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ConsensusModule.java
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ConsensusModule.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.coreedge.core.consensus;
import java.io.File;
import java.io.IOException;
import org.neo4j.coreedge.core.CoreEdgeClusterSettings;
import org.neo4j.coreedge.core.EnterpriseCoreEditionModule;
import org.neo4j.coreedge.core.consensus.log.InMemoryRaftLog;
import org.neo4j.coreedge.core.consensus.log.MonitoredRaftLog;
import org.neo4j.coreedge.core.consensus.log.RaftLog;
import org.neo4j.coreedge.core.consensus.log.RaftLogEntry;
import org.neo4j.coreedge.core.consensus.log.segmented.InFlightMap;
import org.neo4j.coreedge.core.consensus.log.segmented.SegmentedRaftLog;
import org.neo4j.coreedge.core.consensus.membership.MemberIdSetBuilder;
import org.neo4j.coreedge.core.consensus.membership.RaftMembershipManager;
import org.neo4j.coreedge.core.consensus.membership.RaftMembershipState;
import org.neo4j.coreedge.core.consensus.schedule.DelayedRenewableTimeoutService;
import org.neo4j.coreedge.core.consensus.shipping.RaftLogShippingManager;
import org.neo4j.coreedge.core.consensus.term.MonitoredTermStateStorage;
import org.neo4j.coreedge.core.consensus.term.TermState;
import org.neo4j.coreedge.core.consensus.vote.VoteState;
import org.neo4j.coreedge.core.replication.SendToMyself;
import org.neo4j.coreedge.core.state.storage.DurableStateStorage;
import org.neo4j.coreedge.core.state.storage.StateStorage;
import org.neo4j.coreedge.discovery.CoreTopologyService;
import org.neo4j.coreedge.discovery.RaftDiscoveryServiceConnector;
import org.neo4j.coreedge.identity.MemberId;
import org.neo4j.coreedge.messaging.CoreReplicatedContentMarshal;
import org.neo4j.coreedge.messaging.Outbound;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.impl.factory.PlatformModule;
import org.neo4j.kernel.impl.logging.LogService;
import org.neo4j.kernel.impl.util.JobScheduler;
import org.neo4j.kernel.lifecycle.LifeSupport;
import org.neo4j.kernel.lifecycle.Lifecycle;
import org.neo4j.logging.LogProvider;
import static java.time.Clock.systemUTC;
public class ConsensusModule
{
public static final String RAFT_MEMBERSHIP_NAME = "membership";
public static final String RAFT_TERM_NAME = "term";
public static final String RAFT_VOTE_NAME = "vote";
private final MonitoredRaftLog raftLog;
private final RaftMachine raftMachine;
private final DelayedRenewableTimeoutService raftTimeoutService;
private final RaftMembershipManager raftMembershipManager;
private final InFlightMap<Long,RaftLogEntry> inFlightMap = new InFlightMap<>();
public ConsensusModule( MemberId myself, final PlatformModule platformModule, Outbound<MemberId,RaftMessages.RaftMessage> outbound,
File clusterStateDirectory, CoreTopologyService discoveryService )
{
final Config config = platformModule.config;
final LogService logging = platformModule.logging;
final FileSystemAbstraction fileSystem = platformModule.fileSystem;
final LifeSupport life = platformModule.life;
LogProvider logProvider = logging.getInternalLogProvider();
final CoreReplicatedContentMarshal marshal = new CoreReplicatedContentMarshal();
RaftLog underlyingLog = createRaftLog( config, life, fileSystem, clusterStateDirectory, marshal, logProvider, platformModule.jobScheduler );
raftLog = new MonitoredRaftLog( underlyingLog, platformModule.monitors );
StateStorage<TermState> termState;
StateStorage<VoteState> voteState;
StateStorage<RaftMembershipState> raftMembershipStorage;
try
{
StateStorage<TermState> durableTermState = life.add(
new DurableStateStorage<>( fileSystem, clusterStateDirectory, RAFT_TERM_NAME,
new TermState.Marshal(), config.get( CoreEdgeClusterSettings.term_state_size ), logProvider ) );
termState = new MonitoredTermStateStorage( durableTermState, platformModule.monitors );
voteState = life.add(
new DurableStateStorage<>( fileSystem, clusterStateDirectory, RAFT_VOTE_NAME,
new VoteState.Marshal( new MemberId.MemberIdMarshal() ),
config.get( CoreEdgeClusterSettings.vote_state_size ), logProvider ) );
raftMembershipStorage = life.add(
new DurableStateStorage<>( fileSystem, clusterStateDirectory, RAFT_MEMBERSHIP_NAME,
new RaftMembershipState.Marshal(), config.get( CoreEdgeClusterSettings.raft_membership_state_size ),
logProvider ) );
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
long electionTimeout = config.get( CoreEdgeClusterSettings.leader_election_timeout );
long heartbeatInterval = electionTimeout / 3;
Integer expectedClusterSize = config.get( CoreEdgeClusterSettings.expected_core_cluster_size );
MemberIdSetBuilder memberSetBuilder = new MemberIdSetBuilder();
SendToMyself leaderOnlyReplicator = new SendToMyself( myself, outbound );
raftMembershipManager = new RaftMembershipManager( leaderOnlyReplicator, memberSetBuilder, raftLog, logProvider,
expectedClusterSize, electionTimeout, systemUTC(),
config.get( CoreEdgeClusterSettings.join_catch_up_timeout ), raftMembershipStorage
);
life.add( raftMembershipManager );
RaftLogShippingManager logShipping =
new RaftLogShippingManager( outbound, logProvider, raftLog, systemUTC(),
myself, raftMembershipManager, electionTimeout,
config.get( CoreEdgeClusterSettings.catchup_batch_size ),
config.get( CoreEdgeClusterSettings.log_shipping_max_lag ), inFlightMap );
raftTimeoutService = new DelayedRenewableTimeoutService( systemUTC(), logProvider );
raftMachine =
new RaftMachine( myself, termState, voteState, raftLog, electionTimeout,
heartbeatInterval, raftTimeoutService, outbound, logProvider, raftMembershipManager,
logShipping, inFlightMap, platformModule.monitors );
life.add( new RaftDiscoveryServiceConnector( discoveryService, raftMachine ) );
life.add(logShipping);
}
private RaftLog createRaftLog( Config config, LifeSupport life, FileSystemAbstraction fileSystem,
File clusterStateDirectory, CoreReplicatedContentMarshal marshal, LogProvider logProvider, JobScheduler scheduler )
{
EnterpriseCoreEditionModule.RaftLogImplementation raftLogImplementation =
EnterpriseCoreEditionModule.RaftLogImplementation.valueOf( config.get( CoreEdgeClusterSettings.raft_log_implementation ) );
switch ( raftLogImplementation )
{
case IN_MEMORY:
{
return new InMemoryRaftLog();
}
case SEGMENTED:
{
long rotateAtSize = config.get( CoreEdgeClusterSettings.raft_log_rotation_size );
int readerPoolSize = config.get( CoreEdgeClusterSettings.raft_log_reader_pool_size );
String pruningStrategyConfig = config.get( CoreEdgeClusterSettings.raft_log_pruning_strategy );
return life.add( new SegmentedRaftLog(
fileSystem,
new File( clusterStateDirectory, RaftLog.PHYSICAL_LOG_DIRECTORY_NAME ),
rotateAtSize,
marshal,
logProvider,
pruningStrategyConfig,
readerPoolSize, systemUTC(), scheduler ) );
}
default:
throw new IllegalStateException( "Unknown raft log implementation: " + raftLogImplementation );
}
}
public RaftLog raftLog()
{
return raftLog;
}
public RaftMachine raftMachine()
{
return raftMachine;
}
public Lifecycle raftTimeoutService()
{
return raftTimeoutService;
}
public RaftMembershipManager raftMembershipManager()
{
return raftMembershipManager;
}
public InFlightMap<Long,RaftLogEntry> inFlightMap()
{
return inFlightMap;
}
}