Examples with WriteOplogTransaction com.torodb.mongodb.repl.OplogManager.WriteOplogTransaction used on opensource projects

Example 1 with WriteOplogTransaction

use of com.torodb.mongodb.repl.OplogManager.WriteOplogTransaction in project torodb by torodb.

the class RecoveryService method initialSync.

private boolean initialSync() throws TryAgainException, FatalErrorException {
    /*
     * 1. store that data is inconsistent 2. decide a sync source 3. lastRemoteOptime1 = get the
     * last optime of the sync source 4. clone all databases except local 5. lastRemoteOptime2 = get
     * the last optime of the sync source 6. apply remote oplog from lastRemoteOptime1 to
     * lastRemoteOptime2 7. lastRemoteOptime3 = get the last optime of the sync source 8. apply
     * remote oplog from lastRemoteOptime2 to lastRemoteOptime3 9. rebuild indexes 10. store
     * lastRemoteOptime3 as the last applied operation optime 11. store that data is consistent 12.
     * change replication state to SECONDARY
     */
    //TODO: Support fastsync (used to restore a node by copying the data from other up-to-date node)
    LOGGER.info("Starting initial sync");
    callback.setConsistentState(false);
    HostAndPort syncSource;
    try {
        syncSource = syncSourceProvider.newSyncSource();
        LOGGER.info("Using node " + syncSource + " to replicate from");
    } catch (NoSyncSourceFoundException ex) {
        throw new TryAgainException("No sync source");
    }
    MongoClient remoteClient;
    try {
        remoteClient = remoteClientFactory.createClient(syncSource);
    } catch (UnreachableMongoServerException ex) {
        throw new TryAgainException(ex);
    }
    try {
        LOGGER.debug("Remote client obtained");
        MongoConnection remoteConnection = remoteClient.openConnection();
        try (OplogReader reader = oplogReaderProvider.newReader(remoteConnection)) {
            OplogOperation lastClonedOp = reader.getLastOp();
            OpTime lastRemoteOptime1 = lastClonedOp.getOpTime();
            try (WriteOplogTransaction oplogTransaction = oplogManager.createWriteTransaction()) {
                LOGGER.info("Remote database cloning started");
                oplogTransaction.truncate();
                LOGGER.info("Local databases dropping started");
                Status<?> status = dropDatabases();
                if (!status.isOk()) {
                    throw new TryAgainException("Error while trying to drop collections: " + status);
                }
                LOGGER.info("Local databases dropping finished");
                if (!isRunning()) {
                    LOGGER.warn("Recovery stopped before it can finish");
                    return false;
                }
                LOGGER.info("Remote database cloning started");
                cloneDatabases(remoteClient);
                LOGGER.info("Remote database cloning finished");
                oplogTransaction.forceNewValue(lastClonedOp.getHash(), lastClonedOp.getOpTime());
            }
            if (!isRunning()) {
                LOGGER.warn("Recovery stopped before it can finish");
                return false;
            }
            TorodServer torodServer = server.getTorodServer();
            try (TorodConnection connection = torodServer.openConnection();
                SharedWriteTorodTransaction trans = connection.openWriteTransaction(false)) {
                OpTime lastRemoteOptime2 = reader.getLastOp().getOpTime();
                LOGGER.info("First oplog application started");
                applyOplog(reader, lastRemoteOptime1, lastRemoteOptime2);
                trans.commit();
                LOGGER.info("First oplog application finished");
                if (!isRunning()) {
                    LOGGER.warn("Recovery stopped before it can finish");
                    return false;
                }
                OplogOperation lastOperation = reader.getLastOp();
                OpTime lastRemoteOptime3 = lastOperation.getOpTime();
                LOGGER.info("Second oplog application started");
                applyOplog(reader, lastRemoteOptime2, lastRemoteOptime3);
                trans.commit();
                LOGGER.info("Second oplog application finished");
                if (!isRunning()) {
                    LOGGER.warn("Recovery stopped before it can finish");
                    return false;
                }
                LOGGER.info("Index rebuild started");
                rebuildIndexes();
                trans.commit();
                LOGGER.info("Index rebuild finished");
                if (!isRunning()) {
                    LOGGER.warn("Recovery stopped before it can finish");
                    return false;
                }
                trans.commit();
            }
        } catch (OplogStartMissingException ex) {
            throw new TryAgainException(ex);
        } catch (OplogOperationUnsupported ex) {
            throw new TryAgainException(ex);
        } catch (MongoException | RollbackException ex) {
            throw new TryAgainException(ex);
        } catch (OplogManagerPersistException ex) {
            throw new FatalErrorException();
        } catch (UserException ex) {
            throw new FatalErrorException(ex);
        }
        callback.setConsistentState(true);
        LOGGER.info("Initial sync finished");
    } finally {
        remoteClient.close();
    }
    return true;
}

Example 2 with WriteOplogTransaction

use of com.torodb.mongodb.repl.OplogManager.WriteOplogTransaction in project torodb by torodb.

the class ReplSyncApplier method runProtected.

@Override
protected void runProtected() {
    runThread = Thread.currentThread();
    /*
     * TODO: In general, the replication context can be set as not reaplying. But it is not frequent
     * but possible to stop the replication after some oplog ops have been apply but not marked as
     * executed on the oplog manager. For that reason, all oplog ops betwen the last operation that
     * have been marked as applyed and the current last operation on the remote oplog must be
     * executed as replying operations. As it is not possible to do that yet, we have to always
     * apply operations as replying to be safe.
     */
    ApplierContext applierContext = new ApplierContext.Builder().setReapplying(true).setUpdatesAsUpserts(true).build();
    while (isRunning()) {
        OplogOperation lastOperation = null;
        ExclusiveWriteMongodTransaction trans = connection.openExclusiveWriteTransaction();
        try (ExclusiveWriteMongodTransaction transaction = trans) {
            try {
                for (OplogOperation opToApply : callback.takeOps()) {
                    lastOperation = opToApply;
                    LOGGER.trace("Executing {}", opToApply);
                    try {
                        boolean done = false;
                        while (!done) {
                            try {
                                oplogOpApplier.apply(opToApply, transaction, applierContext);
                                transaction.commit();
                                done = true;
                            } catch (RollbackException ex) {
                                LOGGER.debug("Recived a rollback exception while applying an oplog op", ex);
                            }
                        }
                    } catch (OplogApplyingException ex) {
                        if (!callback.failedToApply(opToApply, ex)) {
                            LOGGER.error(serviceName() + " stopped because one operation " + "cannot be executed", ex);
                            break;
                        }
                    } catch (UserException ex) {
                        if (callback.failedToApply(opToApply, ex)) {
                            LOGGER.error(serviceName() + " stopped because one operation " + "cannot be executed", ex);
                            break;
                        }
                    } catch (Throwable ex) {
                        if (callback.failedToApply(opToApply, ex)) {
                            LOGGER.error(serviceName() + " stopped because " + "an unknown error", ex);
                            break;
                        }
                    }
                    callback.markAsApplied(opToApply);
                }
            } catch (InterruptedException ex) {
                LOGGER.debug("Interrupted applier thread while applying an operator");
            }
        }
        if (lastOperation != null) {
            try (WriteOplogTransaction oplogTransaction = oplogManager.createWriteTransaction()) {
                oplogTransaction.addOperation(lastOperation);
            } catch (OplogManagerPersistException ex) {
                if (callback.failedToApply(lastOperation, ex)) {
                    LOGGER.error(serviceName() + " stopped because " + "the last applied operation couldn't " + "be persisted", ex);
                    break;
                }
            }
        }
    }
}