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Adds tool for building db from transaction logs of other db
As part of this commit also introduces a generic ConsoleInput utility which should help building other tools as well.
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tools/src/main/java/org/neo4j/tools/applytx/ApplyTransactionsCommand.java
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| /* | ||
| * Copyright (c) 2002-2015 "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 org.neo4j.graphdb.DependencyResolver; | ||
| import org.neo4j.helpers.Args; | ||
| import org.neo4j.helpers.ArrayUtil; | ||
| import org.neo4j.helpers.Provider; | ||
| import org.neo4j.helpers.progress.ProgressListener; | ||
| import org.neo4j.io.fs.DefaultFileSystemAbstraction; | ||
| import org.neo4j.io.pagecache.PageCache; | ||
| import org.neo4j.kernel.GraphDatabaseAPI; | ||
| import org.neo4j.kernel.KernelHealth; | ||
| import org.neo4j.kernel.api.exceptions.TransactionFailureException; | ||
| import org.neo4j.kernel.api.labelscan.LabelScanStore; | ||
| import org.neo4j.kernel.impl.api.BatchingTransactionRepresentationStoreApplier; | ||
| import org.neo4j.kernel.impl.api.LegacyIndexApplierLookup; | ||
| import org.neo4j.kernel.impl.api.TransactionRepresentationCommitProcess; | ||
| import org.neo4j.kernel.impl.api.index.IndexUpdatesValidator; | ||
| import org.neo4j.kernel.impl.api.index.IndexingService; | ||
| import org.neo4j.kernel.impl.core.CacheAccessBackDoor; | ||
| import org.neo4j.kernel.impl.index.IndexConfigStore; | ||
| import org.neo4j.kernel.impl.locking.LockGroup; | ||
| import org.neo4j.kernel.impl.locking.LockService; | ||
| import org.neo4j.kernel.impl.pagecache.StandalonePageCacheFactory; | ||
| import org.neo4j.kernel.impl.transaction.CommittedTransactionRepresentation; | ||
| import org.neo4j.kernel.impl.transaction.log.IOCursor; | ||
| import org.neo4j.kernel.impl.transaction.log.LogicalTransactionStore; | ||
| import org.neo4j.kernel.impl.transaction.log.ReadOnlyTransactionStore; | ||
| import org.neo4j.kernel.impl.transaction.log.TransactionIdStore; | ||
| import org.neo4j.kernel.impl.transaction.state.NeoStoreProvider; | ||
| import org.neo4j.kernel.impl.transaction.tracing.CommitEvent; | ||
| import org.neo4j.kernel.impl.util.IdOrderingQueue; | ||
| import org.neo4j.kernel.lifecycle.LifeSupport; | ||
| import org.neo4j.kernel.monitoring.Monitors; | ||
| 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.api.TransactionApplicationMode.RECOVERY; | ||
|
|
||
| public class ApplyTransactionsCommand extends ArgsCommand | ||
| { | ||
| private final File from; | ||
| private final Provider<GraphDatabaseAPI> to; | ||
|
|
||
| public ApplyTransactionsCommand( File from, Provider<GraphDatabaseAPI> to ) | ||
| { | ||
| this.from = from; | ||
| this.to = to; | ||
| } | ||
|
|
||
| @Override | ||
| protected void run( Args args, PrintStream out ) throws Exception | ||
| { | ||
| TransactionIdStore txIdStore = to.instance().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.instance(), 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(); | ||
| BatchingTransactionRepresentationStoreApplier applier = new BatchingTransactionRepresentationStoreApplier( | ||
| resolver.resolveDependency( IndexingService.class ), | ||
| resolver.resolveDependency( LabelScanStore.class ), | ||
| resolver.resolveDependency( NeoStoreProvider.class ).evaluate(), | ||
| resolver.resolveDependency( CacheAccessBackDoor.class ), | ||
| resolver.resolveDependency( LockService.class ), | ||
| resolver.resolveDependency( LegacyIndexApplierLookup.class ), | ||
| resolver.resolveDependency( IndexConfigStore.class ), | ||
| resolver.resolveDependency( KernelHealth.class ), | ||
| resolver.resolveDependency( IdOrderingQueue.class ) ); | ||
| TransactionRepresentationCommitProcess commitProcess = | ||
| new TransactionRepresentationCommitProcess( | ||
| resolver.resolveDependency( LogicalTransactionStore.class ), | ||
| resolver.resolveDependency( NeoStoreProvider.class ).evaluate(), | ||
| applier, | ||
| resolver.resolveDependency( IndexUpdatesValidator.class ) ); | ||
| LifeSupport life = new LifeSupport(); | ||
| DefaultFileSystemAbstraction fileSystem = new DefaultFileSystemAbstraction(); | ||
| try ( PageCache pageCache = StandalonePageCacheFactory.createPageCache( fileSystem ) ) | ||
| { | ||
| LogicalTransactionStore source = life.add( new ReadOnlyTransactionStore( fileSystem, fromPath, | ||
| new Monitors(), resolver.resolveDependency( KernelHealth.class ) ) ); | ||
| 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(); | ||
| try ( LockGroup locks = new LockGroup() ) | ||
| { | ||
| commitProcess.commit( transaction.getTransactionRepresentation(), locks, | ||
| CommitEvent.NULL, RECOVERY ); | ||
| 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; | ||
| } | ||
| } | ||
| } | ||
| applier.closeBatch(); | ||
| 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" ) ); | ||
| } | ||
| } |
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