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RaftLogDurabilityTest.java
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RaftLogDurabilityTest.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.raft.log;
import java.io.File;
import java.io.IOException;
import org.junit.Test;
import org.neo4j.coreedge.raft.ReplicatedInteger;
import org.neo4j.coreedge.raft.ReplicatedString;
import org.neo4j.graphdb.mockfs.EphemeralFileSystemAbstraction;
import org.neo4j.logging.NullLogProvider;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
public class RaftLogDurabilityTest
{
public RaftLog createRaftLog( EphemeralFileSystemAbstraction fileSystem )
{
File directory = new File( "raft-log" );
fileSystem.mkdir( directory );
return new NaiveDurableRaftLog( fileSystem, directory, new DummyRaftableContentSerializer(),
NullLogProvider.getInstance() );
}
@Test
public void shouldAppendDataAndNotCommitImmediately() throws Exception
{
EphemeralFileSystemAbstraction fileSystem = new EphemeralFileSystemAbstraction();
RaftLog log = createRaftLog( fileSystem );
final RaftLogEntry logEntry = new RaftLogEntry( 1, ReplicatedInteger.valueOf( 1 ) );
log.append( logEntry );
verifyCurrentLogAndNewLogLoadedFromFileSystem( log, fileSystem, myLog -> {
assertThat( myLog.appendIndex(), is( 0L ) );
assertThat( myLog.commitIndex(), is( -1L ) );
assertThat( myLog.readLogEntry( 0 ), equalTo( logEntry ) );
} );
}
@Test
public void shouldAppendAndCommit() throws Exception
{
EphemeralFileSystemAbstraction fileSystem = new EphemeralFileSystemAbstraction();
RaftLog log = createRaftLog( fileSystem );
RaftLogEntry logEntry = new RaftLogEntry( 1, ReplicatedInteger.valueOf( 1 ) );
log.append( logEntry );
log.commit( 0 );
verifyCurrentLogAndNewLogLoadedFromFileSystem( log, fileSystem, myLog -> {
assertThat( myLog.appendIndex(), is( 0L ) );
assertThat( myLog.commitIndex(), is( 0L ) );
} );
}
@Test
public void shouldAppendAfterReloadingFromFileSystem() throws Exception
{
EphemeralFileSystemAbstraction fileSystem = new EphemeralFileSystemAbstraction();
RaftLog log = createRaftLog( fileSystem );
RaftLogEntry logEntryA = new RaftLogEntry( 1, ReplicatedInteger.valueOf( 1 ) );
log.append( logEntryA );
fileSystem.crash();
log = createRaftLog( fileSystem );
RaftLogEntry logEntryB = new RaftLogEntry( 1, ReplicatedInteger.valueOf( 2 ) );
log.append( logEntryB );
assertThat( log.appendIndex(), is( 1L ) );
assertThat( log.readLogEntry( 0 ), is( logEntryA ) );
assertThat( log.readLogEntry( 1 ), is( logEntryB ) );
}
@Test
public void shouldTruncatePreviouslyAppendedEntries() throws Exception
{
EphemeralFileSystemAbstraction fileSystem = new EphemeralFileSystemAbstraction();
RaftLog log = createRaftLog( fileSystem );
RaftLogEntry logEntryA = new RaftLogEntry( 1, ReplicatedInteger.valueOf( 1 ) );
RaftLogEntry logEntryB = new RaftLogEntry( 1, ReplicatedInteger.valueOf( 2 ) );
log.append( logEntryA );
log.append( logEntryB );
log.truncate( 1 );
verifyCurrentLogAndNewLogLoadedFromFileSystem( log, fileSystem, myLog -> {
assertThat( myLog.appendIndex(), is( 0L ) );
} );
}
@Test
public void shouldReplacePreviouslyAppendedEntries() throws Exception
{
EphemeralFileSystemAbstraction fileSystem = new EphemeralFileSystemAbstraction();
RaftLog log = createRaftLog( fileSystem );
final RaftLogEntry logEntryA = new RaftLogEntry( 1, ReplicatedInteger.valueOf( 1 ) );
final RaftLogEntry logEntryB = new RaftLogEntry( 1, ReplicatedInteger.valueOf( 2 ) );
final RaftLogEntry logEntryC = new RaftLogEntry( 1, ReplicatedInteger.valueOf( 3 ) );
final RaftLogEntry logEntryD = new RaftLogEntry( 1, ReplicatedInteger.valueOf( 4 ) );
final RaftLogEntry logEntryE = new RaftLogEntry( 1, ReplicatedInteger.valueOf( 5 ) );
log.append( logEntryA );
log.append( logEntryB );
log.append( logEntryC );
log.truncate( 1 );
log.append( logEntryD );
log.append( logEntryE );
verifyCurrentLogAndNewLogLoadedFromFileSystem( log, fileSystem, myLog -> {
assertThat( myLog.appendIndex(), is( 2L ) );
assertThat( myLog.readLogEntry( 0 ), equalTo( logEntryA ) );
assertThat( myLog.readLogEntry( 1 ), equalTo( logEntryD ) );
assertThat( myLog.readLogEntry( 2 ), equalTo( logEntryE ) );
} );
}
@Test
public void shouldLogDifferentContentTypes() throws Exception
{
EphemeralFileSystemAbstraction fileSystem = new EphemeralFileSystemAbstraction();
RaftLog log = createRaftLog( fileSystem );
final RaftLogEntry logEntryA = new RaftLogEntry( 1, ReplicatedInteger.valueOf( 1 ) );
final RaftLogEntry logEntryB = new RaftLogEntry( 1, ReplicatedString.valueOf( "hejzxcjkzhxcjkxz" ) );
log.append( logEntryA );
log.append( logEntryB );
verifyCurrentLogAndNewLogLoadedFromFileSystem( log, fileSystem, myLog -> {
assertThat( myLog.appendIndex(), is( 1L ) );
assertThat( myLog.readLogEntry( 0 ), equalTo( logEntryA ) );
assertThat( myLog.readLogEntry( 1 ), equalTo( logEntryB ) );
} );
}
private void verifyCurrentLogAndNewLogLoadedFromFileSystem(
RaftLog log, EphemeralFileSystemAbstraction fileSystem, LogVerifier logVerifier ) throws IOException
{
logVerifier.verifyLog( log );
logVerifier.verifyLog( createRaftLog( fileSystem ) );
fileSystem.crash();
logVerifier.verifyLog( createRaftLog( fileSystem ) );
}
private interface LogVerifier
{
void verifyLog( RaftLog log ) throws IOException;
}
}