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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::kStorage
#include "mongo/platform/basic.h"
#include <string>
#include <boost/filesystem/operations.hpp>
#include "mongo/db/storage/storage_util.h"
#include "mongo/db/catalog/collection_catalog.h"
#include "mongo/db/storage/durable_catalog.h"
#include "mongo/db/storage/ident.h"
#include "mongo/db/storage/kv/kv_engine.h"
#include "mongo/db/storage/storage_engine.h"
#include "mongo/logv2/log.h"
namespace mongo {
namespace catalog {
void removeIndex(OperationContext* opCtx,
StringData indexName,
RecordId collectionCatalogId,
UUID collectionUUID,
const NamespaceString& nss,
std::shared_ptr<Ident> ident) {
auto durableCatalog = DurableCatalog::get(opCtx);
// If a nullptr was passed in for 'ident', then there is no in-memory state. In that case,
// create an otherwise unreferenced Ident for the ident reaper to use: the reaper will not need
// to wait for existing users to finish.
if (!ident) {
ident = std::make_shared<Ident>(
durableCatalog->getIndexIdent(opCtx, collectionCatalogId, indexName));
}
// Run the first phase of drop to remove the catalog entry.
durableCatalog->removeIndex(opCtx, collectionCatalogId, indexName);
// The OperationContext may not be valid when the RecoveryUnit executes the onCommit handlers.
// Therefore, anything that would normally be fetched from the opCtx must be passed in
// separately to the onCommit handler below.
//
// Index creation (and deletion) are allowed in multi-document transactions that use the same
// RecoveryUnit throughout but not the same OperationContext.
auto recoveryUnit = opCtx->recoveryUnit();
auto storageEngine = opCtx->getServiceContext()->getStorageEngine();
// Schedule the second phase of drop to delete the data when it is no longer in use, if the
// first phase is successuflly committed.
opCtx->recoveryUnit()->onCommit([opCtx,
recoveryUnit,
storageEngine,
collectionUUID,
nss,
indexNameStr = indexName.toString(),
ident](boost::optional<Timestamp> commitTimestamp) {
if (storageEngine->supportsPendingDrops() && commitTimestamp) {
LOGV2(22206,
"Deferring table drop for index '{index}' on collection "
"'{namespace}{uuid}. Ident: '{ident}', commit timestamp: '{commitTimestamp}'",
"Deferring table drop for index",
"index"_attr = indexNameStr,
logAttrs(nss),
"uuid"_attr = collectionUUID,
"ident"_attr = ident->getIdent(),
"commitTimestamp"_attr = commitTimestamp);
storageEngine->addDropPendingIdent(*commitTimestamp, nss, ident);
} else {
auto kvEngine = storageEngine->getEngine();
kvEngine->dropIdent(recoveryUnit, ident->getIdent()).ignore();
}
});
}
Status dropCollection(OperationContext* opCtx,
const NamespaceString& nss,
RecordId collectionCatalogId,
std::shared_ptr<Ident> ident) {
invariant(ident);
// Run the first phase of drop to remove the catalog entry.
Status status = DurableCatalog::get(opCtx)->dropCollection(opCtx, collectionCatalogId);
if (!status.isOK()) {
return status;
}
// The OperationContext may not be valid when the RecoveryUnit executes the onCommit handlers.
// Therefore, anything that would normally be fetched from the opCtx must be passed in
// separately to the onCommit handler below.
//
// Create (and drop) collection are allowed in multi-document transactions that use the same
// RecoveryUnit throughout but not the same OperationContext.
auto recoveryUnit = opCtx->recoveryUnit();
auto storageEngine = opCtx->getServiceContext()->getStorageEngine();
const auto& collectionCatalog = CollectionCatalog::get(opCtx);
// Schedule the second phase of drop to delete the data when it is no longer in use, if the
// first phase is successuflly committed.
opCtx->recoveryUnit()->onCommit([recoveryUnit, storageEngine, &collectionCatalog, nss, ident](
boost::optional<Timestamp> commitTimestamp) {
StorageEngine::DropIdentCallback onDrop = [storageEngine,
&collectionCatalog](const NamespaceString& ns) {
// Nothing to do if not using directoryperdb or there are still collections in the
// database.
if (!storageEngine->isUsingDirectoryPerDb() ||
collectionCatalog.begin(nullptr, ns.db()) != collectionCatalog.end(nullptr)) {
return;
}
boost::system::error_code ec;
boost::filesystem::remove(storageEngine->getFilesystemPathForDb(ns.db().toString()),
ec);
if (!ec) {
LOGV2(4888200, "Removed empty database directory", "db"_attr = ns.db());
} else if (collectionCatalog.begin(nullptr, ns.db()) ==
collectionCatalog.end(nullptr)) {
// It is possible for a new collection to be created in the database between
// when we check whether the database is empty and actually attempting to
// remove the directory. In this case, don't log that the removal failed
// because it is expected.
LOGV2(4888201,
"Failed to remove database directory",
"db"_attr = ns.db(),
"error"_attr = ec.message());
}
};
if (storageEngine->supportsPendingDrops() && commitTimestamp) {
LOGV2(22214,
"Deferring table drop for collection",
logAttrs(nss),
"ident"_attr = ident->getIdent(),
"commitTimestamp"_attr = commitTimestamp);
storageEngine->addDropPendingIdent(*commitTimestamp, nss, ident, onDrop);
} else {
// Intentionally ignoring failure here. Since we've removed the metadata pointing to
// the collection, we should never see it again anyway.
storageEngine->getEngine()->dropIdent(recoveryUnit, ident->getIdent()).ignore();
onDrop(nss);
}
});
return Status::OK();
}
} // namespace catalog
} // namespace mongo
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