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CoreServerModule.java
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CoreServerModule.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.core.server;
import java.io.File;
import java.util.function.Supplier;
import org.neo4j.backup.OnlineBackupKernelExtension;
import org.neo4j.backup.OnlineBackupSettings;
import org.neo4j.causalclustering.ReplicationModule;
import org.neo4j.causalclustering.catchup.CatchUpClient;
import org.neo4j.causalclustering.catchup.CatchupServer;
import org.neo4j.causalclustering.catchup.CheckpointerSupplier;
import org.neo4j.causalclustering.catchup.storecopy.CopiedStoreRecovery;
import org.neo4j.causalclustering.catchup.storecopy.LocalDatabase;
import org.neo4j.causalclustering.catchup.storecopy.RemoteStore;
import org.neo4j.causalclustering.catchup.storecopy.StoreCopyClient;
import org.neo4j.causalclustering.catchup.storecopy.StoreCopyProcess;
import org.neo4j.causalclustering.catchup.tx.TransactionLogCatchUpFactory;
import org.neo4j.causalclustering.catchup.tx.TxPullClient;
import org.neo4j.causalclustering.core.CausalClusteringSettings;
import org.neo4j.causalclustering.core.IdentityModule;
import org.neo4j.causalclustering.core.consensus.ConsensusModule;
import org.neo4j.causalclustering.core.consensus.ContinuousJob;
import org.neo4j.causalclustering.core.consensus.RaftMessages;
import org.neo4j.causalclustering.core.consensus.LeaderAvailabilityHandler;
import org.neo4j.causalclustering.core.consensus.RaftServer;
import org.neo4j.causalclustering.core.consensus.log.pruning.PruningScheduler;
import org.neo4j.causalclustering.core.consensus.membership.MembershipWaiter;
import org.neo4j.causalclustering.core.consensus.membership.MembershipWaiterLifecycle;
import org.neo4j.causalclustering.core.state.ClusteringModule;
import org.neo4j.causalclustering.core.state.CommandApplicationProcess;
import org.neo4j.causalclustering.core.state.CoreLife;
import org.neo4j.causalclustering.core.state.CoreSnapshotService;
import org.neo4j.causalclustering.core.state.CoreState;
import org.neo4j.causalclustering.core.state.LongIndexMarshal;
import org.neo4j.causalclustering.core.state.RaftLogPruner;
import org.neo4j.causalclustering.core.state.RaftMessageHandler;
import org.neo4j.causalclustering.core.state.machines.CoreStateMachinesModule;
import org.neo4j.causalclustering.core.state.snapshot.CoreStateDownloader;
import org.neo4j.causalclustering.core.state.snapshot.CoreStateDownloaderService;
import org.neo4j.causalclustering.core.state.storage.DurableStateStorage;
import org.neo4j.causalclustering.core.state.storage.StateStorage;
import org.neo4j.causalclustering.discovery.TopologyService;
import org.neo4j.causalclustering.identity.MemberId;
import org.neo4j.causalclustering.logging.MessageLogger;
import org.neo4j.causalclustering.messaging.CoreReplicatedContentMarshal;
import org.neo4j.causalclustering.messaging.LoggingInbound;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.kernel.NeoStoreDataSource;
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.transaction.log.LogicalTransactionStore;
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore;
import org.neo4j.kernel.impl.transaction.state.DataSourceManager;
import org.neo4j.kernel.impl.util.Dependencies;
import org.neo4j.kernel.impl.util.JobScheduler;
import org.neo4j.kernel.internal.DatabaseHealth;
import org.neo4j.kernel.lifecycle.LifeSupport;
import org.neo4j.kernel.monitoring.Monitors;
import org.neo4j.logging.LogProvider;
import org.neo4j.ssl.SslPolicy;
import org.neo4j.time.Clocks;
import static org.neo4j.kernel.impl.util.JobScheduler.SchedulingStrategy.NEW_THREAD;
public class CoreServerModule
{
public static final String CLUSTER_ID_NAME = "cluster-id";
public static final String LAST_FLUSHED_NAME = "last-flushed";
public final MembershipWaiterLifecycle membershipWaiterLifecycle;
public CoreServerModule( IdentityModule identityModule, final PlatformModule platformModule,
ConsensusModule consensusModule, CoreStateMachinesModule coreStateMachinesModule,
ReplicationModule replicationModule, File clusterStateDirectory, ClusteringModule clusteringModule,
LocalDatabase localDatabase, MessageLogger<MemberId> messageLogger,
Supplier<DatabaseHealth> dbHealthSupplier, SslPolicy sslPolicy )
{
final Dependencies dependencies = platformModule.dependencies;
final Config config = platformModule.config;
final LogService logging = platformModule.logging;
final FileSystemAbstraction fileSystem = platformModule.fileSystem;
final LifeSupport life = platformModule.life;
final Monitors monitors = platformModule.monitors;
final JobScheduler jobScheduler = platformModule.jobScheduler;
final TopologyService topologyService = clusteringModule.topologyService();
LogProvider logProvider = logging.getInternalLogProvider();
LogProvider userLogProvider = logging.getUserLogProvider();
final Supplier<DatabaseHealth> databaseHealthSupplier = dependencies.provideDependency( DatabaseHealth.class );
StateStorage<Long> lastFlushedStorage = life
.add( new DurableStateStorage<>( fileSystem, clusterStateDirectory, LAST_FLUSHED_NAME,
new LongIndexMarshal(), config.get( CausalClusteringSettings.last_flushed_state_size ),
logProvider ) );
consensusModule.raftMembershipManager().setRecoverFromIndexSupplier( lastFlushedStorage::getInitialState );
RaftServer raftServer = new RaftServer( new CoreReplicatedContentMarshal(), sslPolicy, config, logProvider,
userLogProvider, monitors );
LoggingInbound<RaftMessages.ClusterIdAwareMessage> loggingRaftInbound = new LoggingInbound<>( raftServer,
messageLogger, identityModule.myself() );
long inactivityTimeoutMillis = config.get( CausalClusteringSettings.catch_up_client_inactivity_timeout ).toMillis();
CatchUpClient catchUpClient = life
.add(new CatchUpClient( logProvider, Clocks.systemClock(), inactivityTimeoutMillis, monitors, sslPolicy ) );
RemoteStore remoteStore = new RemoteStore( logProvider, fileSystem, platformModule.pageCache, new StoreCopyClient( catchUpClient, logProvider ),
new TxPullClient( catchUpClient, platformModule.monitors ), new TransactionLogCatchUpFactory(), platformModule.monitors );
CopiedStoreRecovery copiedStoreRecovery = new CopiedStoreRecovery( config,
platformModule.kernelExtensions.listFactories(), platformModule.pageCache );
life.add( copiedStoreRecovery );
StoreCopyProcess storeCopyProcess = new StoreCopyProcess( fileSystem, platformModule.pageCache, localDatabase,
copiedStoreRecovery, remoteStore, logProvider );
LifeSupport servicesToStopOnStoreCopy = new LifeSupport();
if ( config.get( OnlineBackupSettings.online_backup_enabled ) )
{
platformModule.dataSourceManager.addListener( new DataSourceManager.Listener()
{
@Override
public void registered( NeoStoreDataSource dataSource )
{
servicesToStopOnStoreCopy.add( pickBackupExtension( dataSource ) );
}
@Override
public void unregistered( NeoStoreDataSource dataSource )
{
servicesToStopOnStoreCopy.remove( pickBackupExtension( dataSource ) );
}
private OnlineBackupKernelExtension pickBackupExtension( NeoStoreDataSource dataSource )
{
return dataSource.getDependencyResolver().resolveDependency( OnlineBackupKernelExtension.class );
}
} );
}
CoreState coreState = new CoreState( coreStateMachinesModule.coreStateMachines,
replicationModule.getSessionTracker(), lastFlushedStorage );
CommandApplicationProcess commandApplicationProcess = new CommandApplicationProcess(
consensusModule.raftLog(),
config.get( CausalClusteringSettings.state_machine_apply_max_batch_size ),
config.get( CausalClusteringSettings.state_machine_flush_window_size ), databaseHealthSupplier,
logProvider, replicationModule.getProgressTracker(),
replicationModule.getSessionTracker(), coreState, consensusModule.inFlightCache(),
platformModule.monitors );
dependencies.satisfyDependency( commandApplicationProcess ); // lastApplied() for CC-robustness
CoreSnapshotService snapshotService = new CoreSnapshotService( commandApplicationProcess,
coreState, consensusModule.raftLog(), consensusModule.raftMachine() );
CoreStateDownloader downloader = new CoreStateDownloader( localDatabase, servicesToStopOnStoreCopy,
remoteStore, catchUpClient, logProvider, storeCopyProcess, coreStateMachinesModule.coreStateMachines,
snapshotService, topologyService );
CoreStateDownloaderService downloadService = new CoreStateDownloaderService( platformModule
.jobScheduler, downloader, commandApplicationProcess, logProvider );
RaftMessageHandler messageHandler = new RaftMessageHandler( localDatabase, logProvider,
consensusModule.raftMachine(), downloadService, commandApplicationProcess );
int queueSize = config.get( CausalClusteringSettings.raft_in_queue_size );
int maxBatch = config.get( CausalClusteringSettings.raft_in_queue_max_batch );
BatchingMessageHandler batchingMessageHandler = new BatchingMessageHandler( messageHandler, queueSize, maxBatch,
logProvider );
LeaderAvailabilityHandler leaderAvailabilityHandler = new LeaderAvailabilityHandler( batchingMessageHandler, consensusModule.getLeaderAvailabilityTimers(),
consensusModule.raftMachine()::term, logProvider );
CoreLife coreLife = new CoreLife( consensusModule.raftMachine(), localDatabase,
clusteringModule.clusterBinder(), commandApplicationProcess,
coreStateMachinesModule.coreStateMachines, messageHandler, leaderAvailabilityHandler, snapshotService );
loggingRaftInbound.registerHandler( leaderAvailabilityHandler );
long electionTimeout = config.get( CausalClusteringSettings.leader_election_timeout ).toMillis();
MembershipWaiter membershipWaiter = new MembershipWaiter( identityModule.myself(), jobScheduler,
dbHealthSupplier, electionTimeout * 4, logProvider );
long joinCatchupTimeout = config.get( CausalClusteringSettings.join_catch_up_timeout ).toMillis();
membershipWaiterLifecycle = new MembershipWaiterLifecycle( membershipWaiter, joinCatchupTimeout,
consensusModule.raftMachine(), logProvider );
CatchupServer catchupServer = new CatchupServer( logProvider, userLogProvider, localDatabase::storeId,
platformModule.dependencies.provideDependency( TransactionIdStore.class ),
platformModule.dependencies.provideDependency( LogicalTransactionStore.class ),
localDatabase::dataSource, localDatabase::isAvailable, snapshotService, config, platformModule.monitors,
new CheckpointerSupplier( platformModule.dependencies ), fileSystem, platformModule.pageCache,
platformModule.storeCopyCheckPointMutex, sslPolicy );
RaftLogPruner raftLogPruner = new RaftLogPruner( consensusModule.raftMachine(), commandApplicationProcess );
dependencies.satisfyDependency( raftLogPruner );
life.add( new PruningScheduler( raftLogPruner, jobScheduler,
config.get( CausalClusteringSettings.raft_log_pruning_frequency ).toMillis(), logProvider ) );
// Exposes this so that tests can start/stop the catchup server
dependencies.satisfyDependency( catchupServer );
servicesToStopOnStoreCopy.add( catchupServer );
// batches messages from raft server -> core state
// core state will drop messages if not ready
life.add( batchingMessageHandler );
life.add( new ContinuousJob( jobScheduler, new JobScheduler.Group( "raft-batch-handler", NEW_THREAD ),
batchingMessageHandler, logProvider ) );
life.add( raftServer ); // must start before core state so that it can trigger snapshot downloads when necessary
life.add( coreLife );
life.add( catchupServer ); // must start last and stop first, since it handles external requests
life.add( downloadService );
}
}