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CoreToCoreCopySnapshotIT.java
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CoreToCoreCopySnapshotIT.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.scenarios;
import java.io.File;
import java.util.Map;
import java.util.SortedMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeoutException;
import org.junit.After;
import org.junit.Rule;
import org.junit.Test;
import org.neo4j.coreedge.discovery.Cluster;
import org.neo4j.coreedge.discovery.TestOnlyDiscoveryServiceFactory;
import org.neo4j.coreedge.raft.log.segmented.FileNames;
import org.neo4j.coreedge.raft.roles.Role;
import org.neo4j.coreedge.server.CoreEdgeClusterSettings;
import org.neo4j.coreedge.server.core.CoreGraphDatabase;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.io.fs.DefaultFileSystemAbstraction;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.impl.store.format.standard.StandardV3_0;
import org.neo4j.test.DbRepresentation;
import org.neo4j.test.rule.TargetDirectory;
import static java.util.Collections.emptyMap;
import static junit.framework.TestCase.assertEquals;
import static org.hamcrest.Matchers.greaterThan;
import static org.junit.Assert.assertThat;
import static org.neo4j.coreedge.raft.log.segmented.SegmentedRaftLog.SEGMENTED_LOG_DIRECTORY_NAME;
import static org.neo4j.coreedge.server.CoreEdgeClusterSettings.raft_log_pruning_frequency;
import static org.neo4j.coreedge.server.CoreEdgeClusterSettings.raft_log_pruning_strategy;
import static org.neo4j.coreedge.server.core.EnterpriseCoreEditionModule.CLUSTER_STATE_DIRECTORY_NAME;
import static org.neo4j.helpers.collection.MapUtil.stringMap;
public class CoreToCoreCopySnapshotIT
{
@Rule
public final TargetDirectory.TestDirectory dir = TargetDirectory.testDirForTest( getClass() );
private Cluster cluster;
private int TIMEOUT_MS = 5000;
@After
public void shutdown() throws ExecutionException, InterruptedException
{
if ( cluster != null )
{
cluster.shutdown();
cluster = null;
}
}
@Test
public void shouldBeAbleToDownloadFreshEmptySnapshot() throws Exception
{
// given
File dbDir = dir.directory();
cluster = Cluster.start( dbDir, 3, 0, new TestOnlyDiscoveryServiceFactory() );
CoreGraphDatabase leader = cluster.awaitLeader( TIMEOUT_MS );
// when
CoreGraphDatabase follower = cluster.awaitCoreGraphDatabaseWithRole( TIMEOUT_MS, Role.FOLLOWER );
follower.downloadSnapshot( leader.id().getCoreAddress() );
// then
assertEquals( DbRepresentation.of( leader ), DbRepresentation.of( follower ) );
}
@Test
public void shouldBeAbleToDownloadSmallFreshSnapshot() throws Exception
{
// given
File dbDir = dir.directory();
cluster = Cluster.start( dbDir, 3, 0, new TestOnlyDiscoveryServiceFactory() );
CoreGraphDatabase source = cluster.coreTx( ( db, tx ) -> {
Node node = db.createNode();
node.setProperty( "hej", "svej" );
tx.success();
} );
// when
CoreGraphDatabase follower = cluster.awaitCoreGraphDatabaseWithRole( TIMEOUT_MS, Role.FOLLOWER );
follower.downloadSnapshot( source.id().getCoreAddress() );
// then
assertEquals( DbRepresentation.of( source ), DbRepresentation.of( follower ) );
}
@Test
public void shouldBeAbleToDownloadLargerFreshSnapshot() throws Exception
{
// given
File dbDir = dir.directory();
cluster = Cluster.start( dbDir, 3, 0, new TestOnlyDiscoveryServiceFactory() );
CoreGraphDatabase source = cluster.coreTx( ( db, tx ) -> {
createData( db, 1000 );
tx.success();
} );
// when
CoreGraphDatabase follower = cluster.awaitCoreGraphDatabaseWithRole( TIMEOUT_MS, Role.FOLLOWER );
follower.downloadSnapshot( source.id().getCoreAddress() );
// then
assertEquals( DbRepresentation.of( source ), DbRepresentation.of( follower ) );
}
@Test
public void shouldBeAbleToDownloadToNewInstanceAfterPruning() throws Exception
{
// given
File dbDir = dir.directory();
Map<String,String> params = stringMap( CoreEdgeClusterSettings.state_machine_flush_window_size.name(), "1",
CoreEdgeClusterSettings.raft_log_pruning_strategy.name(), "3 entries",
CoreEdgeClusterSettings.raft_log_rotation_size.name(), "1K" );
cluster = Cluster.start( dbDir, 3, 0, params, new TestOnlyDiscoveryServiceFactory() );
CoreGraphDatabase leader = cluster.coreTx( ( db, tx ) -> {
createData( db, 10000 );
tx.success();
} );
// when
for ( CoreGraphDatabase coreDb : cluster.coreServers() )
{
coreDb.compact();
}
cluster.removeCoreServer( leader ); // to force a change of leader
leader = cluster.awaitLeader();
int newDbId = 3;
cluster.addCoreServerWithServerId( newDbId, 3 );
CoreGraphDatabase newDb = cluster.getCoreServerById( newDbId );
// then
assertEquals( DbRepresentation.of( leader ), DbRepresentation.of( newDb ) );
}
@Test
public void shouldBeAbleToDownloadToRejoinedInstanceAfterPruning() throws Exception
{
// given
File dbDir = dir.directory();
Map<String,String> coreParams = stringMap();
coreParams.put( raft_log_pruning_strategy.name(), "keep_none" );
coreParams.put( raft_log_pruning_frequency.name(), "100ms" );
int numberOfTransactions = 100;
//Start the cluster and accumulate some log files.
try ( Cluster cluster = Cluster
.start( dbDir, 3, 0, new TestOnlyDiscoveryServiceFactory(), coreParams, emptyMap(),
StandardV3_0.NAME ) )
{
CoreGraphDatabase leader = cluster.awaitCoreGraphDatabaseWithRole( TIMEOUT_MS, Role.LEADER );
int followersLastLog = getMostRecentLogIdOn( leader );
while ( followersLastLog < 2 )
{
doSomeTransactions( cluster, numberOfTransactions );
followersLastLog = getMostRecentLogIdOn( leader );
}
CoreGraphDatabase follower = cluster.awaitCoreGraphDatabaseWithRole( TIMEOUT_MS, Role.FOLLOWER );
follower.shutdown();
Config config = follower.getDependencyResolver().resolveDependency( Config.class );
/**
* After a follower is shutdown, wait until we accumulate some logs such that the oldest log is older than
* the most recent log when the follower was removed. We can then be sure that the follower won't be able
* to catch up to the leader without a snapshot.
*/
//when
int leadersOldestLog = getOldestLogIdOn( leader );
while ( leadersOldestLog < followersLastLog + 10 )
{
doSomeTransactions( cluster, numberOfTransactions );
leadersOldestLog = getOldestLogIdOn( leader );
}
//then
assertThat( leadersOldestLog, greaterThan( followersLastLog ) );
//The cluster member should join. Otherwise this line will hang forever.
cluster.addCoreServerWithServerId( config.get( CoreEdgeClusterSettings.server_id ), 3 );
}
}
static void createData( GraphDatabaseService db, int size )
{
for ( int i = 0; i < size; i++ )
{
Node node1 = db.createNode();
Node node2 = db.createNode();
node1.setProperty( "hej", "svej" );
node2.setProperty( "tjabba", "tjena" );
Relationship rel = node1.createRelationshipTo( node2, RelationshipType.withName( "halla" ) );
rel.setProperty( "this", "that" );
}
}
private Integer getOldestLogIdOn( CoreGraphDatabase clusterMember ) throws TimeoutException
{
return getLogFileNames( clusterMember ).firstKey().intValue();
}
private Integer getMostRecentLogIdOn( CoreGraphDatabase clusterMember ) throws TimeoutException
{
return getLogFileNames( clusterMember ).lastKey().intValue();
}
private SortedMap<Long,File> getLogFileNames( CoreGraphDatabase clusterMember )
{
File clusterDir = new File( clusterMember.getStoreDir(), CLUSTER_STATE_DIRECTORY_NAME );
File logFilesDir = new File( clusterDir, SEGMENTED_LOG_DIRECTORY_NAME );
return new FileNames( logFilesDir ).getAllFiles( new DefaultFileSystemAbstraction(), null );
}
private void doSomeTransactions( Cluster cluster, int count )
{
try
{
for ( int i = 0; i < count; i++ )
{
cluster.coreTx( ( db, tx ) -> {
Node node = db.createNode();
node.setProperty( "that's a bam", string( 1024 ) );
tx.success();
} );
}
}
catch ( Exception e )
{
throw new RuntimeException( e );
}
}
private String string( int numberOfCharacters )
{
StringBuilder s = new StringBuilder();
for ( int i = 0; i < numberOfCharacters; i++ )
{
s.append( String.valueOf( i ) );
}
return s.toString();
}
}