@Override
public void run() {
while (context.getStatus() == Status.RUNNING) {
try {
if (!assignCollections()) {
break; // failed to assign oplogCollection or
// slurpedCollection
}
Timestamp<?> startTimestamp = null;
if (!definition.isSkipInitialImport()) {
if (!riverHasIndexedFromOplog() && definition.getInitialTimestamp() == null) {
if (!isIndexEmpty()) {
MongoDBRiverHelper.setRiverStatus(
client, definition.getRiverName(), Status.INITIAL_IMPORT_FAILED);
break;
}
if (definition.isImportAllCollections()) {
for (String name : slurpedDb.getCollectionNames()) {
DBCollection collection = slurpedDb.getCollection(name);
startTimestamp = doInitialImport(collection);
}
} else {
DBCollection collection = slurpedDb.getCollection(definition.getMongoCollection());
startTimestamp = doInitialImport(collection);
}
}
} else {
logger.info("Skip initial import from collection {}", definition.getMongoCollection());
}
// Slurp from oplog
DBCursor cursor = null;
try {
cursor = oplogCursor(startTimestamp);
if (cursor == null) {
cursor = processFullOplog();
}
while (cursor.hasNext()) {
DBObject item = cursor.next();
startTimestamp = processOplogEntry(item, startTimestamp);
}
logger.debug("Before waiting for 500 ms");
Thread.sleep(500);
} catch (MongoException.CursorNotFound e) {
logger.info(
"Cursor {} has been closed. About to open a new cusor.", cursor.getCursorId());
logger.debug("Total document inserted [{}]", totalDocuments.get());
} catch (SlurperException sEx) {
logger.warn("Exception in slurper", sEx);
break;
} catch (Exception ex) {
logger.warn("Exception while looping in cursor", ex);
Thread.currentThread().interrupt();
break;
} finally {
if (cursor != null) {
logger.trace("Closing oplog cursor");
cursor.close();
}
}
} catch (MongoInterruptedException mIEx) {
logger.warn("Mongo driver has been interrupted", mIEx);
if (mongo != null) {
mongo.close();
mongo = null;
}
Thread.currentThread().interrupt();
break;
} catch (MongoException e) {
logger.error("Mongo gave an exception", e);
try {
Thread.sleep(5000);
} catch (InterruptedException iEx) {
}
} catch (NoSuchElementException e) {
logger.warn("A mongoDB cursor bug ?", e);
} catch (InterruptedException e) {
logger.info("river-mongodb slurper interrupted");
Thread.currentThread().interrupt();
break;
}
}
}
private Timestamp<?> processOplogEntry(final DBObject entry, final Timestamp<?> startTimestamp)
throws InterruptedException {
// To support transactions, TokuMX wraps one or more operations in a single oplog entry, in a
// list.
// As long as clients are not transaction-aware, we can pretty safely assume there will only be
// one operation in the list.
// Supporting genuine multi-operation transactions will require a bit more logic here.
flattenOps(entry);
if (!isValidOplogEntry(entry, startTimestamp)) {
return startTimestamp;
}
Operation operation = Operation.fromString(entry.get(MongoDBRiver.OPLOG_OPERATION).toString());
String namespace = entry.get(MongoDBRiver.OPLOG_NAMESPACE).toString();
String collection = null;
Timestamp<?> oplogTimestamp = Timestamp.on(entry);
DBObject object = (DBObject) entry.get(MongoDBRiver.OPLOG_OBJECT);
if (definition.isImportAllCollections()) {
if (namespace.startsWith(definition.getMongoDb()) && !namespace.equals(cmdOplogNamespace)) {
collection = getCollectionFromNamespace(namespace);
}
} else {
collection = definition.getMongoCollection();
}
if (namespace.equals(cmdOplogNamespace)) {
if (object.containsField(MongoDBRiver.OPLOG_DROP_COMMAND_OPERATION)) {
operation = Operation.DROP_COLLECTION;
if (definition.isImportAllCollections()) {
collection = object.get(MongoDBRiver.OPLOG_DROP_COMMAND_OPERATION).toString();
if (collection.startsWith("tmp.mr.")) {
return startTimestamp;
}
}
}
if (object.containsField(MongoDBRiver.OPLOG_DROP_DATABASE_COMMAND_OPERATION)) {
operation = Operation.DROP_DATABASE;
}
}
logger.trace("namespace: {} - operation: {}", namespace, operation);
if (namespace.equals(MongoDBRiver.OPLOG_ADMIN_COMMAND)) {
if (operation == Operation.COMMAND) {
processAdminCommandOplogEntry(entry, startTimestamp);
return startTimestamp;
}
}
if (logger.isTraceEnabled()) {
logger.trace("MongoDB object deserialized: {}", object.toString());
logger.trace("collection: {}", collection);
logger.trace("oplog entry - namespace [{}], operation [{}]", namespace, operation);
logger.trace("oplog processing item {}", entry);
}
String objectId = getObjectIdFromOplogEntry(entry);
if (operation == Operation.DELETE) {
// Include only _id in data, as vanilla MongoDB does, so transformation scripts won't be
// broken by Toku
if (object.containsField(MongoDBRiver.MONGODB_ID_FIELD)) {
if (object.keySet().size() > 1) {
entry.put(
MongoDBRiver.OPLOG_OBJECT,
object = new BasicDBObject(MongoDBRiver.MONGODB_ID_FIELD, objectId));
}
} else {
throw new NullPointerException(MongoDBRiver.MONGODB_ID_FIELD);
}
}
if (definition.isMongoGridFS()
&& namespace.endsWith(MongoDBRiver.GRIDFS_FILES_SUFFIX)
&& (operation == Operation.INSERT || operation == Operation.UPDATE)) {
if (objectId == null) {
throw new NullPointerException(MongoDBRiver.MONGODB_ID_FIELD);
}
GridFS grid = new GridFS(mongo.getDB(definition.getMongoDb()), collection);
GridFSDBFile file = grid.findOne(new ObjectId(objectId));
if (file != null) {
logger.info("Caught file: {} - {}", file.getId(), file.getFilename());
object = file;
} else {
logger.warn("Cannot find file from id: {}", objectId);
}
}
if (object instanceof GridFSDBFile) {
if (objectId == null) {
throw new NullPointerException(MongoDBRiver.MONGODB_ID_FIELD);
}
if (logger.isTraceEnabled()) {
logger.trace("Add attachment: {}", objectId);
}
addToStream(operation, oplogTimestamp, applyFieldFilter(object), collection);
} else {
if (operation == Operation.UPDATE) {
DBObject update = (DBObject) entry.get(MongoDBRiver.OPLOG_UPDATE);
logger.debug("Updated item: {}", update);
addQueryToStream(operation, oplogTimestamp, update, collection);
} else {
if (operation == Operation.INSERT) {
addInsertToStream(oplogTimestamp, applyFieldFilter(object), collection);
} else {
addToStream(operation, oplogTimestamp, applyFieldFilter(object), collection);
}
}
}
return oplogTimestamp;
}
private String addInsertToStream(final Timestamp<?> currentTimestamp, final DBObject data)
throws InterruptedException {
return addInsertToStream(currentTimestamp, data, definition.getMongoCollection());
}
/**
* Does an initial sync the same way MongoDB does. https://groups.google.com/
* forum/?fromgroups=#!topic/mongodb-user/sOKlhD_E2ns
*
* @return the last oplog timestamp before the import began
* @throws InterruptedException if the blocking queue stream is interrupted while waiting
*/
protected Timestamp<?> doInitialImport(DBCollection collection) throws InterruptedException {
// TODO: ensure the index type is empty
// DBCollection slurpedCollection =
// slurpedDb.getCollection(definition.getMongoCollection());
logger.info("MongoDBRiver is beginning initial import of " + collection.getFullName());
Timestamp<?> startTimestamp = getCurrentOplogTimestamp();
boolean inProgress = true;
String lastId = null;
while (inProgress) {
DBCursor cursor = null;
try {
if (definition.isDisableIndexRefresh()) {
updateIndexRefresh(definition.getIndexName(), -1L);
}
if (!definition.isMongoGridFS()) {
logger.info("Collection {} - count: {}", collection.getName(), collection.count());
long count = 0;
cursor =
collection.find(
getFilterForInitialImport(definition.getMongoCollectionFilter(), lastId));
while (cursor.hasNext()) {
DBObject object = cursor.next();
count++;
if (cursor.hasNext()) {
lastId = addInsertToStream(null, applyFieldFilter(object), collection.getName());
} else {
logger.debug("Last entry for initial import - add timestamp: {}", startTimestamp);
lastId =
addInsertToStream(startTimestamp, applyFieldFilter(object), collection.getName());
}
}
inProgress = false;
logger.info("Number documents indexed: {}", count);
} else {
// TODO: To be optimized.
// https://github.com/mongodb/mongo-java-driver/pull/48#issuecomment-25241988
// possible option: Get the object id list from .fs
// collection
// then call GriDFS.findOne
GridFS grid =
new GridFS(mongo.getDB(definition.getMongoDb()), definition.getMongoCollection());
cursor = grid.getFileList();
while (cursor.hasNext()) {
DBObject object = cursor.next();
if (object instanceof GridFSDBFile) {
GridFSDBFile file =
grid.findOne(new ObjectId(object.get(MongoDBRiver.MONGODB_ID_FIELD).toString()));
if (cursor.hasNext()) {
lastId = addInsertToStream(null, file);
} else {
logger.debug("Last entry for initial import - add timestamp: {}", startTimestamp);
lastId = addInsertToStream(startTimestamp, file);
}
}
}
inProgress = false;
}
} catch (MongoException.CursorNotFound e) {
logger.info(
"Initial import - Cursor {} has been closed. About to open a new cusor.",
cursor.getCursorId());
logger.debug("Total document inserted [{}]", totalDocuments.get());
} finally {
if (cursor != null) {
logger.trace("Closing initial import cursor");
cursor.close();
}
if (definition.isDisableIndexRefresh()) {
updateIndexRefresh(definition.getIndexName(), TimeValue.timeValueSeconds(1));
}
}
}
return startTimestamp;
}
