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ApplyTransactionsCommand.java
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ApplyTransactionsCommand.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.tools.applytx;
import java.io.File;
import java.io.IOException;
import java.io.PrintStream;
import java.util.function.Supplier;
import org.neo4j.cursor.IOCursor;
import org.neo4j.graphdb.DependencyResolver;
import org.neo4j.helpers.Args;
import org.neo4j.helpers.ArrayUtil;
import org.neo4j.helpers.progress.ProgressListener;
import org.neo4j.io.fs.DefaultFileSystemAbstraction;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.io.pagecache.impl.muninn.StandalonePageCacheFactory;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.impl.api.TransactionRepresentationCommitProcess;
import org.neo4j.kernel.impl.api.TransactionToApply;
import org.neo4j.kernel.impl.transaction.CommittedTransactionRepresentation;
import org.neo4j.kernel.impl.transaction.TransactionRepresentation;
import org.neo4j.kernel.impl.transaction.log.LogicalTransactionStore;
import org.neo4j.kernel.impl.transaction.log.ReadOnlyTransactionStore;
import org.neo4j.kernel.impl.transaction.log.TransactionAppender;
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore;
import org.neo4j.kernel.internal.GraphDatabaseAPI;
import org.neo4j.kernel.lifecycle.LifeSupport;
import org.neo4j.kernel.monitoring.Monitors;
import org.neo4j.storageengine.api.StorageEngine;
import org.neo4j.tools.console.input.ArgsCommand;
import static java.lang.String.format;
import static org.neo4j.helpers.progress.ProgressMonitorFactory.textual;
import static org.neo4j.kernel.impl.transaction.tracing.CommitEvent.NULL;
import static org.neo4j.storageengine.api.TransactionApplicationMode.EXTERNAL;
public class ApplyTransactionsCommand extends ArgsCommand
{
private final File from;
private final Supplier<GraphDatabaseAPI> to;
public ApplyTransactionsCommand( File from, Supplier<GraphDatabaseAPI> to )
{
this.from = from;
this.to = to;
}
@Override
protected void run( Args args, PrintStream out ) throws Exception
{
TransactionIdStore txIdStore = to.get().getDependencyResolver().resolveDependency(
TransactionIdStore.class );
long fromTx = txIdStore.getLastCommittedTransaction().transactionId();
long toTx;
if ( args.orphans().isEmpty() )
{
throw new IllegalArgumentException( "No tx specified" );
}
String whereTo = args.orphans().get( 0 );
if ( whereTo.equals( "next" ) )
{
toTx = fromTx + 1;
}
else if ( whereTo.equals( "last" ) )
{
toTx = Long.MAX_VALUE;
}
else
{
toTx = Long.parseLong( whereTo );
}
long lastApplied = applyTransactions( from, to.get(), fromTx, toTx, out );
out.println( "Applied transactions up to and including " + lastApplied );
}
private long applyTransactions( File fromPath, GraphDatabaseAPI toDb, long fromTxExclusive, long toTxInclusive,
PrintStream out )
throws IOException, TransactionFailureException
{
DependencyResolver resolver = toDb.getDependencyResolver();
TransactionRepresentationCommitProcess commitProcess =
new TransactionRepresentationCommitProcess(
resolver.resolveDependency( TransactionAppender.class ),
resolver.resolveDependency( StorageEngine.class ) );
LifeSupport life = new LifeSupport();
try ( DefaultFileSystemAbstraction fileSystem = new DefaultFileSystemAbstraction();
PageCache pageCache = StandalonePageCacheFactory.createPageCache( fileSystem ) )
{
LogicalTransactionStore source = life.add(
new ReadOnlyTransactionStore( pageCache, fileSystem, fromPath, new Monitors() ) );
life.start();
long lastAppliedTx = fromTxExclusive;
// Some progress if there are more than a couple of transactions to apply
ProgressListener progress = toTxInclusive - fromTxExclusive >= 100 ?
textual( out ).singlePart( "Application progress",
toTxInclusive - fromTxExclusive ) :
ProgressListener.NONE;
try ( IOCursor<CommittedTransactionRepresentation> cursor = source.getTransactions( fromTxExclusive + 1 ) )
{
while ( cursor.next() )
{
CommittedTransactionRepresentation transaction = cursor.get();
TransactionRepresentation transactionRepresentation =
transaction.getTransactionRepresentation();
try
{
commitProcess.commit( new TransactionToApply( transactionRepresentation ), NULL, EXTERNAL );
progress.add( 1 );
}
catch ( final Throwable e )
{
System.err.println( "ERROR applying transaction " + transaction.getCommitEntry().getTxId() );
throw e;
}
lastAppliedTx = transaction.getCommitEntry().getTxId();
if ( lastAppliedTx == toTxInclusive )
{
break;
}
}
}
return lastAppliedTx;
}
finally
{
life.shutdown();
}
}
@Override
public String toString()
{
return ArrayUtil.join( new String[] {
"Applies transaction from the source onto the new db. Example:",
" apply last : applies transactions from the currently last applied and up to the last",
" transaction of source db",
" apply next : applies the next transaction onto the new db",
" apply 234 : applies up to and including tx 234 from the source db onto the new db" },
format( "%n" ) );
}
}