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/**
* Copyright (C) 2018 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/replication_state_transition_lock_guard.h"
#include "mongo/db/kill_sessions_local.h"
#include "mongo/db/session_catalog.h"
#include "mongo/db/session_killer.h"
#include "mongo/db/transaction_participant.h"
namespace mongo {
namespace repl {
ReplicationStateTransitionLockGuard::ReplicationStateTransitionLockGuard(OperationContext* opCtx,
const Args& args)
: _opCtx(opCtx), _args(args) {
// First enqueue the request for the global X lock.
_globalLock.emplace(opCtx,
MODE_X,
args.lockDeadline,
Lock::InterruptBehavior::kThrow,
Lock::GlobalLock::EnqueueOnly());
// Next prevent any Sessions from being created or checked out.
_preventCheckingOutSessions.emplace(SessionCatalog::get(opCtx));
// If we're going to be killing all user operations do it before waiting for the global lock
// and for all Sessions to be checked in as killing all running user ops may make those things
// happen faster.
if (args.killUserOperations) {
ServiceContext* environment = opCtx->getServiceContext();
environment->killAllUserOperations(opCtx, ErrorCodes::InterruptedDueToStepDown);
}
// Now wait for all Sessions to be checked in so we can iterate over all of them and abort
// any in-progress transactions and yield and gather the LockSnapshots for all prepared
// transactions.
_preventCheckingOutSessions->waitForAllSessionsToBeCheckedIn(opCtx);
killSessionsLocalAbortOrYieldAllTransactions(opCtx, &_yieldedLocks);
// Now that all transactions have either aborted or yielded their locks, we can wait for the
// global X lock to be taken successfully.
_globalLock->waitForLockUntil(args.lockDeadline);
uassert(ErrorCodes::ExceededTimeLimit,
"Could not acquire the global lock before the deadline",
_globalLock->isLocked());
}
ReplicationStateTransitionLockGuard::~ReplicationStateTransitionLockGuard() {
invariant(_globalLock->isLocked());
// Restore the locks for the prepared transactions, but put all requests for the global lock
// into a TemporaryResourceQueue for the global resource.
const ResourceId globalResId(RESOURCE_GLOBAL, ResourceId::SINGLETON_GLOBAL);
LockManager::TemporaryResourceQueue tempGlobalResource(globalResId);
for (auto&& pair : _yieldedLocks) {
auto locker = pair.first;
auto lockSnapshot = pair.second;
locker->restoreLockStateWithTemporaryGlobalResource(
_opCtx, lockSnapshot, &tempGlobalResource);
}
// Now atomically release the global X lock and restore the locks on the global resource from
// the TemporaryResourceQueue that was populated with the Global lock requests from the yielded
// locks from prepared transactions.
_opCtx->lockState()->replaceGlobalLockStateWithTemporaryGlobalResource(&tempGlobalResource);
}
void ReplicationStateTransitionLockGuard::releaseGlobalLockForStepdownAttempt() {
invariant(_globalLock->isLocked());
_globalLock.reset();
}
void ReplicationStateTransitionLockGuard::reacquireGlobalLockForStepdownAttempt() {
invariant(!_globalLock);
UninterruptibleLockGuard noInterrupt(_opCtx->lockState());
_globalLock.emplace(_opCtx, MODE_X);
}
} // namespace repl
} // namespace mongo
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