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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 <atomic>
#include <string>
#include "mongo/platform/atomic_proxy.h"
#include "mongo/platform/atomic_word.h"
/*
* This file defines the storage for options that come from the command line related to data file
* persistence. Many executables that can access data files directly such as mongod and certain
* tools use these variables, but each executable may have a different set of command line flags
* that allow the user to change a different subset of these options.
*/
namespace mongo {
struct StorageGlobalParams {
StorageGlobalParams();
void reset();
// Default data directory for mongod when running in non-config server mode.
static const char* kDefaultDbPath;
// Default data directory for mongod when running as the config database of
// a sharded cluster.
static const char* kDefaultConfigDbPath;
// --storageEngine
// storage engine for this instance of mongod.
std::string engine;
// True if --storageEngine was passed on the command line, and false otherwise.
bool engineSetByUser;
// The directory where the mongod instance stores its data.
std::string dbpath;
// --upgrade
// Upgrades the on-disk data format of the files specified by the --dbpath to the
// latest version, if needed.
bool upgrade;
// --repair
// Runs a repair routine on all databases.
bool repair;
// --restore
// This should only be used when restoring from a backup. Mongod will behave differently by
// handling collections with missing data files, allowing database renames, skipping oplog
// entries for collections not restored and more.
bool restore;
// --magicRestore
bool magicRestore;
// Whether the Storage Engine selected should be ephemeral in nature or not.
bool ephemeral = false;
// --journalCommitInterval
// This parameter is both a server parameter and a configuration parameter, and to resolve
// conflicts between the two the default must be set here.
static constexpr int kMaxJournalCommitIntervalMs = 500;
AtomicWord<int> journalCommitIntervalMs{100};
// --notablescan
// no table scans allowed
AtomicWord<bool> noTableScan;
// --directoryperdb
// Stores each database’s files in its own folder in the data directory.
// When applied to an existing system, the directoryPerDB option alters
// the storage pattern of the data directory.
bool directoryperdb;
// --syncdelay
// Delay in seconds between triggering the next checkpoint after the completion of the previous
// one. A value of 0 indicates that checkpointing will be skipped.
// Do not set this value on production systems.
// In almost every situation, you should use the default setting.
// This parameter is both a server parameter and a configuration parameter, and to resolve
// conflicts between the two the default must be set here.
static constexpr double kMaxSyncdelaySecs = 60 * 60; // 1hr
AtomicDouble syncdelay{60.0}; // seconds between checkpoints
// --queryableBackupMode
// Prevents user-originating operations from performing writes to the server. Internally
// generated writes are still permitted.
bool queryableBackupMode;
// --groupCollections
// Dictate to the storage engine that it should attempt to create new MongoDB collections from
// an existing underlying MongoDB database level resource if possible. This can improve
// workloads that rely heavily on creating many collections within a database.
bool groupCollections;
// --oplogMinRetentionHours
// Controls what size the oplog should be in addition to oplogSize. If set, the oplog will only
// be truncated if it is over the capped size, and if the bucket of oldest oplog entries fall
// outside of the retention window which is set by this option.
AtomicWord<double> oplogMinRetentionHours;
// Controls whether we allow the OplogTruncateMarkers mechanism to delete oplog history on WT.
bool allowOplogTruncation;
// Disables lock-free reads. Lock-free reads is incompatible with
// enableMajorityReadConcern=false.
bool disableLockFreeReads = false;
// Test-only option. Disables table logging.
bool forceDisableTableLogging = false;
};
extern StorageGlobalParams storageGlobalParams;
} // namespace mongo
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