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/**
* Copyright (C) 2018-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::kCommand
#include "mongo/platform/basic.h"
#include "mongo/db/commands/feature_compatibility_version.h"
#include <fmt/format.h>
#include "mongo/base/status.h"
#include "mongo/db/catalog_raii.h"
#include "mongo/db/commands/feature_compatibility_version_documentation.h"
#include "mongo/db/commands/feature_compatibility_version_gen.h"
#include "mongo/db/commands/feature_compatibility_version_parser.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/optime.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/repl/replication_process.h"
#include "mongo/db/repl/storage_interface.h"
#include "mongo/db/s/collection_sharding_state.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/storage_engine.h"
#include "mongo/db/wire_version.h"
#include "mongo/db/write_concern_options.h"
#include "mongo/logv2/log.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/transport/service_entry_point.h"
namespace mongo {
using repl::UnreplicatedWritesBlock;
using FCVP = FeatureCompatibilityVersionParser;
using FCVParams = ServerGlobalParams::FeatureCompatibility;
using FCV = FCVParams::Version;
using namespace fmt::literals;
namespace {
/**
* Utility class for recording permitted transitions between feature compatibility versions and
* their on-disk representation as FeatureCompatibilityVersionDocument objects.
*/
const class FCVTransitions {
public:
FCVTransitions() {
auto makeFCVDoc = [](
// What features we support during the transition.
FCV effectiveVersion,
// The transition's goal FCV.
boost::optional<FCV> targetVersion = boost::none,
// The previous FCV while downgrading.
boost::optional<FCV> previousVersion = boost::none) {
FeatureCompatibilityVersionDocument fcvDoc;
fcvDoc.setVersion(effectiveVersion);
fcvDoc.setTargetVersion(targetVersion);
fcvDoc.setPreviousVersion(previousVersion);
return fcvDoc;
};
// Steady states - they have FCV documents but no _transitions entries.
for (auto fcv :
std::vector{FCVParams::kLastLTS, FCVParams::kLastContinuous, FCVParams::kLatest}) {
_fcvDocuments[fcv] = makeFCVDoc(fcv);
}
for (auto [from, upgrading, to] :
std::vector{std::make_tuple(FCVParams::kLastLTS,
FCVParams::kUpgradingFromLastLTSToLatest,
FCVParams::kLatest),
std::make_tuple(FCVParams::kLastContinuous,
FCVParams::kUpgradingFromLastContinuousToLatest,
FCVParams::kLatest)}) {
for (auto isFromConfigServer : std::vector{false, true}) {
// Start or complete upgrading to latest. If this release's lastContinuous ==
// lastLTS then the second loop iteration just overwrites the first.
_transitions[{from, to, isFromConfigServer}] = upgrading;
_transitions[{upgrading, to, isFromConfigServer}] = to;
}
_fcvDocuments[upgrading] = makeFCVDoc(from /* effective */, to /* target */);
}
if (FCVParams::kLastLTS != FCVParams::kLastContinuous) {
// Only config servers may request an upgrade from lastLTS to lastContinuous.
_transitions[{FCVParams::kLastLTS, FCVParams::kLastContinuous, true}] =
FCVParams::kUpgradingFromLastLTSToLastContinuous;
_transitions[{FCVParams::kUpgradingFromLastLTSToLastContinuous,
FCVParams::kLastContinuous,
true}] = FCVParams::kLastContinuous;
_fcvDocuments[FCVParams::kUpgradingFromLastLTSToLastContinuous] = makeFCVDoc(
FCVParams::kLastLTS /* effective */, FCVParams::kLastContinuous /* target */);
}
for (auto [downgrading, to] :
std::vector{std::make_tuple(FCVParams::kDowngradingFromLatestToLastContinuous,
FCVParams::kLastContinuous),
std::make_tuple(FCVParams::kDowngradingFromLatestToLastLTS,
FCVParams::kLastLTS)}) {
for (auto isFromConfigServer : std::vector{false, true}) {
// Start or complete downgrade from latest. If this release's lastContinuous ==
// lastLTS then the second loop iteration just overwrites the first.
_transitions[{FCVParams::kLatest, to, isFromConfigServer}] = downgrading;
_transitions[{downgrading, to, isFromConfigServer}] = to;
}
_fcvDocuments[downgrading] =
makeFCVDoc(to /* effective */, to /* target */, FCVParams::kLatest /* previous */
);
}
}
/**
* True if a server in ServerGlobalParams::FeatureCompatibility::Version "fromVersion" can
* transition to "newVersion". Different rules apply if the request is from a config server.
*/
bool permitsTransition(FCV fromVersion, FCV newVersion, bool isFromConfigServer) const {
return _transitions.find({fromVersion, newVersion, isFromConfigServer}) !=
_transitions.end();
}
/**
* Get a feature compatibility version enum value from a document representing the
* ServerGlobalParams::FeatureCompatibility::Version, or uassert if the document is invalid.
*/
FCV versionFromFCVDoc(const FeatureCompatibilityVersionDocument& fcvDoc) const {
auto it = std::find_if(_fcvDocuments.begin(), _fcvDocuments.end(), [&](const auto& value) {
return value.second == fcvDoc;
});
uassert(5147400, "invalid feature compatibility document", it != _fcvDocuments.end());
return it->first;
}
/**
* Return an FCV representing the transition fromVersion -> newVersion. It may be transitional
* (such as kUpgradingFromLastLTSToLastContinuous) or not (such as kLastLTS). Different rules
* apply if the upgrade/downgrade request is from a config server.
*/
FCV getTransitionalVersion(FCV fromVersion, FCV newVersion, bool isFromConfigServer) const {
auto it = _transitions.find({fromVersion, newVersion, isFromConfigServer});
fassert(5147401, it != _transitions.end());
return it->second;
}
/**
* Get the document representation of a (perhaps transitional) version.
*/
FeatureCompatibilityVersionDocument getFCVDocument(FCV currentVersion) const {
auto it = _fcvDocuments.find(currentVersion);
fassert(5147402, it != _fcvDocuments.end());
return it->second;
}
private:
stdx::unordered_map<FCV, FeatureCompatibilityVersionDocument> _fcvDocuments;
// Map: (fromVersion, newVersion, isFromConfigServer) -> transitional version.
stdx::unordered_map<std::tuple<FCV, FCV, bool>, FCV> _transitions;
} fcvTransitions;
/**
* Taken in shared mode by any operations that need to ensure that the FCV does not change during
* its execution.
*
* setFCV takes this lock in exclusive mode when changing the FCV value.
*/
Lock::ResourceMutex fcvLock("featureCompatibilityVersionLock");
bool isWriteableStorageEngine() {
return !storageGlobalParams.readOnly && (storageGlobalParams.engine != "devnull");
}
/**
* Build update command for featureCompatibilityVersion document updates.
*/
void runUpdateCommand(OperationContext* opCtx, const FeatureCompatibilityVersionDocument& fcvDoc) {
DBDirectClient client(opCtx);
NamespaceString nss(NamespaceString::kServerConfigurationNamespace);
BSONObjBuilder updateCmd;
updateCmd.append("update", nss.coll());
{
BSONArrayBuilder updates(updateCmd.subarrayStart("updates"));
{
BSONObjBuilder updateSpec(updates.subobjStart());
{
BSONObjBuilder queryFilter(updateSpec.subobjStart("q"));
queryFilter.append("_id", FeatureCompatibilityVersionParser::kParameterName);
}
{
BSONObjBuilder updateMods(updateSpec.subobjStart("u"));
fcvDoc.serialize(&updateMods);
}
updateSpec.appendBool("upsert", true);
}
}
auto timeout = opCtx->getWriteConcern().usedDefault ? WriteConcernOptions::kNoTimeout
: opCtx->getWriteConcern().wTimeout;
auto newWC = WriteConcernOptions(
WriteConcernOptions::kMajority, WriteConcernOptions::SyncMode::UNSET, timeout);
updateCmd.append(WriteConcernOptions::kWriteConcernField, newWC.toBSON());
// Update the featureCompatibilityVersion document stored in the server configuration
// collection.
BSONObj updateResult;
client.runCommand(nss.db().toString(), updateCmd.obj(), updateResult);
uassertStatusOK(getStatusFromWriteCommandReply(updateResult));
}
} // namespace
boost::optional<BSONObj> FeatureCompatibilityVersion::findFeatureCompatibilityVersionDocument(
OperationContext* opCtx) {
AutoGetOrCreateDb autoDb(opCtx, NamespaceString::kServerConfigurationNamespace.db(), MODE_IX);
const auto query = BSON("_id" << FeatureCompatibilityVersionParser::kParameterName);
const auto swFcv = repl::StorageInterface::get(opCtx)->findById(
opCtx, NamespaceString::kServerConfigurationNamespace, query["_id"]);
if (!swFcv.isOK()) {
return boost::none;
}
return swFcv.getValue();
}
void FeatureCompatibilityVersion::validateSetFeatureCompatibilityVersionRequest(
OperationContext* opCtx, const SetFeatureCompatibilityVersion& setFCVRequest, FCV fromVersion) {
auto newVersion = setFCVRequest.getCommandParameter();
auto isFromConfigServer = setFCVRequest.getFromConfigServer().value_or(false);
uassert(
5147403,
"cannot set featureCompatibilityVersion to '{}' while featureCompatibilityVersion is '{}'"_format(
FCVP::toString(newVersion), FCVP::toString(fromVersion)),
fcvTransitions.permitsTransition(fromVersion, newVersion, isFromConfigServer));
auto setFCVPhase = setFCVRequest.getPhase();
if (!isFromConfigServer || !setFCVPhase) {
return;
}
auto changeTimestamp = setFCVRequest.getChangeTimestamp();
invariant(changeTimestamp);
auto fcvObj = findFeatureCompatibilityVersionDocument(opCtx);
auto fcvDoc = FeatureCompatibilityVersionDocument::parse(
IDLParserErrorContext("featureCompatibilityVersionDocument"), fcvObj.get());
auto previousTimestamp = fcvDoc.getChangeTimestamp();
if (setFCVPhase == SetFCVPhaseEnum::kStart) {
uassert(
5563501,
"Shard received a timestamp for phase 1 of the 'setFeatureCompatibilityVersion' "
"command which is too old, so the request is discarded. This may indicate that it is a "
"request related to a previous invocation of the 'setFeatureCompatibilityVersion' "
"command which, for example, was temporarily stuck on a router.",
previousTimestamp && previousTimestamp > changeTimestamp);
} else {
uassert(5563601,
"Cannot transition to fully upgraded or fully downgraded state if the shard is not "
"in kUpgrading or kDowngrading state",
serverGlobalParams.featureCompatibility.isUpgradingOrDowngrading());
tassert(5563502,
"Shard received a timestamp for phase-2 of the 'setFeatureCompatibilityVersion' "
"command that does not match the one received for phase-1, so the request is "
"discarded. This may indicate that it is a request related to a previous "
"invocation of the 'setFeatureCompatibilityVersion' command which, for example, "
"was temporarily stuck on a router.",
!previousTimestamp || previousTimestamp < changeTimestamp);
uassert(
5563503,
"Shard received a timestamp for phase-2 of the 'setFeatureCompatibilityVersion' "
"command which is too old, so the request is discarded. This may indicate that it is a "
"request related to a previous invocation of the 'setFeatureCompatibilityVersion' "
"command which, for example, was temporarily stuck on a router.",
previousTimestamp > changeTimestamp);
}
}
void FeatureCompatibilityVersion::updateFeatureCompatibilityVersionDocument(
OperationContext* opCtx,
ServerGlobalParams::FeatureCompatibility::Version fromVersion,
ServerGlobalParams::FeatureCompatibility::Version newVersion,
bool isFromConfigServer,
boost::optional<Timestamp> changeTimestamp,
bool setTargetVersion) {
// Only transition to fully upgraded or downgraded states when we
// have completed all required upgrade/downgrade behavior.
auto transitioningVersion = setTargetVersion &&
serverGlobalParams.featureCompatibility.isUpgradingOrDowngrading(fromVersion)
? fromVersion
: fcvTransitions.getTransitionalVersion(fromVersion, newVersion, isFromConfigServer);
FeatureCompatibilityVersionDocument fcvDoc =
fcvTransitions.getFCVDocument(transitioningVersion);
// The timestamp must be removed when downgrading to version 4.9 or 4.4. This is necessary to
// avoid the presence of an unknown field that old binaries are unable to deserialize.
if (transitioningVersion == ServerGlobalParams::FeatureCompatibility::Version::kVersion49 ||
transitioningVersion ==
ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo44) {
fcvDoc.setChangeTimestamp(boost::none);
} else {
fcvDoc.setChangeTimestamp(changeTimestamp);
}
runUpdateCommand(opCtx, fcvDoc);
}
void FeatureCompatibilityVersion::setIfCleanStartup(OperationContext* opCtx,
repl::StorageInterface* storageInterface) {
if (!isCleanStartUp())
return;
// If the server was not started with --shardsvr, the default featureCompatibilityVersion on
// clean startup is the upgrade version. If it was started with --shardsvr, the default
// featureCompatibilityVersion is the downgrade version, so that it can be safely added to a
// downgrade version cluster. The config server will run setFeatureCompatibilityVersion as part
// of addShard.
const bool storeUpgradeVersion = serverGlobalParams.clusterRole != ClusterRole::ShardServer;
UnreplicatedWritesBlock unreplicatedWritesBlock(opCtx);
NamespaceString nss(NamespaceString::kServerConfigurationNamespace);
{
CollectionOptions options;
options.uuid = CollectionUUID::gen();
uassertStatusOK(storageInterface->createCollection(opCtx, nss, options));
}
FeatureCompatibilityVersionDocument fcvDoc;
if (storeUpgradeVersion) {
fcvDoc.setVersion(FCVParams::kLatest);
} else {
fcvDoc.setVersion(FCVParams::kLastLTS);
}
// We then insert the featureCompatibilityVersion document into the server configuration
// collection. The server parameter will be updated on commit by the op observer.
uassertStatusOK(storageInterface->insertDocument(
opCtx,
nss,
repl::TimestampedBSONObj{fcvDoc.toBSON(), Timestamp()},
repl::OpTime::kUninitializedTerm)); // No timestamp or term because this write is not
// replicated.
}
bool FeatureCompatibilityVersion::isCleanStartUp() {
StorageEngine* storageEngine = getGlobalServiceContext()->getStorageEngine();
std::vector<std::string> dbNames = storageEngine->listDatabases();
for (auto&& dbName : dbNames) {
if (dbName != "local") {
return false;
}
}
return true;
}
void FeatureCompatibilityVersion::updateMinWireVersion() {
WireSpec& wireSpec = WireSpec::instance();
const auto currentFcv = serverGlobalParams.featureCompatibility.getVersion();
if (currentFcv == FCVParams::kLatest ||
(serverGlobalParams.featureCompatibility.isUpgradingOrDowngrading() &&
currentFcv != FCVParams::kUpgradingFromLastLTSToLastContinuous)) {
// FCV == kLatest or FCV is upgrading/downgrading to or from kLatest.
WireSpec::Specification newSpec = *wireSpec.get();
newSpec.incomingInternalClient.minWireVersion = LATEST_WIRE_VERSION;
newSpec.outgoing.minWireVersion = LATEST_WIRE_VERSION;
wireSpec.reset(std::move(newSpec));
} else if (currentFcv == FCVParams::kUpgradingFromLastLTSToLastContinuous ||
currentFcv == FCVParams::kLastContinuous) {
// FCV == kLastContinuous or upgrading to kLastContinuous.
WireSpec::Specification newSpec = *wireSpec.get();
newSpec.incomingInternalClient.minWireVersion = LAST_CONT_WIRE_VERSION;
newSpec.outgoing.minWireVersion = LAST_CONT_WIRE_VERSION;
wireSpec.reset(std::move(newSpec));
} else {
invariant(currentFcv == FCVParams::kLastLTS);
WireSpec::Specification newSpec = *wireSpec.get();
newSpec.incomingInternalClient.minWireVersion = LAST_LTS_WIRE_VERSION;
newSpec.outgoing.minWireVersion = LAST_LTS_WIRE_VERSION;
wireSpec.reset(std::move(newSpec));
}
}
void FeatureCompatibilityVersion::initializeForStartup(OperationContext* opCtx) {
// Global write lock must be held.
invariant(opCtx->lockState()->isW());
auto featureCompatibilityVersion = findFeatureCompatibilityVersionDocument(opCtx);
if (!featureCompatibilityVersion) {
return;
}
// If the server configuration collection already contains a valid featureCompatibilityVersion
// document, cache it in-memory as a server parameter.
auto swVersion = FeatureCompatibilityVersionParser::parse(*featureCompatibilityVersion);
// Note this error path captures all cases of an FCV document existing, but with any
// unacceptable value. This includes unexpected cases with no path forward such as the FCV value
// not being a string.
if (!swVersion.isOK()) {
uassertStatusOK({ErrorCodes::MustDowngrade,
str::stream()
<< "UPGRADE PROBLEM: Found an invalid featureCompatibilityVersion "
"document (ERROR: "
<< swVersion.getStatus()
<< "). If the current featureCompatibilityVersion is below 4.4, see "
"the documentation on upgrading at "
<< feature_compatibility_version_documentation::kUpgradeLink << "."});
}
auto version = swVersion.getValue();
serverGlobalParams.mutableFeatureCompatibility.setVersion(version);
FeatureCompatibilityVersion::updateMinWireVersion();
// On startup, if the version is in an upgrading or downgrading state, print a warning.
if (serverGlobalParams.featureCompatibility.isUpgradingOrDowngrading()) {
LOGV2_WARNING_OPTIONS(
4978301,
{logv2::LogTag::kStartupWarnings},
"A featureCompatibilityVersion upgrade/downgrade did not complete. To fix this, use "
"the setFeatureCompatibilityVersion command to resume the upgrade/downgrade",
"currentfeatureCompatibilityVersion"_attr =
FeatureCompatibilityVersionParser::toString(version));
}
}
// Fatally asserts if the featureCompatibilityVersion document is not initialized, when required.
void FeatureCompatibilityVersion::fassertInitializedAfterStartup(OperationContext* opCtx) {
Lock::GlobalWrite lk(opCtx);
const auto replProcess = repl::ReplicationProcess::get(opCtx);
const auto& replSettings = repl::ReplicationCoordinator::get(opCtx)->getSettings();
// The node did not complete the last initial sync. If the initial sync flag is set and we are
// part of a replica set, we expect the version to be initialized as part of initial sync after
// startup.
bool needInitialSync = replSettings.usingReplSets() && replProcess &&
replProcess->getConsistencyMarkers()->getInitialSyncFlag(opCtx);
if (needInitialSync) {
return;
}
auto fcvDocument = findFeatureCompatibilityVersionDocument(opCtx);
auto const storageEngine = opCtx->getServiceContext()->getStorageEngine();
auto dbNames = storageEngine->listDatabases();
bool nonLocalDatabases = std::any_of(dbNames.begin(), dbNames.end(), [](auto name) {
return name != NamespaceString::kLocalDb;
});
// Fail to start up if there is no featureCompatibilityVersion document and there are non-local
// databases present.
if (!fcvDocument && nonLocalDatabases) {
LOGV2_FATAL_NOTRACE(40652,
"Unable to start up mongod due to missing featureCompatibilityVersion "
"document. Please run with --repair to restore the document.");
}
// If we are part of a replica set and are started up with no data files, we do not set the
// featureCompatibilityVersion until a primary is chosen. For this case, we expect the in-memory
// featureCompatibilityVersion parameter to still be uninitialized until after startup.
if (isWriteableStorageEngine() && (!replSettings.usingReplSets() || nonLocalDatabases)) {
invariant(serverGlobalParams.featureCompatibility.isVersionInitialized());
}
}
Lock::ExclusiveLock FeatureCompatibilityVersion::enterFCVChangeRegion(OperationContext* opCtx) {
invariant(!opCtx->lockState()->isLocked());
return Lock::ExclusiveLock(opCtx->lockState(), fcvLock);
}
/**
* Read-only server parameter for featureCompatibilityVersion.
*/
// No ability to specify 'none' as set_at type,
// so use 'startup' in the IDL file, then override to none here.
FeatureCompatibilityVersionParameter::FeatureCompatibilityVersionParameter(StringData name,
ServerParameterType)
: ServerParameter(ServerParameterSet::getGlobal(), name, false, false) {}
void FeatureCompatibilityVersionParameter::append(OperationContext* opCtx,
BSONObjBuilder& b,
const std::string& name) {
uassert(ErrorCodes::UnknownFeatureCompatibilityVersion,
str::stream() << name << " is not yet known.",
serverGlobalParams.featureCompatibility.isVersionInitialized());
BSONObjBuilder featureCompatibilityVersionBuilder(b.subobjStart(name));
auto version = serverGlobalParams.featureCompatibility.getVersion();
FeatureCompatibilityVersionDocument fcvDoc = fcvTransitions.getFCVDocument(version);
featureCompatibilityVersionBuilder.appendElements(fcvDoc.toBSON().removeField("_id"));
}
Status FeatureCompatibilityVersionParameter::setFromString(const std::string&) {
return {ErrorCodes::IllegalOperation,
str::stream() << name() << " cannot be set via setParameter. See "
<< feature_compatibility_version_documentation::kCompatibilityLink
<< "."};
}
FixedFCVRegion::FixedFCVRegion(OperationContext* opCtx)
: _lk([&] {
invariant(!opCtx->lockState()->isLocked());
return Lock::SharedLock(opCtx->lockState(), fcvLock);
}()) {}
FixedFCVRegion::~FixedFCVRegion() = default;
const ServerGlobalParams::FeatureCompatibility& FixedFCVRegion::operator*() const {
return serverGlobalParams.featureCompatibility;
}
const ServerGlobalParams::FeatureCompatibility* FixedFCVRegion::operator->() const {
return &serverGlobalParams.featureCompatibility;
}
bool FixedFCVRegion::operator==(
const ServerGlobalParams::FeatureCompatibility::Version& other) const {
return serverGlobalParams.featureCompatibility.getVersion() == other;
}
bool FixedFCVRegion::operator!=(
const ServerGlobalParams::FeatureCompatibility::Version& other) const {
return !(*this == other);
}
} // namespace mongo
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