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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.
*/
#pragma once
#include "mongo/platform/atomic_word.h"
namespace mongo {
class BSONObjBuilder;
class OperationContext;
class ServiceContext;
/**
* Encapsulates per-process statistics for the sharding subsystem.
*/
struct ShardingStatistics {
// Counts how many times threads hit stale config exception (which is what triggers metadata
// refreshes).
AtomicWord<long long> countStaleConfigErrors{0};
// Cumulative, always-increasing counter of how many chunks this node has started to donate
// (whether they succeeded or not).
AtomicWord<long long> countDonorMoveChunkStarted{0};
// Cumulative, always-increasing counter of how much time the entire move chunk operation took
// (excluding range deletion).
AtomicWord<long long> totalDonorMoveChunkTimeMillis{0};
// Cumulative, always-increasing counter of how much time the clone phase took on the donor
// node, before it was appropriate to enter the critical section.
AtomicWord<long long> totalDonorChunkCloneTimeMillis{0};
// Cumulative, always-increasing counter of how many documents have been cloned on the
// recipient node.
AtomicWord<long long> countDocsClonedOnRecipient{0};
// Cumulative, always-increasing counter of how many documents have been cloned on the donor
// node.
AtomicWord<long long> countDocsClonedOnDonor{0};
// Cumulative, always-increasing counter of how many documents have been deleted on the donor
// node by the rangeDeleter.
AtomicWord<long long> countDocsDeletedOnDonor{0};
// Cumulative, always-increasing counter of how many chunks this node started to receive
// (whether the receiving succeeded or not)
AtomicWord<long long> countRecipientMoveChunkStarted{0};
// Cumulative, always-increasing counter of how much time the critical section's commit phase
// took (this is the period of time when all operations on the collection are blocked, not just
// the reads)
AtomicWord<long long> totalCriticalSectionCommitTimeMillis{0};
// Cumulative, always-increasing counter of how much time the entire critical section took. It
// includes the time the recipient took to fetch the latest modifications from the donor and
// persist them plus the critical section commit time.
//
// The value of totalCriticalSectionTimeMillis - totalCriticalSectionCommitTimeMillis gives the
// duration of the catch-up phase of the critical section (where the last mods are transferred
// from the donor to the recipient).
AtomicWord<long long> totalCriticalSectionTimeMillis{0};
// Cumulative, always-increasing counter of the number of migrations aborted on this node
// after timing out waiting to acquire a lock.
AtomicWord<long long> countDonorMoveChunkLockTimeout{0};
// Cumulative, always-increasing counter of how much time the migration recipient critical
// section took (this is the period of time when write operations on the collection on the
// recipient are blocked).
AtomicWord<long long> totalRecipientCriticalSectionTimeMillis{0};
// Cumulative, always-increasing counter of the number of migrations aborted on this node
// due to concurrent index operations.
AtomicWord<long long> countDonorMoveChunkAbortConflictingIndexOperation{0};
// Total number of migrations leftover from previous primaries that needs to be run to
// completion. Valid only when this process is the repl set primary.
AtomicWord<long long> unfinishedMigrationFromPreviousPrimary{0};
// Current number for chunkMigrationConcurrency that defines concurrent fetchers and inserters
// used for _migrateClone(step 4) of chunk migration
AtomicWord<int> chunkMigrationConcurrencyCnt{1};
/**
* Obtains the per-process instance of the sharding statistics object.
*/
static ShardingStatistics& get(ServiceContext* serviceContext);
static ShardingStatistics& get(OperationContext* opCtx);
/**
* Reports the accumulated statistics for serverStatus.
*/
void report(BSONObjBuilder* builder) const;
};
} // namespace mongo
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