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Count rebuilding as separate migration participant
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169
...kernel/src/main/java/org/neo4j/kernel/impl/storemigration/participant/CountsMigrator.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 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 General Public License for more details. | |||
| * | |||
| * You should have received a copy of the GNU General Public License | |||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | |||
| */ | |||
| package org.neo4j.kernel.impl.storemigration.participant; | |||
|
|
|||
| import java.io.File; | |||
| import java.io.IOException; | |||
|
|
|||
| import org.neo4j.helpers.collection.Iterables; | |||
| import org.neo4j.io.fs.FileSystemAbstraction; | |||
| import org.neo4j.io.pagecache.PageCache; | |||
| import org.neo4j.kernel.configuration.Config; | |||
| import org.neo4j.kernel.impl.logging.LogService; | |||
| import org.neo4j.kernel.impl.store.CountsComputer; | |||
| import org.neo4j.kernel.impl.store.MetaDataStore; | |||
| import org.neo4j.kernel.impl.store.MetaDataStore.Position; | |||
| import org.neo4j.kernel.impl.store.NeoStores; | |||
| import org.neo4j.kernel.impl.store.NodeStore; | |||
| import org.neo4j.kernel.impl.store.RelationshipStore; | |||
| import org.neo4j.kernel.impl.store.StoreFactory; | |||
| import org.neo4j.kernel.impl.store.StoreFailureException; | |||
| import org.neo4j.kernel.impl.store.StoreFile; | |||
| import org.neo4j.kernel.impl.store.StoreType; | |||
| import org.neo4j.kernel.impl.store.counts.CountsTracker; | |||
| import org.neo4j.kernel.impl.store.format.RecordFormats; | |||
| import org.neo4j.kernel.impl.store.format.StoreVersion; | |||
| import org.neo4j.kernel.impl.store.format.standard.StandardV2_3; | |||
| import org.neo4j.kernel.impl.store.format.standard.StandardV3_0; | |||
| import org.neo4j.kernel.impl.storemigration.ExistingTargetStrategy; | |||
| import org.neo4j.kernel.impl.storemigration.StoreFileType; | |||
| import org.neo4j.kernel.impl.storemigration.StoreUpgrader; | |||
| import org.neo4j.kernel.impl.storemigration.monitoring.MigrationProgressMonitor; | |||
| import org.neo4j.kernel.lifecycle.Lifespan; | |||
| import org.neo4j.logging.NullLogProvider; | |||
|
|
|||
| import static org.neo4j.kernel.impl.store.MetaDataStore.DEFAULT_NAME; | |||
| import static org.neo4j.kernel.impl.store.format.RecordFormatSelector.selectForVersion; | |||
| import static org.neo4j.kernel.impl.storemigration.FileOperation.DELETE; | |||
| import static org.neo4j.kernel.impl.storemigration.FileOperation.MOVE; | |||
|
|
|||
| /** | |||
| * Rebuilds the count store during migration. | |||
| * <p> | |||
| * Since the database may or may not reside in the upgrade directory, depending on whether the new format has | |||
| * different capabilities or not, we rebuild the count store in the store directory if we fail to open the store in | |||
| * the upgrade directory | |||
| * <p> | |||
| * Just one out of many potential participants in a {@link StoreUpgrader migration}. | |||
| * | |||
| * @see StoreUpgrader | |||
| */ | |||
| public class CountsMigrator extends AbstractStoreMigrationParticipant | |||
| { | |||
|
|
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| public static final Iterable<StoreFile> COUNTS_STORE_FILES = Iterables | |||
| .iterable( StoreFile.COUNTS_STORE_LEFT, StoreFile.COUNTS_STORE_RIGHT ); | |||
| private final Config config; | |||
| private final LogService logService; | |||
| private final FileSystemAbstraction fileSystem; | |||
| private final PageCache pageCache; | |||
|
|
|||
| public CountsMigrator( FileSystemAbstraction fileSystem, PageCache pageCache, Config config, LogService logService ) | |||
| { | |||
| super( "Count rebuilding" ); | |||
| this.fileSystem = fileSystem; | |||
| this.pageCache = pageCache; | |||
| this.config = config; | |||
| this.logService = logService; | |||
| } | |||
|
|
|||
| @Override | |||
| public void migrate( File storeDir, File migrationDir, MigrationProgressMonitor.Section progressMonitor, | |||
| String versionToMigrateFrom, String versionToMigrateTo ) throws IOException | |||
| { | |||
| if ( countStoreRebuildRequired( versionToMigrateFrom ) ) | |||
| { | |||
| // create counters from scratch | |||
| StoreFile.fileOperation( DELETE, fileSystem, migrationDir, migrationDir, COUNTS_STORE_FILES, true, null, | |||
| StoreFileType.STORE ); | |||
| File neoStore = new File( storeDir, DEFAULT_NAME ); | |||
| long lastTxId = MetaDataStore.getRecord( pageCache, neoStore, Position.LAST_TRANSACTION_ID ); | |||
| try | |||
| { | |||
| rebuildCountsFromScratch( migrationDir, lastTxId, progressMonitor, versionToMigrateTo, pageCache ); | |||
| } | |||
| catch ( StoreFailureException e ) | |||
| { | |||
| //This means that we did not perform a full migration, as the formats had the same capabilities. Thus | |||
| // we should use the store directory for information when rebuilding the count store. | |||
| rebuildCountsFromScratch( storeDir, lastTxId, progressMonitor, versionToMigrateFrom, pageCache ); | |||
| } | |||
| } | |||
| } | |||
|
|
|||
| @Override | |||
| public void moveMigratedFiles( File migrationDir, File storeDir, String versionToUpgradeFrom, | |||
| String versionToUpgradeTo ) throws IOException | |||
| { | |||
| // Move the migrated ones into the store directory | |||
| StoreFile.fileOperation( MOVE, fileSystem, migrationDir, storeDir, COUNTS_STORE_FILES, true, | |||
| // allow to skip non existent source files | |||
| ExistingTargetStrategy.OVERWRITE, // allow to overwrite target files | |||
| StoreFileType.values() ); | |||
| // We do not need to move files with the page cache, as the count files always reside on the normal file system. | |||
| } | |||
|
|
|||
| @Override | |||
| public void cleanup( File migrationDir ) throws IOException | |||
| { | |||
| fileSystem.deleteRecursively( migrationDir ); | |||
| } | |||
|
|
|||
| @Override | |||
| public String toString() | |||
| { | |||
| return "Kernel Node Count Rebuilder"; | |||
| } | |||
|
|
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| boolean countStoreRebuildRequired( String versionToMigrateFrom ) | |||
| { | |||
| return StandardV2_3.STORE_VERSION.equals( versionToMigrateFrom ) || | |||
| StandardV3_0.STORE_VERSION.equals( versionToMigrateFrom ) || | |||
| StoreVersion.HIGH_LIMIT_V3_0_0.versionString().equals( versionToMigrateFrom ) || | |||
| StoreVersion.HIGH_LIMIT_V3_0_6.versionString().equals( versionToMigrateFrom ) || | |||
| StoreVersion.HIGH_LIMIT_V3_1_0.versionString().equals( versionToMigrateFrom ); | |||
| } | |||
|
|
|||
| private void rebuildCountsFromScratch( File migrationDir, long lastTxId, | |||
| MigrationProgressMonitor.Section progressMonitor, String expectedStoreVersion, PageCache pageCache ) | |||
| { | |||
| final File storeFileBase = new File( migrationDir, MetaDataStore.DEFAULT_NAME + StoreFactory.COUNTS_STORE ); | |||
|
|
|||
| RecordFormats recordFormats = selectForVersion( expectedStoreVersion ); | |||
| StoreFactory storeFactory = new StoreFactory( migrationDir, pageCache, fileSystem, recordFormats, | |||
| NullLogProvider.getInstance() ); | |||
| try ( NeoStores neoStores = storeFactory | |||
| .openNeoStores( StoreType.NODE, StoreType.RELATIONSHIP, StoreType.LABEL_TOKEN, | |||
| StoreType.RELATIONSHIP_TYPE_TOKEN ) ) | |||
| { | |||
| NodeStore nodeStore = neoStores.getNodeStore(); | |||
| RelationshipStore relationshipStore = neoStores.getRelationshipStore(); | |||
| try ( Lifespan life = new Lifespan() ) | |||
| { | |||
| int highLabelId = (int) neoStores.getLabelTokenStore().getHighId(); | |||
| int highRelationshipTypeId = (int) neoStores.getRelationshipTypeTokenStore().getHighId(); | |||
| CountsComputer initializer = new CountsComputer( lastTxId, nodeStore, relationshipStore, highLabelId, | |||
| highRelationshipTypeId, progressMonitor ); | |||
| life.add( new CountsTracker( logService.getInternalLogProvider(), fileSystem, pageCache, config, | |||
| storeFileBase ).setInitializer( initializer ) ); | |||
| } | |||
| } | |||
| } | |||
| } | |||
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