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// drop_indexes.cpp
/**
* Copyright (C) 2013 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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::kCommand
#include "mongo/platform/basic.h"
#include <string>
#include <vector>
#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/drop_indexes.h"
#include "mongo/db/catalog/index_catalog.h"
#include "mongo/db/catalog/index_create.h"
#include "mongo/db/catalog/index_key_validate.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/curop.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/index_builder.h"
#include "mongo/db/op_observer.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/db/service_context.h"
#include "mongo/util/log.h"
namespace mongo {
using std::endl;
using std::string;
using std::stringstream;
using std::vector;
/* "dropIndexes" is now the preferred form - "deleteIndexes" deprecated */
class CmdDropIndexes : public Command {
public:
virtual bool slaveOk() const {
return false;
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return true;
}
virtual void help(stringstream& help) const {
help << "drop indexes for a collection";
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::dropIndex);
out->push_back(Privilege(parseResourcePattern(dbname, cmdObj), actions));
}
CmdDropIndexes() : Command("dropIndexes", false, "deleteIndexes") {}
bool run(OperationContext* txn,
const string& dbname,
BSONObj& jsobj,
int,
string& errmsg,
BSONObjBuilder& result) {
const NamespaceString nss = parseNsCollectionRequired(dbname, jsobj);
return appendCommandStatus(result, dropIndexes(txn, nss, jsobj, &result));
}
} cmdDropIndexes;
class CmdReIndex : public Command {
public:
virtual bool slaveOk() const {
return true;
} // can reindex on a secondary
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return true;
}
virtual void help(stringstream& help) const {
help << "re-index a collection";
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::reIndex);
out->push_back(Privilege(parseResourcePattern(dbname, cmdObj), actions));
}
CmdReIndex() : Command("reIndex") {}
bool run(OperationContext* txn,
const string& dbname,
BSONObj& jsobj,
int,
string& errmsg,
BSONObjBuilder& result) {
DBDirectClient db(txn);
const NamespaceString toReIndexNs = parseNsCollectionRequired(dbname, jsobj);
LOG(0) << "CMD: reIndex " << toReIndexNs;
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock dbXLock(txn->lockState(), dbname, MODE_X);
OldClientContext ctx(txn, toReIndexNs.ns());
Collection* collection = ctx.db()->getCollection(toReIndexNs.ns());
if (!collection) {
if (ctx.db()->getViewCatalog()->lookup(txn, toReIndexNs.ns()))
return appendCommandStatus(
result, {ErrorCodes::CommandNotSupportedOnView, "can't re-index a view"});
else
return appendCommandStatus(
result, {ErrorCodes::NamespaceNotFound, "collection does not exist"});
}
BackgroundOperation::assertNoBgOpInProgForNs(toReIndexNs.ns());
const auto featureCompatibilityVersion =
serverGlobalParams.featureCompatibilityVersion.load();
const auto defaultIndexVersion =
IndexDescriptor::getDefaultIndexVersion(featureCompatibilityVersion);
vector<BSONObj> all;
{
vector<string> indexNames;
collection->getCatalogEntry()->getAllIndexes(txn, &indexNames);
all.reserve(indexNames.size());
for (size_t i = 0; i < indexNames.size(); i++) {
const string& name = indexNames[i];
BSONObj spec = collection->getCatalogEntry()->getIndexSpec(txn, name);
{
BSONObjBuilder bob;
for (auto&& indexSpecElem : spec) {
auto indexSpecElemFieldName = indexSpecElem.fieldNameStringData();
if (IndexDescriptor::kIndexVersionFieldName == indexSpecElemFieldName) {
// We create a new index specification with the 'v' field set as
// 'defaultIndexVersion'.
bob.append(IndexDescriptor::kIndexVersionFieldName,
static_cast<int>(defaultIndexVersion));
} else {
bob.append(indexSpecElem);
}
}
all.push_back(bob.obj());
}
const BSONObj key = spec.getObjectField("key");
const Status keyStatus = validateKeyPattern(key);
if (!keyStatus.isOK()) {
errmsg = str::stream()
<< "Cannot rebuild index " << spec << ": " << keyStatus.reason()
<< " For more info see http://dochub.mongodb.org/core/index-validation";
return false;
}
}
}
result.appendNumber("nIndexesWas", all.size());
{
WriteUnitOfWork wunit(txn);
Status s = collection->getIndexCatalog()->dropAllIndexes(txn, true);
if (!s.isOK()) {
errmsg = "dropIndexes failed";
return appendCommandStatus(result, s);
}
wunit.commit();
}
MultiIndexBlock indexer(txn, collection);
// do not want interruption as that will leave us without indexes.
auto indexInfoObjs = indexer.init(all);
if (!indexInfoObjs.isOK()) {
return appendCommandStatus(result, indexInfoObjs.getStatus());
}
auto status = indexer.insertAllDocumentsInCollection();
if (!status.isOK()) {
return appendCommandStatus(result, status);
}
{
WriteUnitOfWork wunit(txn);
indexer.commit();
wunit.commit();
}
// Do not allow majority reads from this collection until all original indexes are visible.
// This was also done when dropAllIndexes() committed, but we need to ensure that no one
// tries to read in the intermediate state where all indexes are newer than the current
// snapshot so are unable to be used.
auto replCoord = repl::ReplicationCoordinator::get(txn);
auto snapshotName = replCoord->reserveSnapshotName(txn);
replCoord->forceSnapshotCreation(); // Ensures a newer snapshot gets created even if idle.
collection->setMinimumVisibleSnapshot(snapshotName);
result.append("nIndexes", static_cast<int>(indexInfoObjs.getValue().size()));
result.append("indexes", indexInfoObjs.getValue());
return true;
}
} cmdReIndex;
}
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