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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/db/s/resharding/resharding_metrics_helpers.h"
#include "mongo/db/catalog_raii.h"
#include "mongo/db/s/collection_sharding_runtime.h"
#include "mongo/db/s/resharding/resharding_donor_recipient_common.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kResharding
namespace mongo {
namespace resharding_metrics {
namespace {
boost::optional<UUID> tryGetReshardingUUID(OperationContext* opCtx, const NamespaceString& nss) {
// We intentionally use AutoGetDb and acquire the collection lock manually here instead of using
// AutoGetCollection. AutoGetCollection will call checkShardVersionOrThrow() to verify that the
// shard version on the opCtx is compatible with the shard version on the collection, however
// this verification will throw if the critical section is held. Since the critical section is
// always held on this code path by definition, this check must be bypassed. As a consequence,
// if the metadata is not known (because this is a secondary that stepped up during the critical
// section), the metrics will not be incremented. The resharding metrics already do not attempt
// to restore the number of reads/writes done on a previous primary during a critical section,
// so this is considered acceptable.
AutoGetDb autoDb(opCtx, nss.dbName(), MODE_IS);
Lock::CollectionLock collLock(opCtx, nss, MODE_IS);
auto csr = CollectionShardingRuntime::get(opCtx, nss);
auto metadata = csr->getCurrentMetadataIfKnown();
if (!metadata || !metadata->isSharded()) {
return boost::none;
}
const auto& reshardingFields = metadata->getReshardingFields();
if (!reshardingFields) {
return boost::none;
}
return reshardingFields->getReshardingUUID();
}
void onCriticalSectionErrorThrows(OperationContext* opCtx, const StaleConfigInfo& info) {
const auto& operationType = info.getDuringOperationType();
if (!operationType) {
return;
}
auto reshardingId = tryGetReshardingUUID(opCtx, info.getNss());
if (!reshardingId) {
return;
}
auto stateMachine =
resharding::tryGetReshardingStateMachine<ReshardingDonorService,
ReshardingDonorService::DonorStateMachine,
ReshardingDonorDocument>(opCtx, *reshardingId);
if (!stateMachine) {
return;
}
switch (*operationType) {
case StaleConfigInfo::OperationType::kWrite:
(*stateMachine)->onWriteDuringCriticalSection();
return;
case StaleConfigInfo::OperationType::kRead:
(*stateMachine)->onReadDuringCriticalSection();
return;
}
}
} // namespace
void onCriticalSectionError(OperationContext* opCtx, const StaleConfigInfo& info) noexcept {
try {
onCriticalSectionErrorThrows(opCtx, info);
} catch (const DBException& e) {
LOGV2(6437201,
"Unable to record resharding critical section metrics for the current operation",
"reason"_attr = redact(e.toStatus()));
}
}
} // namespace resharding_metrics
} // namespace mongo
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