diff options
Diffstat (limited to 'src/mongo/db/repl/tenant_migration_recipient_service.cpp')
| -rw-r--r-- | src/mongo/db/repl/tenant_migration_recipient_service.cpp | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/src/mongo/db/repl/tenant_migration_recipient_service.cpp b/src/mongo/db/repl/tenant_migration_recipient_service.cpp new file mode 100644 index 00000000000..02b0f7be1ab --- /dev/null +++ b/src/mongo/db/repl/tenant_migration_recipient_service.cpp @@ -0,0 +1,156 @@ +/** + * Copyright (C) 2020-present MongoDB, Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the Server Side Public License, version 1, + * as published by MongoDB, Inc. + * + * 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 + * Server Side Public License for more details. + * + * You should have received a copy of the Server Side Public License + * along with this program. If not, see + * <http://www.mongodb.com/licensing/server-side-public-license>. + * + * As a special exception, the copyright holders give permission to link the + * code of portions of this program with the OpenSSL library under certain + * conditions as described in each individual source file and distribute + * linked combinations including the program with the OpenSSL library. You + * must comply with the Server Side Public License in all respects for + * all of the code used other than as permitted herein. If you modify file(s) + * with this exception, you may extend this exception to your version of the + * file(s), but you are not obligated to do so. If you do not wish to do so, + * delete this exception statement from your version. If you delete this + * exception statement from all source files in the program, then also delete + * it in the license file. + */ + +#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kReplication + +#include "mongo/platform/basic.h" + +#include "mongo/db/client.h" +#include "mongo/db/dbdirectclient.h" +#include "mongo/db/namespace_string.h" +#include "mongo/db/repl/repl_client_info.h" +#include "mongo/db/repl/tenant_migration_recipient_entry_helpers.h" +#include "mongo/db/repl/tenant_migration_recipient_service.h" +#include "mongo/db/repl/tenant_migration_state_machine_gen.h" +#include "mongo/db/repl/wait_for_majority_service.h" +#include "mongo/db/write_concern_options.h" +#include "mongo/logv2/log.h" +#include "mongo/rpc/get_status_from_command_result.h" + +namespace mongo { +namespace repl { + +// Fails before waiting for the state doc to be majority replicated. +MONGO_FAIL_POINT_DEFINE(failWhilePersistingTenantMigrationRecipientInstanceStateDoc); + +TenantMigrationRecipientService::TenantMigrationRecipientService(ServiceContext* serviceContext) + : PrimaryOnlyService(serviceContext) {} + +StringData TenantMigrationRecipientService::getServiceName() const { + return kTenantMigrationRecipientServiceName; +} + +NamespaceString TenantMigrationRecipientService::getStateDocumentsNS() const { + return NamespaceString::kTenantMigrationRecipientsNamespace; +} + +ThreadPool::Limits TenantMigrationRecipientService::getThreadPoolLimits() const { + // TODO SERVER-50669: This will be replaced by a tunable server parameter. + return ThreadPool::Limits(); +} + +std::shared_ptr<PrimaryOnlyService::Instance> TenantMigrationRecipientService::constructInstance( + BSONObj initialStateDoc) const { + return std::make_shared<TenantMigrationRecipientService::Instance>(initialStateDoc); +} + +TenantMigrationRecipientService::Instance::Instance(BSONObj stateDoc) + : PrimaryOnlyService::TypedInstance<Instance>() { + _stateDoc = TenantMigrationRecipientDocument::parse(IDLParserErrorContext("recipientStateDoc"), + stateDoc); +} + +SemiFuture<void> TenantMigrationRecipientService::Instance::run( + std::shared_ptr<executor::ScopedTaskExecutor> executor) noexcept { + return ExecutorFuture(**executor) + .then([this]() -> SharedSemiFuture<void> { + auto uniqueOpCtx = cc().makeOperationContext(); + auto opCtx = uniqueOpCtx.get(); + + // The instance is marked as garbage collect if the migration is either + // committed or aborted on donor side. So, don't start the recipient task if the + // instance state doc is marked for garbage collect. + uassert(ErrorCodes::IllegalOperation, + str::stream() << "Can't start the data sync as the state doc is already marked " + "for garbage collect for migration uuid: " + << getMigrationUUID(), + !isMarkedForGarbageCollect()); + + auto lastOpBeforeRun = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp(); + + // Persist the state doc before starting the data sync. + auto status = tenantMigrationRecipientEntryHelpers::insertStateDoc(opCtx, _stateDoc); + + // TODO SERVER-50742: Ignoring duplicate check step should be removed. + // We can hit duplicate key error when the instances are rebuilt on a new primary after + // step up. So, it's ok to ignore duplicate key errors. + if (status != ErrorCodes::DuplicateKey) { + uassertStatusOK(status); + } + + auto lastOpAfterRun = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp(); + // No writes happened implies that the state doc is already on disk. This can happen + // only when the instances are rebuilt on node step up. And, + // PrimaryOnlyService::onStepUp() waits for majority commit of the primary no-op oplog + // entry written by the node in the newer term before scheduling the Instance::run(). + // So, it's safe to assume that instance's state document written in an older term on + // disk won't get rolled back for step up case. + if (lastOpBeforeRun == lastOpAfterRun) { + // TODO SERVER-50742: Add an invariant check to make sure this case can happen only + // for step up. + return {Future<void>::makeReady()}; + } + + if (MONGO_unlikely( + failWhilePersistingTenantMigrationRecipientInstanceStateDoc.shouldFail())) { + LOGV2(4878500, "Persisting state doc failed due to fail point enabled."); + uassert(ErrorCodes::NotWritablePrimary, "not writable primary ", false); + } + + // Wait for the state doc to be majority replicated. + return WaitForMajorityService::get(opCtx->getServiceContext()) + .waitUntilMajority(lastOpAfterRun); + }) + .then([this] { + // TODO SERVER-48808: Run cloners in MigrationServiceInstance + // TODO SERVER-48811: Oplog fetching in MigrationServiceInstance + }) + .onCompletion([this](Status status) { + LOGV2(4878501, + "Tenant Recipient data sync completed.", + "migrationId"_attr = getMigrationUUID(), + "dbPrefix"_attr = _stateDoc.getDatabasePrefix(), + "status"_attr = status); + return status; + }) + .semi(); +} + +const UUID& TenantMigrationRecipientService::Instance::getMigrationUUID() const { + stdx::lock_guard lk(_mutex); + return _stateDoc.getId(); +} + +bool TenantMigrationRecipientService::Instance::isMarkedForGarbageCollect() const { + stdx::lock_guard lk(_mutex); + return _stateDoc.getGarbageCollect(); +} + +} // namespace repl +} // namespace mongo |