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CoreBootstrapperTest.java
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CoreBootstrapperTest.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j Enterprise Edition. The included source
* code can be redistributed and/or modified under the terms of the
* GNU AFFERO GENERAL PUBLIC LICENSE Version 3
* (http://www.fsf.org/licensing/licenses/agpl-3.0.html) with the
* Commons Clause, as found in the associated LICENSE.txt file.
*
* 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.
*
* Neo4j object code can be licensed independently from the source
* under separate terms from the AGPL. Inquiries can be directed to:
* licensing@neo4j.com
*
* More information is also available at:
* https://neo4j.com/licensing/
*/
package org.neo4j.causalclustering.core.state;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.RuleChain;
import java.io.File;
import java.io.IOException;
import java.util.Set;
import org.neo4j.causalclustering.core.replication.session.GlobalSessionTrackerState;
import org.neo4j.causalclustering.core.state.machines.id.IdAllocationState;
import org.neo4j.causalclustering.core.state.machines.locks.ReplicatedLockTokenState;
import org.neo4j.causalclustering.core.state.machines.tx.LastCommittedIndexFinder;
import org.neo4j.causalclustering.core.state.snapshot.CoreSnapshot;
import org.neo4j.causalclustering.core.state.snapshot.CoreStateType;
import org.neo4j.causalclustering.core.state.snapshot.RaftCoreState;
import org.neo4j.causalclustering.helpers.ClassicNeo4jStore;
import org.neo4j.causalclustering.identity.MemberId;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.impl.store.id.IdType;
import org.neo4j.kernel.impl.transaction.log.ReadOnlyTransactionIdStore;
import org.neo4j.kernel.impl.transaction.log.ReadOnlyTransactionStore;
import org.neo4j.kernel.monitoring.Monitors;
import org.neo4j.logging.AssertableLogProvider;
import org.neo4j.logging.NullLogProvider;
import org.neo4j.test.rule.PageCacheRule;
import org.neo4j.test.rule.TestDirectory;
import org.neo4j.test.rule.fs.DefaultFileSystemRule;
import static java.util.UUID.randomUUID;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
import static org.neo4j.helpers.collection.Iterators.asSet;
public class CoreBootstrapperTest
{
private final TestDirectory testDirectory = TestDirectory.testDirectory();
private final PageCacheRule pageCacheRule = new PageCacheRule();
private final DefaultFileSystemRule fileSystemRule = new DefaultFileSystemRule();
@Rule
public RuleChain ruleChain = RuleChain.outerRule( pageCacheRule )
.around( pageCacheRule ).around( testDirectory );
@Test
public void shouldSetAllCoreState() throws Exception
{
// given
int nodeCount = 100;
FileSystemAbstraction fileSystem = fileSystemRule.get();
File classicNeo4jStore = ClassicNeo4jStore.builder( testDirectory.directory(), fileSystem ).amountOfNodes( nodeCount ).build().getStoreDir();
PageCache pageCache = pageCacheRule.getPageCache( fileSystem );
CoreBootstrapper bootstrapper = new CoreBootstrapper( classicNeo4jStore, pageCache, fileSystem,
Config.defaults(), NullLogProvider.getInstance() );
// when
Set<MemberId> membership = asSet( randomMember(), randomMember(), randomMember() );
CoreSnapshot snapshot = bootstrapper.bootstrap( membership );
// then
assertEquals( nodeCount, ((IdAllocationState) snapshot.get( CoreStateType.ID_ALLOCATION ))
.firstUnallocated( IdType.NODE ) );
/* Bootstrapped state is created in RAFT land at index -1 and term -1. */
assertEquals( 0, snapshot.prevIndex() );
assertEquals( 0, snapshot.prevTerm() );
/* Lock is initially not taken. */
assertEquals( new ReplicatedLockTokenState(), snapshot.get( CoreStateType.LOCK_TOKEN ) );
/* Raft has the bootstrapped set of members initially. */
assertEquals( membership, ((RaftCoreState) snapshot.get( CoreStateType.RAFT_CORE_STATE )).committed().members() );
/* The session state is initially empty. */
assertEquals( new GlobalSessionTrackerState(), snapshot.get( CoreStateType.SESSION_TRACKER ) );
LastCommittedIndexFinder lastCommittedIndexFinder = new LastCommittedIndexFinder( new ReadOnlyTransactionIdStore( pageCache, classicNeo4jStore ), new ReadOnlyTransactionStore(
pageCache, fileSystem, classicNeo4jStore, new Monitors() ), NullLogProvider.getInstance() );
long lastCommittedIndex = lastCommittedIndexFinder.getLastCommittedIndex();
assertEquals( -1, lastCommittedIndex );
}
@Test
public void shouldFailToBootstrapIfClusterIsInNeedOfRecovery() throws IOException
{
// given
int nodeCount = 100;
FileSystemAbstraction fileSystem = fileSystemRule.get();
File storeInNeedOfRecovery = ClassicNeo4jStore.builder( testDirectory.directory(), fileSystem ).amountOfNodes( nodeCount ).needToRecover().build().getStoreDir();
AssertableLogProvider assertableLogProvider = new AssertableLogProvider();
PageCache pageCache = pageCacheRule.getPageCache( fileSystem );
CoreBootstrapper bootstrapper = new CoreBootstrapper( storeInNeedOfRecovery, pageCache, fileSystem,
Config.defaults(), assertableLogProvider );
// when
Set<MemberId> membership = asSet( randomMember(), randomMember(), randomMember() );
try
{
bootstrapper.bootstrap( membership );
fail( );
}
catch ( IllegalStateException e )
{
String errorMessage = "Cannot bootstrap. Recovery is required. Please ensure that the store being seeded comes from a cleanly shutdown " +
"instance of Neo4j or a Neo4j backup";
assertEquals( e.getMessage(), errorMessage );
assertableLogProvider.assertExactly( AssertableLogProvider.inLog( CoreBootstrapper.class ).error( errorMessage ) );
}
}
private MemberId randomMember()
{
return new MemberId( randomUUID() );
}
}