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Tests a few scenarios where the transaction log is left with garbage/partial stuff at the end.
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...ustering/src/test/java/org/neo4j/causalclustering/scenarios/TransactionLogRecoveryIT.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.scenarios; | ||
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| import org.junit.Before; | ||
| import org.junit.Rule; | ||
| import org.junit.Test; | ||
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| import java.io.File; | ||
| import java.io.IOException; | ||
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| import org.neo4j.causalclustering.discovery.Cluster; | ||
| import org.neo4j.causalclustering.discovery.CoreClusterMember; | ||
| import org.neo4j.causalclustering.discovery.ReadReplica; | ||
| import org.neo4j.io.fs.DefaultFileSystemAbstraction; | ||
| import org.neo4j.io.fs.FileSystemAbstraction; | ||
| import org.neo4j.kernel.impl.transaction.log.LogHeaderCache; | ||
| import org.neo4j.kernel.impl.transaction.log.PhysicalLogFile; | ||
| import org.neo4j.kernel.impl.transaction.log.PhysicalLogFiles; | ||
| import org.neo4j.kernel.impl.transaction.log.ReadOnlyLogVersionRepository; | ||
| import org.neo4j.kernel.impl.transaction.log.ReadOnlyTransactionIdStore; | ||
| import org.neo4j.kernel.impl.transaction.log.entry.LogEntryWriter; | ||
| import org.neo4j.kernel.lifecycle.Lifespan; | ||
| import org.neo4j.kernel.monitoring.Monitors; | ||
| import org.neo4j.test.causalclustering.ClusterRule; | ||
| import org.neo4j.test.rule.PageCacheRule; | ||
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| import static java.util.Collections.singletonList; | ||
| import static org.neo4j.causalclustering.core.EnterpriseCoreEditionModule.CLUSTER_STATE_DIRECTORY_NAME; | ||
| import static org.neo4j.causalclustering.discovery.Cluster.dataMatchesEventually; | ||
| import static org.neo4j.causalclustering.helpers.DataCreator.createNodes; | ||
|
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| /** | ||
| * Recovery scenarios where the transaction log was only partially written. | ||
| */ | ||
| public class TransactionLogRecoveryIT | ||
| { | ||
| @Rule | ||
| public final PageCacheRule pageCache = new PageCacheRule(); | ||
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| @Rule | ||
| public final ClusterRule clusterRule = new ClusterRule( getClass() ) | ||
| .withNumberOfCoreMembers( 3 ) | ||
| .withNumberOfReadReplicas( 3 ); | ||
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| private Cluster cluster; | ||
| private FileSystemAbstraction fs = new DefaultFileSystemAbstraction(); | ||
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| @Before | ||
| public void setup() throws Exception | ||
| { | ||
| cluster = clusterRule.startCluster(); | ||
| } | ||
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| @Test | ||
| public void coreShouldStartAfterPartialTransactionWriteCrash() throws Exception | ||
| { | ||
| // given: a fully synced cluster with some data | ||
| dataMatchesEventually( createNodes( cluster, 10 ), cluster.coreMembers() ); | ||
|
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| // when: shutting down a core | ||
| CoreClusterMember core = cluster.getCoreMemberById( 0 ); | ||
| core.shutdown(); | ||
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| // and making sure there will be something new to pull | ||
| CoreClusterMember lastWrites = createNodes( cluster, 10 ); | ||
|
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| // and writing a partial tx | ||
| writePartialTx( core.storeDir() ); | ||
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| // then: we should still be able to start | ||
| core.start(); | ||
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| // and become fully synced again | ||
| dataMatchesEventually( lastWrites, singletonList( core ) ); | ||
| } | ||
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| @Test | ||
| public void coreShouldStartWithSeedHavingPartialTransactionWriteCrash() throws Exception | ||
| { | ||
| // given: a fully synced cluster with some data | ||
| dataMatchesEventually( createNodes( cluster, 10 ), cluster.coreMembers() ); | ||
|
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| // when: shutting down a core | ||
| CoreClusterMember core = cluster.getCoreMemberById( 0 ); | ||
| core.shutdown(); | ||
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| // and making sure there will be something new to pull | ||
| CoreClusterMember lastWrites = createNodes( cluster, 10 ); | ||
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| // and writing a partial tx | ||
| writePartialTx( core.storeDir() ); | ||
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| // and deleting the cluster state, making sure a snapshot is required during startup | ||
| // effectively a seeding scenario -- representing the use of the unbind command on a crashed store | ||
| fs.deleteRecursively( new File( core.storeDir(), CLUSTER_STATE_DIRECTORY_NAME ) ); | ||
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| // then: we should still be able to start | ||
| core.start(); | ||
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| // and become fully synced again | ||
| dataMatchesEventually( lastWrites, singletonList( core ) ); | ||
| } | ||
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| @Test | ||
| public void readReplicaShouldStartAfterPartialTransactionWriteCrash() throws Exception | ||
| { | ||
| // given: a fully synced cluster with some data | ||
| dataMatchesEventually( createNodes( cluster, 10 ), cluster.readReplicas() ); | ||
|
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| // when: shutting down a read replica | ||
| ReadReplica readReplica = cluster.getReadReplicaById( 0 ); | ||
| readReplica.shutdown(); | ||
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| // and making sure there will be something new to pull | ||
| CoreClusterMember lastWrites = createNodes( cluster, 10 ); | ||
| dataMatchesEventually( lastWrites, cluster.coreMembers() ); | ||
|
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| // and writing a partial tx | ||
| writePartialTx( readReplica.storeDir() ); | ||
|
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| // then: we should still be able to start | ||
| readReplica.start(); | ||
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| // and become fully synced again | ||
| dataMatchesEventually( lastWrites, singletonList( readReplica ) ); | ||
| } | ||
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| private void writePartialTx( File storeDir ) throws IOException | ||
| { | ||
| PhysicalLogFiles logFiles = new PhysicalLogFiles( storeDir, fs ); | ||
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| ReadOnlyLogVersionRepository logVersionRepository = new ReadOnlyLogVersionRepository( pageCache.getPageCache( fs ), storeDir ); | ||
| ReadOnlyTransactionIdStore txIdStore = new ReadOnlyTransactionIdStore( pageCache.getPageCache( fs ), storeDir ); | ||
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| PhysicalLogFile logFile = new PhysicalLogFile( fs, logFiles, Long.MAX_VALUE /*don't rotate*/, | ||
| txIdStore::getLastCommittedTransactionId, logVersionRepository, | ||
| new Monitors().newMonitor( PhysicalLogFile.Monitor.class ), new LogHeaderCache( 10 ) ); | ||
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| try ( Lifespan ignored = new Lifespan( logFile ) ) | ||
| { | ||
| LogEntryWriter writer = new LogEntryWriter( logFile.getWriter() ); | ||
| writer.writeStartEntry( 0, 0, 0x123456789ABCDEFL, txIdStore.getLastCommittedTransactionId() + 1, new byte[]{0} ); | ||
| } | ||
| } | ||
| } |