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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_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kStorage
#include "mongo/platform/basic.h"
#include "repair_database_and_check_version.h"
#include <functional>
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/collection_catalog_entry.h"
#include "mongo/db/catalog/create_collection.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/catalog/multi_index_block.h"
#include "mongo/db/commands/feature_compatibility_version.h"
#include "mongo/db/commands/feature_compatibility_version_documentation.h"
#include "mongo/db/commands/feature_compatibility_version_parser.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/dbhelpers.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repair_database.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/repl_set_member_in_standalone_mode.h"
#include "mongo/db/server_options.h"
#include "mongo/db/storage/storage_repair_observer.h"
#include "mongo/util/exit.h"
#include "mongo/util/fail_point.h"
#include "mongo/util/log.h"
#include "mongo/util/quick_exit.h"
#if !defined(_WIN32)
#include <sys/file.h>
#endif
namespace mongo {
// Exit after repair has started, but before data is repaired.
MONGO_FAIL_POINT_DEFINE(exitBeforeDataRepair);
// Exit after repairing data, but before the replica set configuration is invalidated.
MONGO_FAIL_POINT_DEFINE(exitBeforeRepairInvalidatesConfig);
namespace {
const std::string mustDowngradeErrorMsg = str::stream()
<< "UPGRADE PROBLEM: The data files need to be fully upgraded to version 4.0 before attempting "
"an upgrade to 4.2; see "
<< feature_compatibility_version_documentation::kUpgradeLink << " for more details.";
Status restoreMissingFeatureCompatibilityVersionDocument(OperationContext* opCtx,
const std::vector<std::string>& dbNames) {
NamespaceString fcvNss(NamespaceString::kServerConfigurationNamespace);
// If the admin database, which contains the server configuration collection with the
// featureCompatibilityVersion document, does not exist, create it.
auto databaseHolder = DatabaseHolder::get(opCtx);
auto db = databaseHolder->getDb(opCtx, fcvNss.db());
if (!db) {
log() << "Re-creating admin database that was dropped.";
}
db = databaseHolder->openDb(opCtx, fcvNss.db());
invariant(db);
// If the server configuration collection, which contains the FCV document, does not exist, then
// create it.
if (!db->getCollection(opCtx, NamespaceString::kServerConfigurationNamespace)) {
log() << "Re-creating the server configuration collection (admin.system.version) that was "
"dropped.";
uassertStatusOK(
createCollection(opCtx, fcvNss.db().toString(), BSON("create" << fcvNss.coll())));
}
Collection* fcvColl = db->getCollection(opCtx, NamespaceString::kServerConfigurationNamespace);
invariant(fcvColl);
// Restore the featureCompatibilityVersion document if it is missing.
BSONObj featureCompatibilityVersion;
if (!Helpers::findOne(opCtx,
fcvColl,
BSON("_id" << FeatureCompatibilityVersionParser::kParameterName),
featureCompatibilityVersion)) {
log() << "Re-creating featureCompatibilityVersion document that was deleted with version "
<< FeatureCompatibilityVersionParser::kVersion40 << ".";
BSONObj fcvObj = BSON("_id" << FeatureCompatibilityVersionParser::kParameterName
<< FeatureCompatibilityVersionParser::kVersionField
<< FeatureCompatibilityVersionParser::kVersion40);
writeConflictRetry(opCtx, "insertFCVDocument", fcvNss.ns(), [&] {
WriteUnitOfWork wunit(opCtx);
OpDebug* const nullOpDebug = nullptr;
uassertStatusOK(
fcvColl->insertDocument(opCtx, InsertStatement(fcvObj), nullOpDebug, false));
wunit.commit();
});
}
invariant(Helpers::findOne(opCtx,
fcvColl,
BSON("_id" << FeatureCompatibilityVersionParser::kParameterName),
featureCompatibilityVersion));
return Status::OK();
}
/**
* Returns true if the collection associated with the given CollectionCatalogEntry has an index on
* the _id field
*/
bool checkIdIndexExists(OperationContext* opCtx, const CollectionCatalogEntry* catalogEntry) {
auto indexCount = catalogEntry->getTotalIndexCount(opCtx);
auto indexNames = std::vector<std::string>(indexCount);
catalogEntry->getAllIndexes(opCtx, &indexNames);
for (auto name : indexNames) {
if (name == "_id_") {
return true;
}
}
return false;
}
Status buildMissingIdIndex(OperationContext* opCtx, Collection* collection) {
MultiIndexBlock indexer;
ON_BLOCK_EXIT([&] { indexer.cleanUpAfterBuild(opCtx, collection); });
const auto indexCatalog = collection->getIndexCatalog();
const auto idIndexSpec = indexCatalog->getDefaultIdIndexSpec();
auto swSpecs = indexer.init(opCtx, collection, idIndexSpec, MultiIndexBlock::kNoopOnInitFn);
if (!swSpecs.isOK()) {
return swSpecs.getStatus();
}
auto status = indexer.insertAllDocumentsInCollection(opCtx, collection);
if (!status.isOK()) {
return status;
}
status = indexer.checkConstraints(opCtx);
if (!status.isOK()) {
return status;
}
WriteUnitOfWork wuow(opCtx);
status = indexer.commit(
opCtx, collection, MultiIndexBlock::kNoopOnCreateEachFn, MultiIndexBlock::kNoopOnCommitFn);
wuow.commit();
return status;
}
/**
* Checks that all collections in the given list of 'dbNames' have valid properties for this version
* of MongoDB.
*
* This validates that all collections have UUIDs and an _id index. If a collection is missing an
* _id index, this function will build it.
*
* Returns a MustDowngrade error if any collections are missing UUIDs.
* Returns a MustDowngrade error if any index builds on the required _id field fail.
*/
Status ensureCollectionProperties(OperationContext* opCtx,
const std::vector<std::string>& dbNames) {
auto databaseHolder = DatabaseHolder::get(opCtx);
auto downgradeError = Status{ErrorCodes::MustDowngrade, mustDowngradeErrorMsg};
invariant(opCtx->lockState()->isW());
for (const auto& dbName : dbNames) {
auto db = databaseHolder->openDb(opCtx, dbName);
invariant(db);
for (auto collIt = db->begin(opCtx); collIt != db->end(opCtx); ++collIt) {
auto coll = *collIt;
if (!coll) {
break;
}
// We expect all collections to have UUIDs in MongoDB 4.2
if (!coll->uuid()) {
error() << "collection " << coll->ns() << " is missing a UUID";
return downgradeError;
}
// All user-created replicated collections created since MongoDB 4.0 have _id indexes.
auto requiresIndex = coll->requiresIdIndex() && coll->ns().isReplicated();
auto catalogEntry = coll->getCatalogEntry();
auto collOptions = catalogEntry->getCollectionOptions(opCtx);
auto hasAutoIndexIdField = collOptions.autoIndexId == CollectionOptions::YES;
// Even if the autoIndexId field is not YES, the collection may still have an _id index
// that was created manually by the user. Check the list of indexes to confirm index
// does not exist before attempting to build it or returning an error.
if (requiresIndex && !hasAutoIndexIdField && !checkIdIndexExists(opCtx, catalogEntry)) {
log() << "collection " << coll->ns() << " is missing an _id index; building it now";
auto status = buildMissingIdIndex(opCtx, coll);
if (!status.isOK()) {
error() << "could not build an _id index on collection " << coll->ns() << ": "
<< status;
return downgradeError;
}
}
}
}
return Status::OK();
}
const NamespaceString startupLogCollectionName("local.startup_log");
/**
* Returns 'true' if this server has a configuration document in local.system.replset.
*/
bool hasReplSetConfigDoc(OperationContext* opCtx) {
Lock::GlobalWrite lk(opCtx);
BSONObj config;
return Helpers::getSingleton(
opCtx, NamespaceString::kSystemReplSetNamespace.ns().c_str(), config);
}
/**
* Check that the oplog is capped, and abort the process if it is not.
* Caller must lock DB before calling this function.
*/
void checkForCappedOplog(OperationContext* opCtx, Database* db) {
const NamespaceString oplogNss(NamespaceString::kRsOplogNamespace);
invariant(opCtx->lockState()->isDbLockedForMode(oplogNss.db(), MODE_IS));
Collection* oplogCollection = db->getCollection(opCtx, oplogNss);
if (oplogCollection && !oplogCollection->isCapped()) {
severe() << "The oplog collection " << oplogNss
<< " is not capped; a capped oplog is a requirement for replication to function.";
fassertFailedNoTrace(40115);
}
}
void rebuildIndexes(OperationContext* opCtx, StorageEngine* storageEngine) {
std::vector<StorageEngine::CollectionIndexNamePair> indexesToRebuild =
fassert(40593, storageEngine->reconcileCatalogAndIdents(opCtx));
if (!indexesToRebuild.empty() && serverGlobalParams.indexBuildRetry) {
log() << "note: restart the server with --noIndexBuildRetry "
<< "to skip index rebuilds";
}
if (!serverGlobalParams.indexBuildRetry) {
log() << " not rebuilding interrupted indexes";
return;
}
// Determine which indexes need to be rebuilt. rebuildIndexesOnCollection() requires that all
// indexes on that collection are done at once, so we use a map to group them together.
StringMap<IndexNameObjs> nsToIndexNameObjMap;
for (auto&& indexNamespace : indexesToRebuild) {
NamespaceString collNss(indexNamespace.first);
const std::string& indexName = indexNamespace.second;
CollectionCatalogEntry* cce =
CollectionCatalog::get(opCtx).lookupCollectionCatalogEntryByNamespace(collNss);
invariant(cce,
str::stream() << "couldn't get collection catalog entry for collection "
<< collNss.toString());
auto swIndexSpecs = getIndexNameObjs(
opCtx, cce, [&indexName](const std::string& name) { return name == indexName; });
if (!swIndexSpecs.isOK() || swIndexSpecs.getValue().first.empty()) {
fassert(40590,
{ErrorCodes::InternalError,
str::stream() << "failed to get index spec for index " << indexName
<< " in collection "
<< collNss.toString()});
}
auto& indexesToRebuild = swIndexSpecs.getValue();
invariant(indexesToRebuild.first.size() == 1 && indexesToRebuild.second.size() == 1,
str::stream() << "Num Index Names: " << indexesToRebuild.first.size()
<< " Num Index Objects: "
<< indexesToRebuild.second.size());
auto& ino = nsToIndexNameObjMap[collNss.ns()];
ino.first.emplace_back(std::move(indexesToRebuild.first.back()));
ino.second.emplace_back(std::move(indexesToRebuild.second.back()));
}
for (const auto& entry : nsToIndexNameObjMap) {
NamespaceString collNss(entry.first);
auto collCatalogEntry =
CollectionCatalog::get(opCtx).lookupCollectionCatalogEntryByNamespace(collNss);
for (const auto& indexName : entry.second.first) {
log() << "Rebuilding index. Collection: " << collNss << " Index: " << indexName;
}
std::vector<BSONObj> indexSpecs = entry.second.second;
fassert(40592, rebuildIndexesOnCollection(opCtx, collCatalogEntry, indexSpecs));
}
}
/**
* Sets the appropriate flag on the service context decorable 'replSetMemberInStandaloneMode' to
* 'true' if this is a replica set node running in standalone mode, otherwise 'false'.
*/
void setReplSetMemberInStandaloneMode(OperationContext* opCtx) {
const repl::ReplSettings& replSettings =
repl::ReplicationCoordinator::get(opCtx)->getSettings();
if (replSettings.usingReplSets()) {
// Not in standalone mode.
setReplSetMemberInStandaloneMode(opCtx->getServiceContext(), false);
return;
}
invariant(opCtx->lockState()->isW());
Collection* collection = CollectionCatalog::get(opCtx).lookupCollectionByNamespace(
NamespaceString::kSystemReplSetNamespace);
if (collection && collection->numRecords(opCtx) > 0) {
setReplSetMemberInStandaloneMode(opCtx->getServiceContext(), true);
return;
}
setReplSetMemberInStandaloneMode(opCtx->getServiceContext(), false);
}
} // namespace
/**
* Return whether there are non-local databases. If there was an error becauses the wrong mongod
* version was used for these datafiles, a DBException with status ErrorCodes::MustDowngrade is
* thrown.
*/
bool repairDatabasesAndCheckVersion(OperationContext* opCtx) {
auto const storageEngine = opCtx->getServiceContext()->getStorageEngine();
Lock::GlobalWrite lk(opCtx);
std::vector<std::string> dbNames = storageEngine->listDatabases();
// Rebuilding indexes must be done before a database can be opened, except when using repair,
// which rebuilds all indexes when it is done.
if (!storageGlobalParams.readOnly && !storageGlobalParams.repair) {
// Determine whether this is a replica set node running in standalone mode. If we're in
// repair mode, we cannot set the flag yet as it needs to open a database and look through a
// collection. Rebuild the necessary indexes after setting the flag.
setReplSetMemberInStandaloneMode(opCtx);
rebuildIndexes(opCtx, storageEngine);
}
bool ensuredCollectionProperties = false;
// Repair all databases first, so that we do not try to open them if they are in bad shape
auto databaseHolder = DatabaseHolder::get(opCtx);
if (storageGlobalParams.repair) {
invariant(!storageGlobalParams.readOnly);
if (MONGO_FAIL_POINT(exitBeforeDataRepair)) {
log() << "Exiting because 'exitBeforeDataRepair' fail point was set.";
quickExit(EXIT_ABRUPT);
}
// Ensure that the local database is repaired first, if it exists, so that we can open it
// before any other database to be able to determine if this is a replica set node running
// in standalone mode before rebuilding any indexes.
auto dbNamesIt = std::find(dbNames.begin(), dbNames.end(), NamespaceString::kLocalDb);
if (dbNamesIt != dbNames.end()) {
std::swap(dbNames.front(), *dbNamesIt);
invariant(dbNames.front() == NamespaceString::kLocalDb);
}
for (const auto& dbName : dbNames) {
LOG(1) << " Repairing database: " << dbName;
fassertNoTrace(18506, repairDatabase(opCtx, storageEngine, dbName));
}
setReplSetMemberInStandaloneMode(opCtx);
// All collections must have UUIDs before restoring the FCV document to a version that
// requires UUIDs.
uassertStatusOK(ensureCollectionProperties(opCtx, dbNames));
ensuredCollectionProperties = true;
// Attempt to restore the featureCompatibilityVersion document if it is missing.
NamespaceString fcvNSS(NamespaceString::kServerConfigurationNamespace);
auto db = databaseHolder->getDb(opCtx, fcvNSS.db());
Collection* versionColl;
BSONObj featureCompatibilityVersion;
if (!db || !(versionColl = db->getCollection(opCtx, fcvNSS)) ||
!Helpers::findOne(opCtx,
versionColl,
BSON("_id" << FeatureCompatibilityVersionParser::kParameterName),
featureCompatibilityVersion)) {
uassertStatusOK(restoreMissingFeatureCompatibilityVersionDocument(opCtx, dbNames));
}
}
if (!ensuredCollectionProperties) {
uassertStatusOK(ensureCollectionProperties(opCtx, dbNames));
}
if (!storageGlobalParams.readOnly) {
// We open the "local" database before calling hasReplSetConfigDoc() to ensure the in-memory
// catalog entries for the 'kSystemReplSetNamespace' collection have been populated if the
// collection exists. If the "local" database didn't exist at this point yet, then it will
// be created. If the mongod is running in a read-only mode, then it is fine to not open the
// "local" database and populate the catalog entries because we won't attempt to drop the
// temporary collections anyway.
Lock::DBLock dbLock(opCtx, NamespaceString::kSystemReplSetNamespace.db(), MODE_X);
databaseHolder->openDb(opCtx, NamespaceString::kSystemReplSetNamespace.db());
}
if (storageGlobalParams.repair) {
if (MONGO_FAIL_POINT(exitBeforeRepairInvalidatesConfig)) {
log() << "Exiting because 'exitBeforeRepairInvalidatesConfig' fail point was set.";
quickExit(EXIT_ABRUPT);
}
// This must be done after opening the "local" database as it modifies the replica set
// config.
auto repairObserver = StorageRepairObserver::get(opCtx->getServiceContext());
repairObserver->onRepairDone(opCtx);
if (repairObserver->isDataModified()) {
warning() << "Modifications made by repair:";
const auto& mods = repairObserver->getModifications();
for (const auto& mod : mods) {
warning() << " " << mod;
}
if (hasReplSetConfigDoc(opCtx)) {
warning() << "WARNING: Repair may have modified replicated data. This node will no "
"longer be able to join a replica set without a full re-sync";
}
}
}
const repl::ReplSettings& replSettings =
repl::ReplicationCoordinator::get(opCtx)->getSettings();
// On replica set members we only clear temp collections on DBs other than "local" during
// promotion to primary. On pure slaves, they are only cleared when the oplog tells them
// to. The local DB is special because it is not replicated. See SERVER-10927 for more
// details.
const bool shouldClearNonLocalTmpCollections =
!(hasReplSetConfigDoc(opCtx) || replSettings.usingReplSets());
// To check whether a featureCompatibilityVersion document exists.
bool fcvDocumentExists = false;
// To check whether we have databases other than local.
bool nonLocalDatabases = false;
// Refresh list of database names to include newly-created admin, if it exists.
dbNames = storageEngine->listDatabases();
for (const auto& dbName : dbNames) {
if (dbName != "local") {
nonLocalDatabases = true;
}
LOG(1) << " Recovering database: " << dbName;
auto db = databaseHolder->openDb(opCtx, dbName);
invariant(db);
// First thing after opening the database is to check for file compatibility,
// otherwise we might crash if this is a deprecated format.
auto status = storageEngine->currentFilesCompatible(opCtx);
if (!status.isOK()) {
if (status.code() == ErrorCodes::CanRepairToDowngrade) {
// Convert CanRepairToDowngrade statuses to MustUpgrade statuses to avoid logging a
// potentially confusing and inaccurate message.
//
// TODO SERVER-24097: Log a message informing the user that they can start the
// current version of mongod with --repair and then proceed with normal startup.
status = {ErrorCodes::MustUpgrade, status.reason()};
}
severe() << "Unable to start mongod due to an incompatibility with the data files and"
" this version of mongod: "
<< redact(status);
severe() << "Please consult our documentation when trying to downgrade to a previous"
" major release";
quickExit(EXIT_NEED_UPGRADE);
MONGO_UNREACHABLE;
}
// If the server configuration collection already contains a valid
// featureCompatibilityVersion document, cache it in-memory as a server parameter.
if (dbName == "admin") {
if (Collection* versionColl =
db->getCollection(opCtx, NamespaceString::kServerConfigurationNamespace)) {
BSONObj featureCompatibilityVersion;
if (Helpers::findOne(
opCtx,
versionColl,
BSON("_id" << FeatureCompatibilityVersionParser::kParameterName),
featureCompatibilityVersion)) {
auto swVersion =
FeatureCompatibilityVersionParser::parse(featureCompatibilityVersion);
// Note this error path captures all cases of an FCV document existing,
// but with any value other than "4.0" or "4.2". This includes unexpected
// cases with no path forward such as the FCV value not being a string.
uassert(ErrorCodes::MustDowngrade,
str::stream()
<< "UPGRADE PROBLEM: Found an invalid "
"featureCompatibilityVersion document (ERROR: "
<< swVersion.getStatus()
<< "). If the current featureCompatibilityVersion is below "
"4.0, see the documentation on upgrading at "
<< feature_compatibility_version_documentation::kUpgradeLink
<< ".",
swVersion.isOK());
fcvDocumentExists = true;
auto version = swVersion.getValue();
serverGlobalParams.featureCompatibility.setVersion(version);
FeatureCompatibilityVersion::updateMinWireVersion();
// On startup, if the version is in an upgrading or downrading state, print a
// warning.
if (version ==
ServerGlobalParams::FeatureCompatibility::Version::kUpgradingTo42) {
log() << "** WARNING: A featureCompatibilityVersion upgrade did not "
<< "complete. " << startupWarningsLog;
log() << "** The current featureCompatibilityVersion is "
<< FeatureCompatibilityVersionParser::toString(version) << "."
<< startupWarningsLog;
log() << "** To fix this, use the setFeatureCompatibilityVersion "
<< "command to resume upgrade to 4.2." << startupWarningsLog;
} else if (version == ServerGlobalParams::FeatureCompatibility::Version::
kDowngradingTo40) {
log() << "** WARNING: A featureCompatibilityVersion downgrade did not "
<< "complete. " << startupWarningsLog;
log() << "** The current featureCompatibilityVersion is "
<< FeatureCompatibilityVersionParser::toString(version) << "."
<< startupWarningsLog;
log() << "** To fix this, use the setFeatureCompatibilityVersion "
<< "command to resume downgrade to 4.0." << startupWarningsLog;
}
}
}
}
if (replSettings.usingReplSets()) {
// We only care about _id indexes and drop-pending collections if we are in a replset.
db->checkForIdIndexesAndDropPendingCollections(opCtx);
// Ensure oplog is capped (mongodb does not guarantee order of inserts on noncapped
// collections)
if (db->name() == "local") {
checkForCappedOplog(opCtx, db);
}
}
if (!storageGlobalParams.readOnly &&
(shouldClearNonLocalTmpCollections || dbName == "local")) {
db->clearTmpCollections(opCtx);
}
}
// Fail to start up if there is no featureCompatibilityVersion document and there are non-local
// databases present.
if (!fcvDocumentExists && nonLocalDatabases) {
severe()
<< "Unable to start up mongod due to missing featureCompatibilityVersion document.";
severe() << "Please run with --repair to restore the document.";
fassertFailedNoTrace(40652);
}
LOG(1) << "done repairDatabases";
return nonLocalDatabases;
}
} // namespace mongo
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