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/**
* Copyright (C) 2014 MongoDB 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::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/repl/minvalid.h"
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/dbhelpers.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/operation_context_impl.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
namespace mongo {
namespace repl {
namespace {
const char initialSyncFlagString[] = "doingInitialSync";
const BSONObj initialSyncFlag(BSON(initialSyncFlagString << true));
const char minvalidNS[] = "local.replset.minvalid";
const char beginFieldName[] = "begin";
} // namespace
// Writes
void clearInitialSyncFlag(OperationContext* txn) {
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
ScopedTransaction transaction(txn, MODE_IX);
// TODO: Investigate correctness of taking MODE_IX for DB/Collection locks
Lock::DBLock dblk(txn->lockState(), "local", MODE_X);
Helpers::putSingleton(txn, minvalidNS, BSON("$unset" << initialSyncFlag));
}
MONGO_WRITE_CONFLICT_RETRY_LOOP_END(txn, "clearInitialSyncFlags", minvalidNS);
auto replCoord = repl::ReplicationCoordinator::get(txn);
OpTime time = replCoord->getMyLastAppliedOpTime();
txn->recoveryUnit()->waitUntilDurable();
replCoord->setMyLastDurableOpTime(time);
LOG(3) << "clearing initial sync flag";
}
void setInitialSyncFlag(OperationContext* txn) {
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock dblk(txn->lockState(), "local", MODE_X);
Helpers::putSingleton(txn, minvalidNS, BSON("$set" << initialSyncFlag));
}
MONGO_WRITE_CONFLICT_RETRY_LOOP_END(txn, "setInitialSyncFlags", minvalidNS);
txn->recoveryUnit()->waitUntilDurable();
LOG(3) << "setting initial sync flag";
}
void setMinValid(OperationContext* txn, const OpTime& endOpTime, const DurableRequirement durReq) {
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock dblk(txn->lockState(), "local", MODE_X);
Helpers::putSingleton(
txn,
minvalidNS,
BSON("$set" << BSON("ts" << endOpTime.getTimestamp() << "t" << endOpTime.getTerm())
<< "$unset" << BSON(beginFieldName << 1)));
}
MONGO_WRITE_CONFLICT_RETRY_LOOP_END(txn, "setMinValid", minvalidNS);
if (durReq == DurableRequirement::Strong) {
txn->recoveryUnit()->waitUntilDurable();
}
LOG(3) << "setting minvalid: " << endOpTime.toString() << "(" << endOpTime.toBSON() << ")";
}
void setMinValid(OperationContext* txn, const BatchBoundaries& boundaries) {
const OpTime& start(boundaries.start);
const OpTime& end(boundaries.end);
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock dblk(txn->lockState(), "local", MODE_X);
Helpers::putSingleton(txn,
minvalidNS,
BSON("$set" << BSON("ts" << end.getTimestamp() << "t" << end.getTerm()
<< beginFieldName << start.toBSON())));
}
MONGO_WRITE_CONFLICT_RETRY_LOOP_END(txn, "setMinValid", minvalidNS);
// NOTE: No need to ensure durability here since starting a batch isn't a problem unless
// writes happen after, in which case this marker (minvalid) will be written already.
LOG(3) << "setting minvalid: " << boundaries.start.toString() << "("
<< boundaries.start.toBSON() << ") -> " << boundaries.end.toString() << "("
<< boundaries.end.toBSON() << ")";
}
// Reads
bool getInitialSyncFlag() {
OperationContextImpl txn;
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
ScopedTransaction transaction(&txn, MODE_IS);
Lock::DBLock dblk(txn.lockState(), "local", MODE_IS);
Lock::CollectionLock lk(txn.lockState(), minvalidNS, MODE_IS);
BSONObj mv;
bool found = Helpers::getSingleton(&txn, minvalidNS, mv);
if (found) {
const auto flag = mv[initialSyncFlagString].trueValue();
LOG(3) << "return initial flag value of " << flag;
return flag;
}
LOG(3) << "return initial flag value of false";
return false;
}
MONGO_WRITE_CONFLICT_RETRY_LOOP_END(&txn, "getInitialSyncFlags", minvalidNS);
MONGO_UNREACHABLE;
}
BatchBoundaries getMinValid(OperationContext* txn) {
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
ScopedTransaction transaction(txn, MODE_IS);
Lock::DBLock dblk(txn->lockState(), "local", MODE_IS);
Lock::CollectionLock lk(txn->lockState(), minvalidNS, MODE_IS);
BSONObj mv;
bool found = Helpers::getSingleton(txn, minvalidNS, mv);
if (found) {
auto status = OpTime::parseFromOplogEntry(mv.getObjectField(beginFieldName));
OpTime start(status.isOK() ? status.getValue() : OpTime{});
OpTime end(fassertStatusOK(28771, OpTime::parseFromOplogEntry(mv)));
LOG(3) << "returning minvalid: " << start.toString() << "(" << start.toBSON() << ") -> "
<< end.toString() << "(" << end.toBSON() << ")";
return BatchBoundaries(start, end);
}
LOG(3) << "returning empty minvalid";
return BatchBoundaries{OpTime{}, OpTime{}};
}
MONGO_WRITE_CONFLICT_RETRY_LOOP_END(txn, "getMinValid", minvalidNS);
}
}
}
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