StatusWith<CursorId> ClusterFind::runQuery(OperationContext* txn, const CanonicalQuery& query, const ReadPreferenceSetting& readPref, std::vector<BSONObj>* results) { invariant(results); // Projection on the reserved sort key field is illegal in mongos. if (query.getParsed().getProj().hasField(ClusterClientCursorParams::kSortKeyField)) { return {ErrorCodes::BadValue, str::stream() << "Projection contains illegal field '" << ClusterClientCursorParams::kSortKeyField << "': " << query.getParsed().getProj()}; } auto dbConfig = grid.catalogCache()->getDatabase(txn, query.nss().db().toString()); if (dbConfig.getStatus() == ErrorCodes::NamespaceNotFound) { // If the database doesn't exist, we successfully return an empty result set without // creating a cursor. return CursorId(0); } else if (!dbConfig.isOK()) { return dbConfig.getStatus(); } std::shared_ptr<ChunkManager> chunkManager; std::shared_ptr<Shard> primary; dbConfig.getValue()->getChunkManagerOrPrimary(txn, query.nss().ns(), chunkManager, primary); // Re-target and re-send the initial find command to the shards until we have established the // shard version. for (size_t retries = 1; retries <= kMaxStaleConfigRetries; ++retries) { auto cursorId = runQueryWithoutRetrying( txn, query, readPref, chunkManager.get(), std::move(primary), results); if (cursorId.isOK()) { return cursorId; } auto status = std::move(cursorId.getStatus()); if (status != ErrorCodes::SendStaleConfig && status != ErrorCodes::RecvStaleConfig && status != ErrorCodes::HostUnreachable) { // Errors other than receiving a stale config message from mongoD or an unreachable host // are fatal to the operation. return status; } LOG(1) << "Received error status for query " << query.toStringShort() << " on attempt " << retries << " of " << kMaxStaleConfigRetries << ": " << status; chunkManager = dbConfig.getValue()->getChunkManagerIfExists(txn, query.nss().ns(), true); if (!chunkManager) { dbConfig.getValue()->getChunkManagerOrPrimary( txn, query.nss().ns(), chunkManager, primary); } } return {ErrorCodes::StaleShardVersion, str::stream() << "Retried " << kMaxStaleConfigRetries << " times without establishing shard version on a reachable host."}; }
StatusWith<CursorId> ClusterFind::runQuery(OperationContext* txn, const CanonicalQuery& query, const ReadPreferenceSetting& readPref, std::vector<BSONObj>* results) { invariant(results); auto dbConfig = grid.catalogCache()->getDatabase(txn, query.nss().db().toString()); if (dbConfig.getStatus() == ErrorCodes::DatabaseNotFound) { // If the database doesn't exist, we successfully return an empty result set without // creating a cursor. return CursorId(0); } else if (!dbConfig.isOK()) { return dbConfig.getStatus(); } std::shared_ptr<ChunkManager> chunkManager; std::shared_ptr<Shard> primary; dbConfig.getValue()->getChunkManagerOrPrimary(query.nss().ns(), chunkManager, primary); // Re-target and re-send the initial find command to the shards until we have established the // shard version. for (size_t retries = 1; retries <= kMaxStaleConfigRetries; ++retries) { auto cursorId = runQueryWithoutRetrying( txn, query, readPref, chunkManager.get(), std::move(primary), results); if (cursorId.isOK()) { return cursorId; } auto status = std::move(cursorId.getStatus()); if (status != ErrorCodes::RecvStaleConfig) { // Errors other than receiving a stale config message from mongoD are fatal to the // operation. return status; } LOG(1) << "Received stale config for query " << query.toStringShort() << " on attempt " << retries << " of " << kMaxStaleConfigRetries << ": " << status.reason(); invariant(chunkManager); chunkManager = chunkManager->reload(txn); } return {ErrorCodes::StaleShardVersion, str::stream() << "Retried " << kMaxStaleConfigRetries << " times without establishing shard version."}; }
StatusWith<CursorId> ClusterFind::runQuery(OperationContext* txn, const CanonicalQuery& query, const ReadPreferenceSetting& readPref, std::vector<BSONObj>* results, BSONObj* viewDefinition) { invariant(results); // Projection on the reserved sort key field is illegal in mongos. if (query.getQueryRequest().getProj().hasField(ClusterClientCursorParams::kSortKeyField)) { return {ErrorCodes::BadValue, str::stream() << "Projection contains illegal field '" << ClusterClientCursorParams::kSortKeyField << "': " << query.getQueryRequest().getProj()}; } auto dbConfig = Grid::get(txn)->catalogCache()->getDatabase(txn, query.nss().db().toString()); if (dbConfig.getStatus() == ErrorCodes::NamespaceNotFound) { // If the database doesn't exist, we successfully return an empty result set without // creating a cursor. return CursorId(0); } else if (!dbConfig.isOK()) { return dbConfig.getStatus(); } std::shared_ptr<ChunkManager> chunkManager; std::shared_ptr<Shard> primary; dbConfig.getValue()->getChunkManagerOrPrimary(txn, query.nss().ns(), chunkManager, primary); // Re-target and re-send the initial find command to the shards until we have established the // shard version. for (size_t retries = 1; retries <= kMaxStaleConfigRetries; ++retries) { auto cursorId = runQueryWithoutRetrying( txn, query, readPref, chunkManager.get(), std::move(primary), results, viewDefinition); if (cursorId.isOK()) { return cursorId; } auto status = std::move(cursorId.getStatus()); if (!ErrorCodes::isStaleShardingError(status.code()) && status != ErrorCodes::ShardNotFound) { // Errors other than trying to reach a non existent shard or receiving a stale // metadata message from MongoD are fatal to the operation. Network errors and // replication retries happen at the level of the AsyncResultsMerger. return status; } LOG(1) << "Received error status for query " << redact(query.toStringShort()) << " on attempt " << retries << " of " << kMaxStaleConfigRetries << ": " << redact(status); const bool staleEpoch = (status == ErrorCodes::StaleEpoch); if (staleEpoch) { if (!dbConfig.getValue()->reload(txn)) { // If the reload failed that means the database wasn't found, so successfully return // an empty result set without creating a cursor. return CursorId(0); } } chunkManager = dbConfig.getValue()->getChunkManagerIfExists(txn, query.nss().ns(), true, staleEpoch); if (!chunkManager) { dbConfig.getValue()->getChunkManagerOrPrimary( txn, query.nss().ns(), chunkManager, primary); } } return {ErrorCodes::StaleShardVersion, str::stream() << "Retried " << kMaxStaleConfigRetries << " times without successfully establishing shard version."}; }