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/**
* Copyright (C) 2018-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_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/client.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/logv2/log.h"
#include "mongo/util/decorable.h"
namespace mongo {
namespace repl {
const Client::Decoration<ReplClientInfo> ReplClientInfo::forClient =
Client::declareDecoration<ReplClientInfo>();
namespace {
// We use a struct to wrap lastOpSetExplicitly here in order to give the boolean a default value
// when initially constructed for the associated OperationContext.
struct LastOpInfo {
bool lastOpSetExplicitly = false;
};
static const OperationContext::Decoration<LastOpInfo> lastOpInfo =
OperationContext::declareDecoration<LastOpInfo>();
} // namespace
bool ReplClientInfo::lastOpWasSetExplicitlyByClientForCurrentOperation(
OperationContext* opCtx) const {
return lastOpInfo(opCtx).lastOpSetExplicitly;
}
void ReplClientInfo::setLastOp(OperationContext* opCtx, const OpTime& ot) {
invariant(ot >= _lastOp);
_lastOp = ot;
lastOpInfo(opCtx).lastOpSetExplicitly = true;
}
void ReplClientInfo::setLastOpToSystemLastOpTime(OperationContext* opCtx) {
auto replCoord = repl::ReplicationCoordinator::get(opCtx->getServiceContext());
if (replCoord->isReplEnabled() && opCtx->writesAreReplicated()) {
OpTime systemOpTime;
auto status = [&] {
try {
// Get the latest OpTime from oplog.
systemOpTime = replCoord->getLatestWriteOpTime(opCtx);
return Status::OK();
} catch (const DBException& e) {
// Fall back to use my lastAppliedOpTime if we failed to get the latest OpTime from
// storage. In most cases, it is safe to ignore errors because if
// getLatestWriteOpTime throws, we cannot use the same opCtx to wait for
// writeConcern anyways. But getLastError from the same client could use a different
// opCtx to wait for the lastOp. So this is a best effort attempt to set the lastOp
// to the in-memory lastAppliedOpTime (which could be lagged). And this is a known
// bug in getLastError.
systemOpTime = replCoord->getMyLastAppliedOpTime();
if (e.toStatus() == ErrorCodes::OplogOperationUnsupported ||
e.toStatus() == ErrorCodes::NamespaceNotFound ||
e.toStatus() == ErrorCodes::CollectionIsEmpty ||
ErrorCodes::isNotMasterError(e.toStatus())) {
// It is ok if the storage engine does not support getLatestOplogTimestamp() or
// if the oplog is empty. If the node stepped down in between, it is correct to
// use lastAppliedOpTime as last OpTime.
return Status::OK();
}
return e.toStatus();
}
}();
// If the system optime has gone backwards, that must mean that there was a rollback.
// This is safe, but the last op for a Client should never go backwards, so just leave
// the last op for this Client as it was.
if (systemOpTime >= _lastOp) {
_lastOp = systemOpTime;
} else {
LOGV2(21280,
"Not setting the last OpTime for this Client from {lastOp} to the current system "
"time of {systemOpTime} as that would be moving the OpTime backwards. This "
"should only happen if "
"there was a rollback recently",
"lastOp"_attr = _lastOp,
"systemOpTime"_attr = systemOpTime);
}
lastOpInfo(opCtx).lastOpSetExplicitly = true;
// Throw if getLatestWriteOpTime failed.
uassertStatusOK(status);
}
}
void ReplClientInfo::setLastOpToSystemLastOpTimeIgnoringInterrupt(OperationContext* opCtx) {
try {
repl::ReplClientInfo::forClient(opCtx->getClient()).setLastOpToSystemLastOpTime(opCtx);
} catch (const ExceptionForCat<ErrorCategory::Interruption>& e) {
// In most cases, it is safe to ignore interruption errors because we cannot use the same
// OperationContext to wait for writeConcern anyways.
LOGV2_DEBUG(21281,
2,
"Ignoring set last op interruption error: {e_toStatus}",
"e_toStatus"_attr = e.toStatus());
}
}
} // namespace repl
} // namespace mongo
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