Examples with LatestCheckPointFinder org.neo4j.kernel.recovery.LatestCheckPointFinder used on opensource projects

Example 6 with LatestCheckPointFinder

use of org.neo4j.kernel.recovery.LatestCheckPointFinder in project neo4j by neo4j.

the class RecoveryRequiredChecker method isRecoveryRequiredAt.

public boolean isRecoveryRequiredAt(File dataDir) throws IOException {
    File neoStore = new File(dataDir, MetaDataStore.DEFAULT_NAME);
    boolean noStoreFound = !NeoStores.isStorePresent(pageCache, dataDir);
    // We need config to determine where the logical log files are
    if (noStoreFound) {
        // No database in the specified directory.
        return false;
    }
    long logVersion = MetaDataStore.getRecord(pageCache, neoStore, MetaDataStore.Position.LOG_VERSION);
    PhysicalLogFiles logFiles = new PhysicalLogFiles(dataDir, fs);
    LogEntryReader<ReadableClosablePositionAwareChannel> reader = new VersionAwareLogEntryReader<>();
    LatestCheckPointFinder finder = new LatestCheckPointFinder(logFiles, fs, reader);
    return new PositionToRecoverFrom(finder, NO_MONITOR).apply(logVersion) != LogPosition.UNSPECIFIED;
}

Example 7 with LatestCheckPointFinder

use of org.neo4j.kernel.recovery.LatestCheckPointFinder in project neo4j by neo4j.

the class RecoveryTest method shouldRecoverExistingData.

@Test
public void shouldRecoverExistingData() throws Exception {
    final PhysicalLogFiles logFiles = new PhysicalLogFiles(directory.directory(), "log", fileSystemRule.get());
    File file = logFiles.getLogFileForVersion(logVersion);
    writeSomeData(file, new Visitor<Pair<LogEntryWriter, Consumer<LogPositionMarker>>, IOException>() {

        @Override
        public boolean visit(Pair<LogEntryWriter, Consumer<LogPositionMarker>> pair) throws IOException {
            LogEntryWriter writer = pair.first();
            Consumer<LogPositionMarker> consumer = pair.other();
            LogPositionMarker marker = new LogPositionMarker();
            // last committed tx
            consumer.accept(marker);
            LogPosition lastCommittedTxPosition = marker.newPosition();
            writer.writeStartEntry(0, 1, 2L, 3L, new byte[0]);
            lastCommittedTxStartEntry = new LogEntryStart(0, 1, 2L, 3L, new byte[0], lastCommittedTxPosition);
            writer.writeCommitEntry(4L, 5L);
            lastCommittedTxCommitEntry = new OnePhaseCommit(4L, 5L);
            // check point pointing to the previously committed transaction
            writer.writeCheckPointEntry(lastCommittedTxPosition);
            expectedCheckPointEntry = new CheckPoint(lastCommittedTxPosition);
            // tx committed after checkpoint
            consumer.accept(marker);
            writer.writeStartEntry(0, 1, 6L, 4L, new byte[0]);
            expectedStartEntry = new LogEntryStart(0, 1, 6L, 4L, new byte[0], marker.newPosition());
            writer.writeCommitEntry(5L, 7L);
            expectedCommitEntry = new OnePhaseCommit(5L, 7L);
            return true;
        }
    });
    LifeSupport life = new LifeSupport();
    Recovery.Monitor monitor = mock(Recovery.Monitor.class);
    final AtomicBoolean recoveryRequired = new AtomicBoolean();
    try {
        StorageEngine storageEngine = mock(StorageEngine.class);
        final LogEntryReader<ReadableClosablePositionAwareChannel> reader = new VersionAwareLogEntryReader<>();
        LatestCheckPointFinder finder = new LatestCheckPointFinder(logFiles, fileSystemRule.get(), reader);
        LogHeaderCache logHeaderCache = new LogHeaderCache(10);
        TransactionMetadataCache metadataCache = new TransactionMetadataCache(100);
        LogFile logFile = life.add(new PhysicalLogFile(fileSystemRule.get(), logFiles, 50, () -> transactionIdStore.getLastCommittedTransactionId(), logVersionRepository, mock(PhysicalLogFile.Monitor.class), logHeaderCache));
        LogicalTransactionStore txStore = new PhysicalLogicalTransactionStore(logFile, metadataCache, reader);
        life.add(new Recovery(new DefaultRecoverySPI(storageEngine, logFiles, fileSystemRule.get(), logVersionRepository, finder, transactionIdStore, txStore, NO_MONITOR) {

            private int nr = 0;

            @Override
            public Visitor<CommittedTransactionRepresentation, Exception> startRecovery() {
                recoveryRequired.set(true);
                final Visitor<CommittedTransactionRepresentation, Exception> actual = super.startRecovery();
                return new Visitor<CommittedTransactionRepresentation, Exception>() {

                    @Override
                    public boolean visit(CommittedTransactionRepresentation tx) throws Exception {
                        actual.visit(tx);
                        switch(nr++) {
                            case 0:
                                assertEquals(lastCommittedTxStartEntry, tx.getStartEntry());
                                assertEquals(lastCommittedTxCommitEntry, tx.getCommitEntry());
                                break;
                            case 1:
                                assertEquals(expectedStartEntry, tx.getStartEntry());
                                assertEquals(expectedCommitEntry, tx.getCommitEntry());
                                break;
                            default:
                                fail("Too many recovered transactions");
                        }
                        return false;
                    }
                };
            }
        }, monitor));
        life.start();
        InOrder order = inOrder(monitor);
        order.verify(monitor, times(1)).recoveryRequired(any(LogPosition.class));
        order.verify(monitor, times(1)).recoveryCompleted(2);
        assertTrue(recoveryRequired.get());
    } finally {
        life.shutdown();
    }
}

Example 8 with LatestCheckPointFinder

use of org.neo4j.kernel.recovery.LatestCheckPointFinder in project neo4j by neo4j.

the class MigrationTestUtils method removeCheckPointFromTxLog.

public static void removeCheckPointFromTxLog(FileSystemAbstraction fileSystem, File workingDirectory) throws IOException {
    PhysicalLogFiles logFiles = new PhysicalLogFiles(workingDirectory, fileSystem);
    LogEntryReader<ReadableClosablePositionAwareChannel> logEntryReader = new VersionAwareLogEntryReader<>();
    LatestCheckPointFinder finder = new LatestCheckPointFinder(logFiles, fileSystem, logEntryReader);
    LatestCheckPointFinder.LatestCheckPoint latestCheckPoint = finder.find(logFiles.getHighestLogVersion());
    if (latestCheckPoint.commitsAfterCheckPoint) {
        // done already
        return;
    }
    // let's assume there is at least a checkpoint
    assertNotNull(latestCheckPoint.checkPoint);
    LogPosition logPosition = latestCheckPoint.checkPoint.getLogPosition();
    File logFile = logFiles.getLogFileForVersion(logPosition.getLogVersion());
    fileSystem.truncate(logFile, logPosition.getByteOffset());
}