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/**
* 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
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