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Diffstat (limited to 'src/mongo/s/client/hedging_metrics.h')
-rw-r--r-- | src/mongo/s/client/hedging_metrics.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/mongo/s/client/hedging_metrics.h b/src/mongo/s/client/hedging_metrics.h new file mode 100644 index 00000000000..fae226f342a --- /dev/null +++ b/src/mongo/s/client/hedging_metrics.h @@ -0,0 +1,73 @@ +/** + * Copyright (C) 2020-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. + */ + +#pragma once + +#include "mongo/db/operation_context.h" +#include "mongo/db/service_context.h" + +namespace mongo { + +/** + * Container for server-wide hedging metrics. + */ +class HedgingMetrics { + HedgingMetrics(const HedgingMetrics&) = delete; + HedgingMetrics& operator=(const HedgingMetrics&) = delete; + +public: + HedgingMetrics() = default; + + static HedgingMetrics* get(ServiceContext* service); + static HedgingMetrics* get(OperationContext* opCtx); + + long long getNumTotalOperations() const; + void incrementNumTotalOperations(); + + long long getNumTotalHedgedOperations() const; + void incrementNumTotalHedgedOperations(); + + long long getNumAdvantageouslyHedgedOperations() const; + void incrementNumAdvantageouslyHedgedOperations(); + + BSONObj toBSON() const; + +private: + // The number of all operations with readPreference options such that they could be hedged. + AtomicWord<long long> _numTotalOperations{0}; + + // The number of all operations that actually dispatched an additional rpc. + AtomicWord<long long> _numTotalHedgedOperations{0}; + + // The number of all operations where a rpc other than the first one fulfilled the client + // request. + AtomicWord<long long> _numAdvantageouslyHedgedOperations{0}; +}; + +} // namespace mongo |