/
tenant_migration_recipient_service.cpp
2244 lines (1983 loc) · 106 KB
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tenant_migration_recipient_service.cpp
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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/base/checked_cast.h"
#include "mongo/client/dbclient_connection.h"
#include "mongo/client/replica_set_monitor.h"
#include "mongo/client/replica_set_monitor_manager.h"
#include "mongo/config.h"
#include "mongo/db/client.h"
#include "mongo/db/commands/test_commands_enabled.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/op_observer.h"
#include "mongo/db/pipeline/process_interface/mongo_process_interface.h"
#include "mongo/db/repl/cloner_utils.h"
#include "mongo/db/repl/data_replicator_external_state.h"
#include "mongo/db/repl/oplog_applier.h"
#include "mongo/db/repl/oplog_buffer_collection.h"
#include "mongo/db/repl/oplog_entry.h"
#include "mongo/db/repl/oplog_interface_local.h"
#include "mongo/db/repl/read_concern_args.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/repl/repl_server_parameters_gen.h"
#include "mongo/db/repl/replication_auth.h"
#include "mongo/db/repl/tenant_migration_access_blocker_util.h"
#include "mongo/db/repl/tenant_migration_decoration.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/tenant_migration_statistics.h"
#include "mongo/db/repl/wait_for_majority_service.h"
#include "mongo/db/session_catalog_mongod.h"
#include "mongo/db/session_txn_record_gen.h"
#include "mongo/db/transaction_participant.h"
#include "mongo/db/vector_clock_mutable.h"
#include "mongo/db/write_concern_options.h"
#include "mongo/logv2/log.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/future_util.h"
namespace mongo {
namespace repl {
namespace {
const std::string kTTLIndexName = "TenantMigrationRecipientTTLIndex";
const Backoff kExponentialBackoff(Seconds(1), Milliseconds::max());
constexpr StringData kOplogBufferPrefix = "repl.migration.oplog_"_sd;
NamespaceString getOplogBufferNs(const UUID& migrationUUID) {
return NamespaceString(NamespaceString::kConfigDb,
kOplogBufferPrefix + migrationUUID.toString());
}
boost::intrusive_ptr<ExpressionContext> makeExpressionContext(OperationContext* opCtx) {
StringMap<ExpressionContext::ResolvedNamespace> resolvedNamespaces;
// Add kTenantMigrationOplogView, kSessionTransactionsTableNamespace, and kRsOplogNamespace
// to resolvedNamespaces since they are all used during different pipeline stages.
resolvedNamespaces[NamespaceString::kTenantMigrationOplogView.coll()] = {
NamespaceString::kTenantMigrationOplogView, std::vector<BSONObj>()};
resolvedNamespaces[NamespaceString::kSessionTransactionsTableNamespace.coll()] = {
NamespaceString::kSessionTransactionsTableNamespace, std::vector<BSONObj>()};
resolvedNamespaces[NamespaceString::kRsOplogNamespace.coll()] = {
NamespaceString::kRsOplogNamespace, std::vector<BSONObj>()};
return make_intrusive<ExpressionContext>(opCtx,
boost::none, /* explain */
false, /* fromMongos */
false, /* needsMerge */
true, /* allowDiskUse */
true, /* bypassDocumentValidation */
false, /* isMapReduceCommand */
NamespaceString::kSessionTransactionsTableNamespace,
boost::none, /* runtimeConstants */
nullptr, /* collator */
MongoProcessInterface::create(opCtx),
std::move(resolvedNamespaces),
boost::none); /* collUUID */
}
} // namespace
// A convenient place to set test-specific parameters.
MONGO_FAIL_POINT_DEFINE(pauseBeforeRunTenantMigrationRecipientInstance);
MONGO_FAIL_POINT_DEFINE(pauseAfterRunTenantMigrationRecipientInstance);
MONGO_FAIL_POINT_DEFINE(skipTenantMigrationRecipientAuth);
MONGO_FAIL_POINT_DEFINE(skipComparingRecipientAndDonorFCV);
MONGO_FAIL_POINT_DEFINE(autoRecipientForgetMigration);
MONGO_FAIL_POINT_DEFINE(pauseAfterCreatingOplogBuffer);
MONGO_FAIL_POINT_DEFINE(skipFetchingCommittedTransactions);
MONGO_FAIL_POINT_DEFINE(skipFetchingRetryableWritesEntriesBeforeStartOpTime);
// Fails before waiting for the state doc to be majority replicated.
MONGO_FAIL_POINT_DEFINE(failWhilePersistingTenantMigrationRecipientInstanceStateDoc);
MONGO_FAIL_POINT_DEFINE(fpAfterPersistingTenantMigrationRecipientInstanceStateDoc);
MONGO_FAIL_POINT_DEFINE(fpAfterConnectingTenantMigrationRecipientInstance);
MONGO_FAIL_POINT_DEFINE(fpAfterRecordingRecipientPrimaryStartingFCV);
MONGO_FAIL_POINT_DEFINE(fpAfterComparingRecipientAndDonorFCV);
MONGO_FAIL_POINT_DEFINE(fpAfterRetrievingStartOpTimesMigrationRecipientInstance);
MONGO_FAIL_POINT_DEFINE(fpSetSmallAggregationBatchSize);
MONGO_FAIL_POINT_DEFINE(pauseAfterRetrievingRetryableWritesBatch);
MONGO_FAIL_POINT_DEFINE(fpAfterFetchingRetryableWritesEntriesBeforeStartOpTime);
MONGO_FAIL_POINT_DEFINE(fpAfterStartingOplogFetcherMigrationRecipientInstance);
MONGO_FAIL_POINT_DEFINE(setTenantMigrationRecipientInstanceHostTimeout);
MONGO_FAIL_POINT_DEFINE(pauseAfterRetrievingLastTxnMigrationRecipientInstance);
MONGO_FAIL_POINT_DEFINE(fpBeforeMarkingCollectionClonerDone);
MONGO_FAIL_POINT_DEFINE(fpAfterCollectionClonerDone);
MONGO_FAIL_POINT_DEFINE(fpAfterStartingOplogApplierMigrationRecipientInstance);
MONGO_FAIL_POINT_DEFINE(fpBeforeFulfillingDataConsistentPromise);
MONGO_FAIL_POINT_DEFINE(fpAfterDataConsistentMigrationRecipientInstance);
MONGO_FAIL_POINT_DEFINE(fpBeforePersistingRejectReadsBeforeTimestamp);
MONGO_FAIL_POINT_DEFINE(fpAfterWaitForRejectReadsBeforeTimestamp);
MONGO_FAIL_POINT_DEFINE(hangBeforeTaskCompletion);
MONGO_FAIL_POINT_DEFINE(fpAfterReceivingRecipientForgetMigration);
MONGO_FAIL_POINT_DEFINE(hangAfterCreatingRSM);
MONGO_FAIL_POINT_DEFINE(skipRetriesWhenConnectingToDonorHost);
MONGO_FAIL_POINT_DEFINE(fpBeforeDroppingOplogBufferCollection);
MONGO_FAIL_POINT_DEFINE(fpWaitUntilTimestampMajorityCommitted);
MONGO_FAIL_POINT_DEFINE(fpAfterFetchingCommittedTransactions);
MONGO_FAIL_POINT_DEFINE(hangAfterUpdatingTransactionEntry);
namespace {
// We never restart just the oplog fetcher. If a failure occurs, we restart the whole state machine
// and recover from there. So the restart decision is always "no".
class OplogFetcherRestartDecisionTenantMigration
: public OplogFetcher::OplogFetcherRestartDecision {
public:
~OplogFetcherRestartDecisionTenantMigration(){};
bool shouldContinue(OplogFetcher* fetcher, Status status) final {
return false;
}
void fetchSuccessful(OplogFetcher* fetcher) final {}
};
// The oplog fetcher requires some of the methods in DataReplicatorExternalState to operate.
class DataReplicatorExternalStateTenantMigration : public DataReplicatorExternalState {
public:
// The oplog fetcher is passed its executor directly and does not use the one from the
// DataReplicatorExternalState.
executor::TaskExecutor* getTaskExecutor() const final {
MONGO_UNREACHABLE;
}
std::shared_ptr<executor::TaskExecutor> getSharedTaskExecutor() const final {
MONGO_UNREACHABLE;
}
// The oplog fetcher uses the current term and opTime to inform the sync source of term changes.
// As the term on the donor and the term on the recipient have nothing to do with each other,
// we do not want to do that.
OpTimeWithTerm getCurrentTermAndLastCommittedOpTime() final {
return {OpTime::kUninitializedTerm, OpTime()};
}
// Tenant migration does not require the metadata from the oplog query.
void processMetadata(const rpc::ReplSetMetadata& replMetadata,
rpc::OplogQueryMetadata oqMetadata) final {}
// Tenant migration does not change sync source depending on metadata.
ChangeSyncSourceAction shouldStopFetching(const HostAndPort& source,
const rpc::ReplSetMetadata& replMetadata,
const rpc::OplogQueryMetadata& oqMetadata,
const OpTime& previousOpTimeFetched,
const OpTime& lastOpTimeFetched) final {
return ChangeSyncSourceAction::kContinueSyncing;
}
// The oplog fetcher should never call the rest of the methods.
std::unique_ptr<OplogBuffer> makeInitialSyncOplogBuffer(OperationContext* opCtx) const final {
MONGO_UNREACHABLE;
}
std::unique_ptr<OplogApplier> makeOplogApplier(
OplogBuffer* oplogBuffer,
OplogApplier::Observer* observer,
ReplicationConsistencyMarkers* consistencyMarkers,
StorageInterface* storageInterface,
const OplogApplier::Options& options,
ThreadPool* writerPool) final {
MONGO_UNREACHABLE;
};
virtual StatusWith<ReplSetConfig> getCurrentConfig() const final {
MONGO_UNREACHABLE;
}
};
} // namespace
TenantMigrationRecipientService::TenantMigrationRecipientService(
ServiceContext* const serviceContext)
: PrimaryOnlyService(serviceContext), _serviceContext(serviceContext) {}
StringData TenantMigrationRecipientService::getServiceName() const {
return kTenantMigrationRecipientServiceName;
}
NamespaceString TenantMigrationRecipientService::getStateDocumentsNS() const {
return NamespaceString::kTenantMigrationRecipientsNamespace;
}
ThreadPool::Limits TenantMigrationRecipientService::getThreadPoolLimits() const {
ThreadPool::Limits limits;
limits.maxThreads = maxTenantMigrationRecipientThreadPoolSize;
return limits;
}
ExecutorFuture<void> TenantMigrationRecipientService::_rebuildService(
std::shared_ptr<executor::ScopedTaskExecutor> executor, const CancelationToken& token) {
return AsyncTry([this] {
auto nss = getStateDocumentsNS();
AllowOpCtxWhenServiceRebuildingBlock allowOpCtxBlock(Client::getCurrent());
auto opCtxHolder = cc().makeOperationContext();
auto opCtx = opCtxHolder.get();
DBDirectClient client(opCtx);
BSONObj result;
client.runCommand(
nss.db().toString(),
BSON("createIndexes"
<< nss.coll().toString() << "indexes"
<< BSON_ARRAY(BSON("key" << BSON("expireAt" << 1) << "name" << kTTLIndexName
<< "expireAfterSeconds" << 0))),
result);
uassertStatusOK(getStatusFromCommandResult(result));
})
.until([token](Status status) { return status.isOK() || token.isCanceled(); })
.withBackoffBetweenIterations(kExponentialBackoff)
.on(**executor, CancelationToken::uncancelable());
}
std::shared_ptr<PrimaryOnlyService::Instance> TenantMigrationRecipientService::constructInstance(
BSONObj initialStateDoc) const {
return std::make_shared<TenantMigrationRecipientService::Instance>(
_serviceContext, this, initialStateDoc);
}
TenantMigrationRecipientService::Instance::Instance(
ServiceContext* const serviceContext,
const TenantMigrationRecipientService* recipientService,
BSONObj stateDoc)
: PrimaryOnlyService::TypedInstance<Instance>(),
_serviceContext(serviceContext),
_recipientService(recipientService),
_stateDoc(TenantMigrationRecipientDocument::parse(IDLParserErrorContext("recipientStateDoc"),
stateDoc)),
_tenantId(_stateDoc.getTenantId().toString()),
_migrationUuid(_stateDoc.getId()),
_donorConnectionString(_stateDoc.getDonorConnectionString().toString()),
_donorUri(uassertStatusOK(MongoURI::parse(_stateDoc.getDonorConnectionString().toString()))),
_readPreference(_stateDoc.getReadPreference()),
_transientSSLParams([&]() -> boost::optional<TransientSSLParams> {
if (auto recipientCertificate = _stateDoc.getRecipientCertificateForDonor()) {
invariant(!repl::tenantMigrationDisableX509Auth);
#ifdef MONGO_CONFIG_SSL
uassert(ErrorCodes::IllegalOperation,
"Cannot run tenant migration with x509 authentication as SSL is not enabled",
getSSLGlobalParams().sslMode.load() != SSLParams::SSLMode_disabled);
auto recipientSSLClusterPEMPayload =
recipientCertificate->getCertificate().toString() + "\n" +
recipientCertificate->getPrivateKey().toString();
return TransientSSLParams{_donorUri.connectionString(),
std::move(recipientSSLClusterPEMPayload)};
#else
// If SSL is not supported, the recipientSyncData command should have failed
// certificate field validation.
MONGO_UNREACHABLE;
#endif
} else {
invariant(repl::tenantMigrationDisableX509Auth);
return boost::none;
}
}()) {
}
boost::optional<BSONObj> TenantMigrationRecipientService::Instance::reportForCurrentOp(
MongoProcessInterface::CurrentOpConnectionsMode connMode,
MongoProcessInterface::CurrentOpSessionsMode sessionMode) noexcept {
BSONObjBuilder bob;
stdx::lock_guard lk(_mutex);
bob.append("desc", "tenant recipient migration");
bob.append("instanceID", _stateDoc.getId().toBSON());
bob.append("tenantId", _stateDoc.getTenantId());
bob.append("donorConnectionString", _stateDoc.getDonorConnectionString());
bob.append("readPreference", _stateDoc.getReadPreference().toInnerBSON());
bob.append("state", _stateDoc.getState());
bob.append("dataSyncCompleted", _dataSyncCompletionPromise.getFuture().isReady());
bob.append("migrationCompleted", _taskCompletionPromise.getFuture().isReady());
bob.append("numRestartsDueToDonorConnectionFailure",
_stateDoc.getNumRestartsDueToDonorConnectionFailure());
bob.append("numRestartsDueToRecipientFailure", _stateDoc.getNumRestartsDueToRecipientFailure());
if (_stateDoc.getStartFetchingDonorOpTime())
bob.append("startFetchingDonorOpTime", _stateDoc.getStartFetchingDonorOpTime()->toBSON());
if (_stateDoc.getStartApplyingDonorOpTime())
bob.append("startApplyingDonorOpTime", _stateDoc.getStartApplyingDonorOpTime()->toBSON());
if (_stateDoc.getDataConsistentStopDonorOpTime())
bob.append("dataConsistentStopDonorOpTime",
_stateDoc.getDataConsistentStopDonorOpTime()->toBSON());
if (_stateDoc.getCloneFinishedRecipientOpTime())
bob.append("cloneFinishedRecipientOpTime",
_stateDoc.getCloneFinishedRecipientOpTime()->toBSON());
if (_stateDoc.getExpireAt())
bob.append("expireAt", _stateDoc.getExpireAt()->toString());
if (_client) {
bob.append("donorSyncSource", _client->getServerAddress());
}
return bob.obj();
}
Status TenantMigrationRecipientService::Instance::checkIfOptionsConflict(
const TenantMigrationRecipientDocument& requestedStateDoc) const {
invariant(requestedStateDoc.getId() == _migrationUuid);
if (requestedStateDoc.getTenantId() == _tenantId &&
requestedStateDoc.getDonorConnectionString() == _donorConnectionString &&
requestedStateDoc.getReadPreference().equals(_readPreference)) {
return Status::OK();
}
return Status(ErrorCodes::ConflictingOperationInProgress,
str::stream() << "Requested options for tenant migration doesn't match"
<< " the active migration options, migrationId: " << _migrationUuid
<< ", tenantId: " << _tenantId
<< ", connectionString: " << _donorConnectionString
<< ", readPreference: " << _readPreference.toString()
<< ", requested options:" << requestedStateDoc.toBSON());
}
OpTime TenantMigrationRecipientService::Instance::waitUntilMigrationReachesConsistentState(
OperationContext* opCtx) const {
return _dataConsistentPromise.getFuture().get(opCtx);
}
OpTime
TenantMigrationRecipientService::Instance::waitUntilMigrationReachesReturnAfterReachingTimestamp(
OperationContext* opCtx, const Timestamp& returnAfterReachingTimestamp) {
// This gives assurance that _tenantOplogApplier pointer won't be empty, and that it has been
// started. Additionally, we must have finished processing the recipientSyncData command that
// waits on _dataConsistentPromise.
_dataConsistentPromise.getFuture().get(opCtx);
{
stdx::lock_guard lk(_mutex);
if (_stateDoc.getRejectReadsBeforeTimestamp()) {
uassert(
ErrorCodes::IllegalOperation,
str::stream() << "Received a conflicting returnAfterReachingTimestamp, received: "
<< returnAfterReachingTimestamp.toBSON() << " expected: "
<< _stateDoc.getRejectReadsBeforeTimestamp()->toBSON(),
returnAfterReachingTimestamp == *_stateDoc.getRejectReadsBeforeTimestamp());
}
}
auto getWaitOpTimeFuture = [&]() {
stdx::lock_guard lk(_mutex);
if (_dataSyncCompletionPromise.getFuture().isReady()) {
// When the data sync is done, we reset _tenantOplogApplier, so just throw the data sync
// completion future result.
_dataSyncCompletionPromise.getFuture().get();
MONGO_UNREACHABLE;
}
// Sanity checks.
invariant(_tenantOplogApplier);
auto state = _stateDoc.getState();
uassert(ErrorCodes::IllegalOperation,
str::stream()
<< "Failed to wait for the donor timestamp to be majority committed due to"
"conflicting tenant migration state, migration uuid: "
<< getMigrationUUID() << " , current state: "
<< TenantMigrationRecipientState_serializer(state) << " , expected state: "
<< TenantMigrationRecipientState_serializer(
TenantMigrationRecipientStateEnum::kConsistent)
<< ".",
state == TenantMigrationRecipientStateEnum::kConsistent);
return _tenantOplogApplier->getNotificationForOpTime(
OpTime(returnAfterReachingTimestamp, OpTime::kUninitializedTerm));
};
auto waitOpTimeFuture = getWaitOpTimeFuture();
fpWaitUntilTimestampMajorityCommitted.pauseWhileSet();
auto swDonorRecipientOpTimePair = waitOpTimeFuture.getNoThrow();
auto status = swDonorRecipientOpTimePair.getStatus();
// A cancelation error may occur due to an interrupt. If that is the case, replace the error
// code with the interrupt code, the true reason for interruption.
if (ErrorCodes::isCancelationError(status)) {
stdx::lock_guard lk(_mutex);
if (!_taskState.getInterruptStatus().isOK()) {
status = _taskState.getInterruptStatus();
}
}
uassertStatusOK(status);
// Make sure that the recipient logical clock has advanced to at least the donor timestamp
// before returning success for recipientSyncData.
// Note: tickClusterTimeTo() will not tick the recipient clock backwards in time.
VectorClockMutable::get(opCtx)->tickClusterTimeTo(LogicalTime(returnAfterReachingTimestamp));
{
stdx::lock_guard lk(_mutex);
_stateDoc.setRejectReadsBeforeTimestamp(returnAfterReachingTimestamp);
}
_stopOrHangOnFailPoint(&fpBeforePersistingRejectReadsBeforeTimestamp, opCtx);
uassertStatusOK(tenantMigrationRecipientEntryHelpers::updateStateDoc(opCtx, _stateDoc));
auto writeOpTime = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
auto replCoord = repl::ReplicationCoordinator::get(_serviceContext);
WriteConcernOptions writeConcern(repl::ReplSetConfig::kConfigAllWriteConcernName,
WriteConcernOptions::SyncMode::NONE,
opCtx->getWriteConcern().wTimeout);
uassertStatusOK(replCoord->awaitReplication(opCtx, writeOpTime, writeConcern).status);
_stopOrHangOnFailPoint(&fpAfterWaitForRejectReadsBeforeTimestamp, opCtx);
return swDonorRecipientOpTimePair.getValue().donorOpTime;
}
std::unique_ptr<DBClientConnection> TenantMigrationRecipientService::Instance::_connectAndAuth(
const HostAndPort& serverAddress, StringData applicationName) {
auto swClientBase = ConnectionString(serverAddress)
.connect(applicationName,
0 /* socketTimeout */,
nullptr /* uri */,
nullptr /* apiParameters */,
_transientSSLParams ? &_transientSSLParams.get() : nullptr);
if (!swClientBase.isOK()) {
LOGV2_ERROR(4880400,
"Failed to connect to migration donor",
"tenantId"_attr = getTenantId(),
"migrationId"_attr = getMigrationUUID(),
"serverAddress"_attr = serverAddress,
"applicationName"_attr = applicationName,
"error"_attr = swClientBase.getStatus());
uassertStatusOK(swClientBase.getStatus());
}
auto clientBase = swClientBase.getValue().release();
// ConnectionString::connect() always returns a DBClientConnection in a unique_ptr of
// DBClientBase type.
std::unique_ptr<DBClientConnection> client(checked_cast<DBClientConnection*>(clientBase));
// Authenticate connection to the donor.
if (!_transientSSLParams) {
uassertStatusOK(
replAuthenticate(clientBase)
.withContext(str::stream()
<< "TenantMigrationRecipientService failed to authenticate to "
<< serverAddress));
} else if (MONGO_likely(!skipTenantMigrationRecipientAuth.shouldFail())) {
client->auth(auth::createInternalX509AuthDocument());
}
return client;
}
OpTime TenantMigrationRecipientService::Instance::_getDonorMajorityOpTime(
std::unique_ptr<mongo::DBClientConnection>& client) {
auto oplogOpTimeFields =
BSON(OplogEntry::kTimestampFieldName << 1 << OplogEntry::kTermFieldName << 1);
auto majorityOpTimeBson =
client->findOne(NamespaceString::kRsOplogNamespace.ns(),
Query().sort("$natural", -1),
&oplogOpTimeFields,
QueryOption_SecondaryOk,
ReadConcernArgs(ReadConcernLevel::kMajorityReadConcern).toBSONInner());
uassert(5272003, "Found no entries in the remote oplog", !majorityOpTimeBson.isEmpty());
auto majorityOpTime = uassertStatusOK(OpTime::parseFromOplogEntry(majorityOpTimeBson));
return majorityOpTime;
}
SemiFuture<TenantMigrationRecipientService::Instance::ConnectionPair>
TenantMigrationRecipientService::Instance::_createAndConnectClients() {
LOGV2_DEBUG(4880401,
1,
"Recipient migration service connecting clients",
"tenantId"_attr = getTenantId(),
"migrationId"_attr = getMigrationUUID(),
"connectionString"_attr = _donorConnectionString,
"readPreference"_attr = _readPreference);
const auto& servers = _donorUri.getServers();
stdx::lock_guard lk(_mutex);
_donorReplicaSetMonitor = ReplicaSetMonitor::createIfNeeded(
_donorUri.getSetName(), std::set<HostAndPort>(servers.begin(), servers.end()));
// Only ever used to cancel when the setTenantMigrationRecipientInstanceHostTimeout failpoint is
// set.
CancelationSource getHostCancelSource;
setTenantMigrationRecipientInstanceHostTimeout.execute([&](const BSONObj& data) {
auto exec = **_scopedExecutor;
const auto deadline =
exec->now() + Milliseconds(data["findHostTimeoutMillis"].safeNumberLong());
// Cancel the find host request after a timeout. Ignore callback handle.
exec->sleepUntil(deadline, CancelationToken::uncancelable())
.getAsync([getHostCancelSource](auto) mutable { getHostCancelSource.cancel(); });
});
if (MONGO_unlikely(hangAfterCreatingRSM.shouldFail())) {
LOGV2(5272004, "hangAfterCreatingRSM failpoint enabled");
hangAfterCreatingRSM.pauseWhileSet();
}
const auto kDelayedMajorityOpTimeErrorCode = 5272000;
return AsyncTry([this,
self = shared_from_this(),
getHostCancelSource,
kDelayedMajorityOpTimeErrorCode] {
stdx::lock_guard lk(_mutex);
// Get all donor hosts that we have excluded.
const auto& excludedHosts = _getExcludedDonorHosts(lk);
return _donorReplicaSetMonitor
->getHostOrRefresh(_readPreference, excludedHosts, getHostCancelSource.token())
.thenRunOn(**_scopedExecutor)
.then([this, self = shared_from_this(), kDelayedMajorityOpTimeErrorCode](
const HostAndPort& serverAddress) {
LOGV2(5272002,
"Attempting to connect to donor host",
"donorHost"_attr = serverAddress,
"tenantId"_attr = getTenantId(),
"migrationId"_attr = getMigrationUUID());
// Application name is constructed such that it doesn't exceeds
// kMaxApplicationNameByteLength (128 bytes).
// "TenantMigration_" (16 bytes) + <tenantId> (61 bytes) + "_" (1 byte) +
// <migrationUuid> (36 bytes) = 114 bytes length.
// Note: Since the total length of tenant database name (<tenantId>_<user
// provided db name>) can't exceed 63 bytes and the user provided db name
// should be at least one character long, the maximum length of tenantId can
// only be 61 bytes.
auto applicationName =
"TenantMigration_" + getTenantId() + "_" + getMigrationUUID().toString();
auto client = _connectAndAuth(serverAddress, applicationName);
boost::optional<repl::OpTime> startApplyingOpTime;
Timestamp startMigrationDonorTimestamp;
{
stdx::lock_guard lk(_mutex);
startApplyingOpTime = _stateDoc.getStartApplyingDonorOpTime();
startMigrationDonorTimestamp =
_stateDoc.getStartMigrationDonorTimestamp();
}
auto majoritySnapshotOpTime = _getDonorMajorityOpTime(client);
if (majoritySnapshotOpTime.getTimestamp() < startMigrationDonorTimestamp) {
stdx::lock_guard lk(_mutex);
const auto now = getGlobalServiceContext()->getFastClockSource()->now();
_excludeDonorHost(
lk,
serverAddress,
now + Milliseconds(tenantMigrationExcludeDonorHostTimeoutMS));
uasserted(
kDelayedMajorityOpTimeErrorCode,
str::stream()
<< "majoritySnapshotOpTime on donor host must not be behind "
"startMigrationDonorTimestamp, majoritySnapshotOpTime: "
<< majoritySnapshotOpTime.toString()
<< "; startMigrationDonorTimestamp: "
<< startMigrationDonorTimestamp.toString());
}
if (startApplyingOpTime && majoritySnapshotOpTime < *startApplyingOpTime) {
stdx::lock_guard lk(_mutex);
const auto now = getGlobalServiceContext()->getFastClockSource()->now();
_excludeDonorHost(
lk,
serverAddress,
now + Milliseconds(tenantMigrationExcludeDonorHostTimeoutMS));
uasserted(
kDelayedMajorityOpTimeErrorCode,
str::stream()
<< "majoritySnapshotOpTime on donor host must not be behind "
"startApplyingDonorOpTime, majoritySnapshotOpTime: "
<< majoritySnapshotOpTime.toString()
<< "; startApplyingDonorOpTime: "
<< (*startApplyingOpTime).toString());
}
// Application name is constructed such that it doesn't exceed
// kMaxApplicationNameByteLength (128 bytes).
// "TenantMigration_" (16 bytes) + <tenantId> (61 bytes) + "_" (1 byte) +
// <migrationUuid> (36 bytes) + _oplogFetcher" (13 bytes) = 127 bytes
// length.
applicationName += "_oplogFetcher";
auto oplogFetcherClient = _connectAndAuth(serverAddress, applicationName);
return ConnectionPair(std::move(client), std::move(oplogFetcherClient));
});
})
.until([this, self = shared_from_this(), kDelayedMajorityOpTimeErrorCode](
const StatusWith<ConnectionPair>& statusWith) {
auto status = statusWith.getStatus();
if (status.isOK()) {
return true;
}
LOGV2_ERROR(4880404,
"Connecting to donor failed",
"tenantId"_attr = getTenantId(),
"migrationId"_attr = getMigrationUUID(),
"error"_attr = status);
// Make sure we don't end up with a partially initialized set of connections.
stdx::lock_guard lk(_mutex);
_client = nullptr;
_oplogFetcherClient = nullptr;
// If the future chain has been interrupted, stop retrying.
if (_taskState.isInterrupted()) {
return true;
}
if (MONGO_unlikely(skipRetriesWhenConnectingToDonorHost.shouldFail())) {
LOGV2(5425600,
"skipRetriesWhenConnectingToDonorHost failpoint enabled, migration "
"proceeding with error from connecting to sync source");
return true;
}
/*
* Retry sync source selection if we encountered any of the following errors:
* 1) The RSM couldn't find a suitable donor host
* 2) The majority snapshot OpTime on the donor host was not ahead of our stored
* 'startApplyingDonorOpTime'
* 3) Some other retriable error
*/
if (status == ErrorCodes::FailedToSatisfyReadPreference ||
status == ErrorCodes::Error(kDelayedMajorityOpTimeErrorCode) ||
ErrorCodes::isRetriableError(status)) {
return false;
}
return true;
})
.on(**_scopedExecutor, CancelationToken::uncancelable())
.semi();
}
void TenantMigrationRecipientService::Instance::_excludeDonorHost(WithLock,
const HostAndPort& host,
Date_t until) {
LOGV2_DEBUG(5271800,
2,
"Excluding donor host",
"donorHost"_attr = host,
"until"_attr = until.toString());
_excludedDonorHosts.emplace_back(std::make_pair(host, until));
}
std::vector<HostAndPort> TenantMigrationRecipientService::Instance::_getExcludedDonorHosts(
WithLock lk) {
const auto now = getGlobalServiceContext()->getFastClockSource()->now();
// Clean up any hosts that have had their exclusion duration expired.
auto itr = std::remove_if(
_excludedDonorHosts.begin(),
_excludedDonorHosts.end(),
[now](const std::pair<HostAndPort, Date_t>& pair) { return pair.second < now; });
_excludedDonorHosts.erase(itr, _excludedDonorHosts.end());
// Return the list of currently excluded donor hosts.
std::vector<HostAndPort> excludedHosts;
std::transform(_excludedDonorHosts.begin(),
_excludedDonorHosts.end(),
std::back_inserter(excludedHosts),
[](const std::pair<HostAndPort, Date_t>& pair) { return pair.first; });
return excludedHosts;
}
SemiFuture<void> TenantMigrationRecipientService::Instance::_initializeStateDoc(WithLock) {
// If the instance state is not 'kUninitialized', then the instance is restarted by step up. So,
// skip persisting the state doc. 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 also 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 (_stateDoc.getState() != TenantMigrationRecipientStateEnum::kUninitialized) {
return SemiFuture<void>::makeReady();
}
LOGV2_DEBUG(5081400,
2,
"Recipient migration service initializing state document",
"tenantId"_attr = getTenantId(),
"migrationId"_attr = getMigrationUUID(),
"connectionString"_attr = _donorConnectionString,
"readPreference"_attr = _readPreference);
// Persist the state doc before starting the data sync.
_stateDoc.setState(TenantMigrationRecipientStateEnum::kStarted);
return ExecutorFuture(**_scopedExecutor)
.then([this, self = shared_from_this(), stateDoc = _stateDoc] {
auto opCtx = cc().makeOperationContext();
{
Lock::ExclusiveLock stateDocInsertLock(
opCtx.get(), opCtx->lockState(), _recipientService->_stateDocInsertMutex);
uassertStatusOK(
tenantMigrationRecipientEntryHelpers::insertStateDoc(opCtx.get(), stateDoc));
}
if (MONGO_unlikely(
failWhilePersistingTenantMigrationRecipientInstanceStateDoc.shouldFail())) {
LOGV2(4878500, "Persisting state doc failed due to fail point enabled.");
uasserted(
ErrorCodes::NotWritablePrimary,
"Persisting state doc failed - "
"'failWhilePersistingTenantMigrationRecipientInstanceStateDoc' fail point "
"active");
}
// Wait for the state doc to be majority replicated to make sure that the state doc
// doesn't rollback.
auto writeOpTime = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
return WaitForMajorityService::get(opCtx->getServiceContext())
.waitUntilMajority(writeOpTime);
})
.semi();
}
void TenantMigrationRecipientService::Instance::_getStartOpTimesFromDonor(WithLock lk) {
if (_sharedData->isResuming()) {
// We are resuming a migration.
return;
}
// We only expect to already have start optimes populated if we are resuming a migration.
invariant(!_stateDoc.getStartApplyingDonorOpTime().has_value());
invariant(!_stateDoc.getStartFetchingDonorOpTime().has_value());
// Get the last oplog entry at the read concern majority optime in the remote oplog. It
// does not matter which tenant it is for.
auto lastOplogEntry1OpTime = _getDonorMajorityOpTime(_client);
LOGV2_DEBUG(4880600,
2,
"Found last oplog entry at read concern majority optime on remote node",
"migrationId"_attr = getMigrationUUID(),
"tenantId"_attr = _stateDoc.getTenantId(),
"lastOplogEntry"_attr = lastOplogEntry1OpTime.toBSON());
// Get the optime of the earliest transaction that was open at the read concern majority optime
// As with the last oplog entry, it does not matter that this may be for a different tenant; an
// optime that is too early does not result in incorrect behavior.
const auto preparedState = DurableTxnState_serializer(DurableTxnStateEnum::kPrepared);
const auto inProgressState = DurableTxnState_serializer(DurableTxnStateEnum::kInProgress);
auto transactionTableOpTimeFields = BSON(SessionTxnRecord::kStartOpTimeFieldName << 1);
auto earliestOpenTransactionBson = _client->findOne(
NamespaceString::kSessionTransactionsTableNamespace.ns(),
QUERY("state" << BSON("$in" << BSON_ARRAY(preparedState << inProgressState)))
.sort(SessionTxnRecord::kStartOpTimeFieldName.toString(), 1),
&transactionTableOpTimeFields,
QueryOption_SecondaryOk,
ReadConcernArgs(ReadConcernLevel::kMajorityReadConcern).toBSONInner());
LOGV2_DEBUG(4880602,
2,
"Transaction table entry for earliest transaction that was open at the read "
"concern majority optime on remote node (may be empty)",
"migrationId"_attr = getMigrationUUID(),
"tenantId"_attr = _stateDoc.getTenantId(),
"earliestOpenTransaction"_attr = earliestOpenTransactionBson);
pauseAfterRetrievingLastTxnMigrationRecipientInstance.pauseWhileSet();
// We need to fetch the last oplog entry both before and after getting the transaction
// table entry, as otherwise there is a potential race where we may try to apply
// a commit for which we have not fetched a previous transaction oplog entry.
auto lastOplogEntry2OpTime = _getDonorMajorityOpTime(_client);
LOGV2_DEBUG(4880604,
2,
"Found last oplog entry at the read concern majority optime (after reading txn "
"table) on remote node",
"migrationId"_attr = getMigrationUUID(),
"tenantId"_attr = _stateDoc.getTenantId(),
"lastOplogEntry"_attr = lastOplogEntry2OpTime.toBSON());
_stateDoc.setStartApplyingDonorOpTime(lastOplogEntry2OpTime);
OpTime startFetchingDonorOpTime = lastOplogEntry1OpTime;
if (!earliestOpenTransactionBson.isEmpty()) {
auto startOpTimeField =
earliestOpenTransactionBson[SessionTxnRecord::kStartOpTimeFieldName];
if (startOpTimeField.isABSONObj()) {
startFetchingDonorOpTime = OpTime::parse(startOpTimeField.Obj());
}
}
_stateDoc.setStartFetchingDonorOpTime(startFetchingDonorOpTime);
}
AggregateCommand TenantMigrationRecipientService::Instance::_makeCommittedTransactionsAggregation()
const {
auto opCtx = cc().makeOperationContext();
auto expCtx = makeExpressionContext(opCtx.get());
Timestamp startFetchingTimestamp;
{
stdx::lock_guard lk(_mutex);
invariant(_stateDoc.getStartFetchingDonorOpTime());
startFetchingTimestamp = _stateDoc.getStartFetchingDonorOpTime().get().getTimestamp();
}
auto serializedPipeline =
tenant_migration_util::createCommittedTransactionsPipelineForTenantMigrations(
expCtx, startFetchingTimestamp, getTenantId())
->serializeToBson();
AggregateCommand aggRequest(NamespaceString::kSessionTransactionsTableNamespace,
std::move(serializedPipeline));
auto readConcern = repl::ReadConcernArgs(
boost::optional<LogicalTime>(startFetchingTimestamp),
boost::optional<repl::ReadConcernLevel>(repl::ReadConcernLevel::kMajorityReadConcern));
aggRequest.setReadConcern(readConcern.toBSONInner());
aggRequest.setHint(BSON(SessionTxnRecord::kSessionIdFieldName << 1));
aggRequest.setCursor(SimpleCursorOptions());
// We must set a writeConcern on internal commands.
aggRequest.setWriteConcern(WriteConcernOptions());
return aggRequest;
}
void TenantMigrationRecipientService::Instance::_processCommittedTransactionEntry(
const BSONObj& entry) {
auto sessionTxnRecord =
SessionTxnRecord::parse(IDLParserErrorContext("SessionTxnRecord"), entry);
auto sessionId = sessionTxnRecord.getSessionId();
auto txnNumber = sessionTxnRecord.getTxnNum();
auto uniqueOpCtx = cc().makeOperationContext();
auto opCtx = uniqueOpCtx.get();
// If the tenantMigrationRecipientInfo is set on the opCtx, we will set the
// 'fromTenantMigration' field when writing oplog entries. That field is used to help recipient
// secondaries determine if a no-op entry is related to a transaction entry.
tenantMigrationRecipientInfo(opCtx) =
boost::make_optional<TenantMigrationRecipientInfo>(getMigrationUUID());
opCtx->setLogicalSessionId(sessionId);
opCtx->setTxnNumber(txnNumber);
opCtx->setInMultiDocumentTransaction();
MongoDOperationContextSession ocs(opCtx);
LOGV2_DEBUG(5351301,
1,
"Migration attempting to commit transaction",
"sessionId"_attr = sessionId,
"txnNumber"_attr = txnNumber,
"tenantId"_attr = getTenantId(),
"migrationId"_attr = getMigrationUUID());
auto txnParticipant = TransactionParticipant::get(opCtx);
uassert(5351300,
str::stream() << "Migration failed to get transaction participant for transaction "
<< txnNumber << " on session " << sessionId,
txnParticipant);
// If the entry's transaction number is stale/older than the current active transaction number
// on the participant, fail the migration.
uassert(ErrorCodes::TransactionTooOld,
str::stream() << "Migration cannot apply transaction " << txnNumber << " on session "
<< sessionId << " because a newer transaction "
<< txnParticipant.getActiveTxnNumber() << " has already started",
txnParticipant.getActiveTxnNumber() <= txnNumber);
if (txnParticipant.getActiveTxnNumber() == txnNumber) {
// If the txn numbers are equal, move on to the next entry.
return;
}
txnParticipant.beginOrContinueTransactionUnconditionally(opCtx, txnNumber);
MutableOplogEntry noopEntry;
noopEntry.setOpType(repl::OpTypeEnum::kNoop);
noopEntry.setNss({});
noopEntry.setObject({});
noopEntry.setWallClockTime(opCtx->getServiceContext()->getFastClockSource()->now());
noopEntry.setSessionId(sessionId);
noopEntry.setTxnNumber(txnNumber);
// Use the same wallclock time as the noop entry.
sessionTxnRecord.setStartOpTime(boost::none);
sessionTxnRecord.setLastWriteOpTime(OpTime());
sessionTxnRecord.setLastWriteDate(noopEntry.getWallClockTime());
AutoGetOplog oplogWrite(opCtx, OplogAccessMode::kWrite);
writeConflictRetry(
opCtx, "writeDonorCommittedTxnEntry", NamespaceString::kRsOplogNamespace.ns(), [&] {
WriteUnitOfWork wuow(opCtx);
// Write the no-op entry and update 'config.transactions'.
repl::logOp(opCtx, &noopEntry);
TransactionParticipant::get(opCtx).onWriteOpCompletedOnPrimary(
opCtx, {}, sessionTxnRecord);
wuow.commit();
});
// Invalidate in-memory state so that the next time the session is checked out, it would reload
// the transaction state from 'config.transactions'.
txnParticipant.invalidate(opCtx);
if (MONGO_unlikely(hangAfterUpdatingTransactionEntry.shouldFail())) {
LOGV2(5351400, "hangAfterUpdatingTransactionEntry failpoint enabled");
hangAfterUpdatingTransactionEntry.pauseWhileSet();
}
}
SemiFuture<void>
TenantMigrationRecipientService::Instance::_fetchCommittedTransactionsBeforeStartOpTime() {
if (MONGO_unlikely(skipFetchingCommittedTransactions.shouldFail())) { // Test-only.
return SemiFuture<void>::makeReady();
}
{
stdx::lock_guard lk(_mutex);
if (_stateDoc.getCompletedUpdatingTransactionsBeforeStartOpTime()) {
LOGV2_DEBUG(
5351401,
2,
"Already completed fetching committed transactions from donor, skipping stage",
"migrationId"_attr = getMigrationUUID(),
"tenantId"_attr = getTenantId());
return SemiFuture<void>::makeReady();
}
}
auto aggRequest = _makeCommittedTransactionsAggregation();
auto statusWith = DBClientCursor::fromAggregationRequest(
_client.get(), std::move(aggRequest), true /* secondaryOk */, false /* useExhaust */);
if (!statusWith.isOK()) {
LOGV2_ERROR(5351100,
"Fetch committed transactions aggregation failed",
"error"_attr = statusWith.getStatus());
uassertStatusOK(statusWith.getStatus());
}
auto cursor = statusWith.getValue().get();
while (cursor->more()) {
auto transactionEntry = cursor->next();
_processCommittedTransactionEntry(transactionEntry);
stdx::lock_guard lk(_mutex);
if (_taskState.isInterrupted()) {
uassertStatusOK(_taskState.getInterruptStatus());
}
}
stdx::lock_guard lk(_mutex);
_stateDoc.setCompletedUpdatingTransactionsBeforeStartOpTime(true);
return ExecutorFuture(**_scopedExecutor)
.then([this, self = shared_from_this(), stateDoc = _stateDoc] {
auto opCtx = cc().makeOperationContext();
uassertStatusOK(
tenantMigrationRecipientEntryHelpers::updateStateDoc(opCtx.get(), stateDoc));
})
.semi();
}