressWarnings( "unchecked" )
private List<MemberInfo> clusterOverview( GraphDatabaseFacade db )
throws TransactionFailureException, ProcedureException
{
Kernel kernel = db.getDependencyResolver().resolveDependency( Kernel.class );
List<MemberInfo> infos = new ArrayList<>();
try ( Session session = kernel.beginSession( AnonymousContext.read() ); Transaction tx = session.beginTransaction( Type.implicit ) )
{
RawIterator<Object[],ProcedureException> itr =
tx.procedures().procedureCallRead( procedureName( "dbms", "cluster", ClusterOverviewProcedure.PROCEDURE_NAME ), null );
while ( itr.hasNext() )
{
Object[] row = itr.next();
List<String> addresses = (List<String>) row[1];
infos.add( new MemberInfo( addresses.toArray( new String[addresses.size()] ), RoleInfo.valueOf( (String) row[2] ) ) );
}
return infos;
}
}
private static class MemberInfo
{
private final String[] addresses;
private final RoleInfo role;
MemberInfo( String[] addresses, RoleInfo role )
{
this.addresses = addresses;
this.role = role;
}
@Override
public boolean equals( Object o )
{
if ( this == o )
{
return true;
}
if ( o == null || getClass() != o.getClass() )
{
return false;
}
MemberInfo that = (MemberInfo) o;
return Arrays.equals( addresses, that.addresses ) && role == that.role;
}
@Override
public int hashCode()
{
return Objects.hash( Arrays.hashCode( addresses ), role );
}
@Override
public String toString()
{
return String.format( "MemberInfo{addresses='%s', role=%s}", Arrays.toString( addresses ), role );
}
}
}