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HazelcastCoreTopologyService.java
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HazelcastCoreTopologyService.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.causalclustering.discovery;
import com.hazelcast.config.InterfacesConfig;
import com.hazelcast.config.JoinConfig;
import com.hazelcast.config.MemberAttributeConfig;
import com.hazelcast.config.NetworkConfig;
import com.hazelcast.config.TcpIpConfig;
import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastException;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.MemberAttributeEvent;
import com.hazelcast.core.MembershipEvent;
import com.hazelcast.core.MembershipListener;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import org.neo4j.causalclustering.core.CausalClusteringSettings;
import org.neo4j.causalclustering.helper.RobustJobSchedulerWrapper;
import org.neo4j.causalclustering.identity.ClusterId;
import org.neo4j.causalclustering.identity.MemberId;
import org.neo4j.graphdb.config.Setting;
import org.neo4j.helpers.AdvertisedSocketAddress;
import org.neo4j.helpers.ListenSocketAddress;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.impl.util.JobScheduler;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import static com.hazelcast.spi.properties.GroupProperty.INITIAL_MIN_CLUSTER_SIZE;
import static com.hazelcast.spi.properties.GroupProperty.LOGGING_TYPE;
import static com.hazelcast.spi.properties.GroupProperty.MERGE_FIRST_RUN_DELAY_SECONDS;
import static com.hazelcast.spi.properties.GroupProperty.MERGE_NEXT_RUN_DELAY_SECONDS;
import static com.hazelcast.spi.properties.GroupProperty.OPERATION_CALL_TIMEOUT_MILLIS;
import static com.hazelcast.spi.properties.GroupProperty.WAIT_SECONDS_BEFORE_JOIN;
import static org.neo4j.causalclustering.discovery.HazelcastClusterTopology.extractCatchupAddressesMap;
import static org.neo4j.causalclustering.discovery.HazelcastClusterTopology.getCoreTopology;
import static org.neo4j.causalclustering.discovery.HazelcastClusterTopology.getReadReplicaTopology;
import static org.neo4j.causalclustering.discovery.HazelcastClusterTopology.refreshTags;
class HazelcastCoreTopologyService extends LifecycleAdapter implements CoreTopologyService
{
private static final long HAZELCAST_IS_HEALTHY_TIMEOUT_MS = TimeUnit.MINUTES.toMillis( 10 );
private final Config config;
private final MemberId myself;
private final Log log;
private final Log userLog;
private final CoreTopologyListenerService listenerService;
private final RobustJobSchedulerWrapper scheduler;
private final long refreshPeriod;
private String membershipRegistrationId;
private JobScheduler.JobHandle refreshJob;
private HazelcastInstance hazelcastInstance;
private volatile ReadReplicaTopology readReplicaTopology = ReadReplicaTopology.EMPTY;
private volatile CoreTopology coreTopology = CoreTopology.EMPTY;
private volatile Map<MemberId,AdvertisedSocketAddress> catchupAddressMap = new HashMap<>();
HazelcastCoreTopologyService( Config config, MemberId myself, JobScheduler jobScheduler, LogProvider logProvider,
LogProvider userLogProvider )
{
this.config = config;
this.myself = myself;
this.listenerService = new CoreTopologyListenerService();
this.log = logProvider.getLog( getClass() );
this.scheduler = new RobustJobSchedulerWrapper( jobScheduler, log );
this.userLog = userLogProvider.getLog( getClass() );
this.refreshPeriod = config.get( CausalClusteringSettings.cluster_topology_refresh );
}
@Override
public void addCoreTopologyListener( Listener listener )
{
listenerService.addCoreTopologyListener( listener );
listener.onCoreTopologyChange( coreTopology );
}
@Override
public boolean setClusterId( ClusterId clusterId )
{
return HazelcastClusterTopology.casClusterId( hazelcastInstance, clusterId );
}
@Override
public void start() throws Throwable
{
log.info( "Cluster discovery service started" );
hazelcastInstance = createHazelcastInstance();
membershipRegistrationId = hazelcastInstance.getCluster().addMembershipListener( new OurMembershipListener() );
refreshJob = scheduler.scheduleRecurring( "TopologyRefresh", refreshPeriod, this::refreshTopology );
}
@Override
public void stop()
{
log.info( String.format( "HazelcastCoreTopologyService stopping and unbinding from %s",
config.get( CausalClusteringSettings.discovery_listen_address ) ) );
scheduler.cancelAndWaitTermination( refreshJob );
try
{
hazelcastInstance.getCluster().removeMembershipListener( membershipRegistrationId );
hazelcastInstance.getLifecycleService().terminate();
}
catch ( Throwable e )
{
log.warn( "Failed to stop Hazelcast", e );
}
}
private HazelcastInstance createHazelcastInstance()
{
System.setProperty( WAIT_SECONDS_BEFORE_JOIN.getName(), "1" );
JoinConfig joinConfig = new JoinConfig();
joinConfig.getMulticastConfig().setEnabled( false );
joinConfig.getAwsConfig().setEnabled( false );
TcpIpConfig tcpIpConfig = joinConfig.getTcpIpConfig();
tcpIpConfig.setEnabled( true );
List<AdvertisedSocketAddress> initialMembers = config.get( CausalClusteringSettings.initial_discovery_members );
for ( AdvertisedSocketAddress address : initialMembers )
{
tcpIpConfig.addMember( address.toString() );
}
Setting<ListenSocketAddress> discovery_listen_address = CausalClusteringSettings.discovery_listen_address;
ListenSocketAddress hazelcastAddress = config.get( discovery_listen_address );
InterfacesConfig interfaces = new InterfacesConfig();
interfaces.addInterface( hazelcastAddress.getHostname() );
NetworkConfig networkConfig = new NetworkConfig();
networkConfig.setInterfaces( interfaces );
networkConfig.setPort( hazelcastAddress.getPort() );
networkConfig.setJoin( joinConfig );
networkConfig.setPortAutoIncrement( false );
com.hazelcast.config.Config c = new com.hazelcast.config.Config();
c.setProperty( OPERATION_CALL_TIMEOUT_MILLIS.getName(), String.valueOf( 10_000 ) );
c.setProperty( MERGE_NEXT_RUN_DELAY_SECONDS.getName(), "10" );
c.setProperty( MERGE_FIRST_RUN_DELAY_SECONDS.getName(), "10" );
c.setProperty( INITIAL_MIN_CLUSTER_SIZE.getName(),
String.valueOf( minimumClusterSizeThatCanTolerateOneFaultForExpectedClusterSize() ) );
c.setProperty( LOGGING_TYPE.getName(), "none" );
c.setNetworkConfig( networkConfig );
MemberAttributeConfig memberAttributeConfig = HazelcastClusterTopology.buildMemberAttributesForCore( myself, config );
c.setMemberAttributeConfig( memberAttributeConfig );
logConnectionInfo( initialMembers );
JobScheduler.JobHandle logJob = scheduler.schedule( "HazelcastHealth", HAZELCAST_IS_HEALTHY_TIMEOUT_MS,
() -> log.warn( "The server has not been able to connect in a timely fashion to the " +
"cluster. Please consult the logs for more details. Rebooting the server may " +
"solve the problem." ) );
try
{
hazelcastInstance = Hazelcast.newHazelcastInstance( c );
logJob.cancel( true );
}
catch ( HazelcastException e )
{
String errorMessage = String.format( "Hazelcast was unable to start with setting: %s = %s",
discovery_listen_address.name(), config.get( discovery_listen_address ) );
userLog.error( errorMessage );
log.error( errorMessage, e );
throw new RuntimeException( e );
}
List<String> tags = config.get( CausalClusteringSettings.server_tags );
refreshTags( hazelcastInstance, myself.getUuid().toString(), tags );
return hazelcastInstance;
}
private void logConnectionInfo( List<AdvertisedSocketAddress> initialMembers )
{
userLog.info( "My connection info: " +
"[\n\tDiscovery: listen=%s, advertised=%s," +
"\n\tTransaction: listen=%s, advertised=%s, " +
"\n\tRaft: listen=%s, advertised=%s, " +
"\n\tClient Connector Addresses: %s" +
"\n]",
config.get( CausalClusteringSettings.discovery_listen_address ),
config.get( CausalClusteringSettings.discovery_advertised_address ),
config.get( CausalClusteringSettings.transaction_listen_address ),
config.get( CausalClusteringSettings.transaction_advertised_address ),
config.get( CausalClusteringSettings.raft_listen_address ),
config.get( CausalClusteringSettings.raft_advertised_address ),
ClientConnectorAddresses.extractFromConfig( config ) );
userLog.info( "Discovering cluster with initial members: " + initialMembers );
userLog.info( "Attempting to connect to the other cluster members before continuing..." );
}
private Integer minimumClusterSizeThatCanTolerateOneFaultForExpectedClusterSize()
{
return config.get( CausalClusteringSettings.expected_core_cluster_size ) / 2 + 1;
}
@Override
public CoreTopology coreServers()
{
return coreTopology;
}
@Override
public ReadReplicaTopology readReplicas()
{
return readReplicaTopology;
}
@Override
public Optional<AdvertisedSocketAddress> findCatchupAddress( MemberId memberId )
{
return Optional.ofNullable( catchupAddressMap.get( memberId ) );
}
private synchronized void refreshTopology()
{
refreshCoreTopology();
refreshReadReplicaTopology();
catchupAddressMap = extractCatchupAddressesMap( coreTopology, readReplicaTopology );
}
private void refreshCoreTopology()
{
CoreTopology newCoreTopology = getCoreTopology( hazelcastInstance, config, log );
CoreTopology.CoreTopologyDifference difference = coreTopology.difference( newCoreTopology );
if ( difference.hasChanges() )
{
log.info( "Core topology changed %s", difference );
}
coreTopology = newCoreTopology;
listenerService.notifyListeners( coreTopology );
}
private void refreshReadReplicaTopology()
{
ReadReplicaTopology newReadReplicaTopology = getReadReplicaTopology( hazelcastInstance, log );
ReadReplicaTopology.ReadReplicaTopologyDifference difference = readReplicaTopology.difference( newReadReplicaTopology );
if ( difference.hasChanges() )
{
log.info( "Read replica topology changed %s", difference );
}
this.readReplicaTopology = newReadReplicaTopology;
}
private class OurMembershipListener implements MembershipListener
{
@Override
public void memberAdded( MembershipEvent membershipEvent )
{
log.info( "Core member added %s", membershipEvent );
refreshTopology();
}
@Override
public void memberRemoved( MembershipEvent membershipEvent )
{
log.info( "Core member removed %s", membershipEvent );
refreshTopology();
}
@Override
public void memberAttributeChanged( MemberAttributeEvent memberAttributeEvent )
{
log.info( "Core member attribute changed %s", memberAttributeEvent );
}
}
}