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/**
* Copyright (C) 2022-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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/s/config/configsvr_coordinator.h"
#include "mongo/db/s/config/configsvr_coordinator_gen.h"
#include "mongo/logv2/log.h"
#include "mongo/util/future_util.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
MONGO_FAIL_POINT_DEFINE(hangBeforeRunningConfigsvrCoordinatorInstance);
MONGO_FAIL_POINT_DEFINE(hangAndEndBeforeRunningConfigsvrCoordinatorInstance);
namespace {
const Backoff kExponentialBackoff(Seconds(1), Milliseconds::max());
} // namespace
ConfigsvrCoordinatorMetadata extractConfigsvrCoordinatorMetadata(const BSONObj& stateDoc) {
return ConfigsvrCoordinatorMetadata::parse(IDLParserContext("ConfigsvrCoordinatorMetadata"),
stateDoc);
}
ConfigsvrCoordinator::ConfigsvrCoordinator(const BSONObj& stateDoc)
: _coordId(extractConfigsvrCoordinatorMetadata(stateDoc).getId()) {}
ConfigsvrCoordinator::~ConfigsvrCoordinator() {
invariant(_completionPromise.getFuture().isReady());
}
void ConfigsvrCoordinator::_removeStateDocument(OperationContext* opCtx) {
LOGV2_DEBUG(6347304,
2,
"Removing state document for ConfigsvrCoordinator instance",
"coordId"_attr = _coordId);
PersistentTaskStore<ConfigsvrCoordinatorMetadata> store(
NamespaceString::kConfigsvrCoordinatorsNamespace);
store.remove(opCtx,
BSON(ConfigsvrCoordinatorMetadata::kIdFieldName << _coordId.toBSON()),
WriteConcerns::kMajorityWriteConcernNoTimeout);
}
OperationSessionInfo ConfigsvrCoordinator::_getCurrentSession() const {
const auto& coordinatorMetadata = metadata();
invariant(coordinatorMetadata.getSession());
ConfigsvrCoordinatorSession coordinatorSession = *coordinatorMetadata.getSession();
OperationSessionInfo osi;
osi.setSessionId(coordinatorSession.getLsid());
osi.setTxnNumber(coordinatorSession.getTxnNumber());
return osi;
}
void ConfigsvrCoordinator::interrupt(Status status) noexcept {
LOGV2_DEBUG(6347303,
1,
"ConfigsvrCoordinator received an interrupt",
"coordinatorId"_attr = _coordId,
"reason"_attr = redact(status));
// Resolve any unresolved promises to avoid hanging.
stdx::lock_guard<Latch> lg(_mutex);
if (!_completionPromise.getFuture().isReady()) {
_completionPromise.setError(status);
}
}
SemiFuture<void> ConfigsvrCoordinator::run(std::shared_ptr<executor::ScopedTaskExecutor> executor,
const CancellationToken& token) noexcept {
if (hangAndEndBeforeRunningConfigsvrCoordinatorInstance.shouldFail()) {
hangAndEndBeforeRunningConfigsvrCoordinatorInstance.pauseWhileSet();
return Status::OK();
}
return ExecutorFuture<void>(**executor)
.then([this, executor, token, anchor = shared_from_this()] {
hangBeforeRunningConfigsvrCoordinatorInstance.pauseWhileSet();
return AsyncTry([this, executor, token] { return _runImpl(executor, token); })
.until([this, token](Status status) { return status.isOK() || token.isCanceled(); })
.withBackoffBetweenIterations(kExponentialBackoff)
.on(**executor, CancellationToken::uncancelable());
})
.onCompletion([this, executor, token, anchor = shared_from_this()](const Status& status) {
if (!status.isOK()) {
LOGV2_ERROR(
6347301, "Error executing ConfigsvrCoordinator", "error"_attr = redact(status));
// Nothing else to do, the _completionPromise will be cancelled once the coordinator
// is interrupted, because the only reasons to stop forward progress in this node is
// because of a stepdown happened or the coordinator was canceled.
dassert((token.isCanceled() && status.isA<ErrorCategory::CancellationError>()) ||
status.isA<ErrorCategory::NotPrimaryError>());
return status;
}
try {
auto opCtxHolder = cc().makeOperationContext();
auto* opCtx = opCtxHolder.get();
_removeStateDocument(opCtx);
const auto session = metadata().getSession();
if (session && status.isOK()) {
// Return lsid to the InternalSessionPool. If status is not OK, let the session
// be discarded.
InternalSessionPool::get(opCtx)->release(
{session->getLsid(), session->getTxnNumber()});
}
} catch (DBException& ex) {
LOGV2_WARNING(6347302,
"Failed to remove ConfigsvrCoordinator state document",
"error"_attr = redact(ex));
ex.addContext("Failed to remove ConfigsvrCoordinator state document"_sd);
stdx::lock_guard<Latch> lg(_mutex);
if (!_completionPromise.getFuture().isReady()) {
_completionPromise.setError(ex.toStatus());
}
throw;
}
stdx::lock_guard<Latch> lg(_mutex);
if (!_completionPromise.getFuture().isReady()) {
_completionPromise.emplaceValue();
}
return status;
})
.semi();
}
} // namespace mongo
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