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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 <algorithm>
#include "mongo/db/repair_database.h"
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/bson/bson_validate.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/background.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/collection_catalog_entry.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/catalog/document_validation.h"
#include "mongo/db/catalog/index_key_validate.h"
#include "mongo/db/catalog/multi_index_block.h"
#include "mongo/db/catalog/namespace_uuid_cache.h"
#include "mongo/db/catalog/uuid_catalog.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/index_builds_coordinator.h"
#include "mongo/db/logical_clock.h"
#include "mongo/db/query/query_knobs_gen.h"
#include "mongo/db/storage/storage_engine.h"
#include "mongo/util/log.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
StatusWith<IndexNameObjs> getIndexNameObjs(OperationContext* opCtx,
CollectionCatalogEntry* cce,
stdx::function<bool(const std::string&)> filter) {
IndexNameObjs ret;
std::vector<std::string>& indexNames = ret.first;
std::vector<BSONObj>& indexSpecs = ret.second;
{
// Fetch all indexes
cce->getAllIndexes(opCtx, &indexNames);
auto newEnd =
std::remove_if(indexNames.begin(),
indexNames.end(),
[&filter](const std::string& indexName) { return !filter(indexName); });
indexNames.erase(newEnd, indexNames.end());
indexSpecs.reserve(indexNames.size());
for (const auto& name : indexNames) {
BSONObj spec = cce->getIndexSpec(opCtx, name);
using IndexVersion = IndexDescriptor::IndexVersion;
IndexVersion indexVersion = IndexVersion::kV1;
if (auto indexVersionElem = spec[IndexDescriptor::kIndexVersionFieldName]) {
auto indexVersionNum = indexVersionElem.numberInt();
invariant(indexVersionNum == static_cast<int>(IndexVersion::kV1) ||
indexVersionNum == static_cast<int>(IndexVersion::kV2));
indexVersion = static_cast<IndexVersion>(indexVersionNum);
}
invariant(spec.isOwned());
indexSpecs.push_back(spec);
const BSONObj key = spec.getObjectField("key");
const Status keyStatus = index_key_validate::validateKeyPattern(key, indexVersion);
if (!keyStatus.isOK()) {
return Status(
ErrorCodes::CannotCreateIndex,
str::stream()
<< "Cannot rebuild index "
<< spec
<< ": "
<< keyStatus.reason()
<< " For more info see http://dochub.mongodb.org/core/index-validation");
}
}
}
return ret;
}
Status rebuildIndexesOnCollection(OperationContext* opCtx,
CollectionCatalogEntry* cce,
const std::vector<BSONObj>& indexSpecs) {
// Skip the rest if there are no indexes to rebuild.
if (indexSpecs.empty())
return Status::OK();
// Rebuild the indexes provided by 'indexSpecs'.
IndexBuildsCoordinator* indexBuildsCoord = IndexBuildsCoordinator::get(opCtx);
UUID buildUUID = UUID::gen();
auto swRebuild =
indexBuildsCoord->startIndexRebuildForRecovery(opCtx, cce, indexSpecs, buildUUID);
if (!swRebuild.isOK()) {
return swRebuild.getStatus();
}
auto[numRecords, dataSize] = swRebuild.getValue();
auto rs = cce->getRecordStore();
// Update the record store stats after finishing and committing the index builds.
WriteUnitOfWork wuow(opCtx);
rs->updateStatsAfterRepair(opCtx, numRecords, dataSize);
wuow.commit();
return Status::OK();
}
namespace {
Status repairCollections(OperationContext* opCtx,
StorageEngine* engine,
const std::string& dbName,
stdx::function<void(const std::string& dbName)> onRecordStoreRepair) {
auto colls = UUIDCatalog::get(opCtx).getAllCollectionNamesFromDb(opCtx, dbName);
for (const auto& nss : colls) {
opCtx->checkForInterrupt();
log() << "Repairing collection " << nss;
Status status = engine->repairRecordStore(opCtx, nss);
if (!status.isOK())
return status;
}
onRecordStoreRepair(dbName);
for (const auto& nss : colls) {
opCtx->checkForInterrupt();
CollectionCatalogEntry* cce =
UUIDCatalog::get(opCtx).lookupCollectionCatalogEntryByNamespace(nss);
auto swIndexNameObjs = getIndexNameObjs(opCtx, cce);
if (!swIndexNameObjs.isOK())
return swIndexNameObjs.getStatus();
std::vector<BSONObj> indexSpecs = swIndexNameObjs.getValue().second;
Status status = rebuildIndexesOnCollection(opCtx, cce, indexSpecs);
if (!status.isOK())
return status;
engine->flushAllFiles(opCtx, true);
}
return Status::OK();
}
} // namespace
Status repairDatabase(OperationContext* opCtx,
StorageEngine* engine,
const std::string& dbName,
stdx::function<void(const std::string& dbName)> onRecordStoreRepair) {
DisableDocumentValidation validationDisabler(opCtx);
// We must hold some form of lock here
invariant(opCtx->lockState()->isW());
invariant(dbName.find('.') == std::string::npos);
log() << "repairDatabase " << dbName;
BackgroundOperation::assertNoBgOpInProgForDb(dbName);
opCtx->checkForInterrupt();
// Close the db and invalidate all current users and caches.
auto databaseHolder = DatabaseHolder::get(opCtx);
databaseHolder->close(opCtx, dbName);
auto status = repairCollections(opCtx, engine, dbName, onRecordStoreRepair);
if (!status.isOK()) {
severe() << "Failed to repair database " << dbName << ": " << status.reason();
}
try {
// Ensure that we don't trigger an exception when attempting to take locks.
UninterruptibleLockGuard noInterrupt(opCtx->lockState());
// Open the db after everything finishes.
auto db = databaseHolder->openDb(opCtx, dbName);
// Set the minimum snapshot for all Collections in this db. This ensures that readers
// using majority readConcern level can only use the collections after their repaired
// versions are in the committed view.
auto clusterTime = LogicalClock::getClusterTimeForReplicaSet(opCtx).asTimestamp();
for (auto collIt = db->begin(opCtx); collIt != db->end(opCtx); ++collIt) {
auto collection = *collIt;
if (collection) {
collection->setMinimumVisibleSnapshot(clusterTime);
}
}
// Restore oplog Collection pointer cache.
repl::acquireOplogCollectionForLogging(opCtx);
} catch (const ExceptionFor<ErrorCodes::MustDowngrade>&) {
// openDb can throw an exception with a MustDowngrade status if a collection does not
// have a UUID.
throw;
} catch (...) {
severe() << "Unexpected exception encountered while reopening database after repair.";
std::terminate(); // Logs additional info about the specific error.
}
return status;
}
} // namespace mongo
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