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/**
* Copyright (C) 2012 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::kIndex
#include "mongo/platform/basic.h"
#include "mongo/db/index_builder.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/client.h"
#include "mongo/db/curop.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/catalog/index_create.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/operation_context_impl.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using std::endl;
AtomicUInt32 IndexBuilder::_indexBuildCount;
namespace {
// Synchronization tools when replication spawns a background index in a new thread.
// The bool is 'true' when a new background index has started in a new thread but the
// parent thread has not yet synchronized with it.
bool _bgIndexStarting(false);
boost::mutex _bgIndexStartingMutex;
boost::condition_variable _bgIndexStartingCondVar;
void _setBgIndexStarting() {
boost::mutex::scoped_lock lk(_bgIndexStartingMutex);
invariant(_bgIndexStarting == false);
_bgIndexStarting = true;
_bgIndexStartingCondVar.notify_one();
}
} // namespace
IndexBuilder::IndexBuilder(const BSONObj& index)
: BackgroundJob(true /* self-delete */),
_index(index.getOwned()),
_name(str::stream() << "repl index builder " << _indexBuildCount.addAndFetch(1)) {}
IndexBuilder::~IndexBuilder() {}
std::string IndexBuilder::name() const {
return _name;
}
void IndexBuilder::run() {
Client::initThread(name().c_str());
LOG(2) << "IndexBuilder building index " << _index;
OperationContextImpl txn;
txn.lockState()->setIsBatchWriter(true);
txn.getClient()->getAuthorizationSession()->grantInternalAuthorization();
txn.getCurOp()->reset(HostAndPort(), dbInsert);
NamespaceString ns(_index["ns"].String());
ScopedTransaction transaction(&txn, MODE_IX);
Lock::DBLock dlk(txn.lockState(), ns.db(), MODE_X);
Client::Context ctx(&txn, ns.getSystemIndexesCollection());
Database* db = dbHolder().get(&txn, ns.db().toString());
Status status = _build(&txn, db, true, &dlk);
if (!status.isOK()) {
error() << "IndexBuilder could not build index: " << status.toString();
fassert(28555, ErrorCodes::isInterruption(status.code()));
}
txn.getClient()->shutdown();
}
Status IndexBuilder::buildInForeground(OperationContext* txn, Database* db) const {
return _build(txn, db, false, NULL);
}
void IndexBuilder::waitForBgIndexStarting() {
boost::unique_lock<boost::mutex> lk(_bgIndexStartingMutex);
while (_bgIndexStarting == false) {
_bgIndexStartingCondVar.wait(lk);
}
// Reset for next time.
_bgIndexStarting = false;
}
Status IndexBuilder::_build(OperationContext* txn,
Database* db,
bool allowBackgroundBuilding,
Lock::DBLock* dbLock) const {
const NamespaceString ns(_index["ns"].String());
Collection* c = db->getCollection(ns.ns());
if (!c) {
while (true) {
try {
WriteUnitOfWork wunit(txn);
c = db->getOrCreateCollection(txn, ns.ns());
verify(c);
wunit.commit();
break;
} catch (const WriteConflictException& wce) {
LOG(2) << "WriteConflictException while creating collection in IndexBuilder"
<< ", retrying.";
txn->recoveryUnit()->commitAndRestart();
continue;
}
}
}
// Show which index we're building in the curop display.
txn->getCurOp()->setQuery(_index);
bool haveSetBgIndexStarting = false;
while (true) {
Status status = Status::OK();
try {
MultiIndexBlock indexer(txn, c);
indexer.allowInterruption();
if (allowBackgroundBuilding)
indexer.allowBackgroundBuilding();
try {
status = indexer.init(_index);
if (status.code() == ErrorCodes::IndexAlreadyExists) {
if (allowBackgroundBuilding) {
// Must set this in case anyone is waiting for this build.
_setBgIndexStarting();
}
return Status::OK();
}
if (status.isOK()) {
if (allowBackgroundBuilding) {
if (!haveSetBgIndexStarting) {
_setBgIndexStarting();
haveSetBgIndexStarting = true;
}
invariant(dbLock);
dbLock->relockWithMode(MODE_IX);
}
Lock::CollectionLock colLock(txn->lockState(), ns.ns(), MODE_IX);
status = indexer.insertAllDocumentsInCollection();
}
if (status.isOK()) {
if (allowBackgroundBuilding) {
dbLock->relockWithMode(MODE_X);
}
WriteUnitOfWork wunit(txn);
indexer.commit();
wunit.commit();
}
} catch (const DBException& e) {
status = e.toStatus();
}
if (allowBackgroundBuilding) {
dbLock->relockWithMode(MODE_X);
Database* reloadDb = dbHolder().get(txn, ns.db());
fassert(28553, reloadDb);
fassert(28554, reloadDb->getCollection(ns.ns()));
}
if (status.code() == ErrorCodes::InterruptedAtShutdown) {
// leave it as-if kill -9 happened. This will be handled on restart.
indexer.abortWithoutCleanup();
}
} catch (const WriteConflictException& wce) {
status = wce.toStatus();
}
if (status.code() != ErrorCodes::WriteConflict)
return status;
LOG(2) << "WriteConflictException while creating index in IndexBuilder, retrying.";
txn->recoveryUnit()->commitAndRestart();
}
}
} // namespace mongo
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