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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.
#
global:
cpp_namespace: "mongo"
cpp_includes:
- "mongo/db/storage/wiredtiger/wiredtiger_kv_engine.h"
- "mongo/util/concurrency/ticketholder.h"
- "mongo/util/debug_util.h"
server_parameters:
wiredTigerConcurrentWriteTransactions:
description: "WiredTiger Concurrent Write Transactions"
set_at: [ startup, runtime ]
cpp_class:
name: OpenWriteTransactionParam
data: 'TicketHolder*'
override_ctor: true
wiredTigerConcurrentReadTransactions:
description: "WiredTiger Concurrent Read Transactions"
set_at: [ startup, runtime ]
cpp_class:
name: OpenReadTransactionParam
data: 'TicketHolder*'
override_ctor: true
wiredTigerEngineRuntimeConfig:
description: 'WiredTiger Configuration'
set_at: runtime
cpp_class:
name: WiredTigerEngineRuntimeConfigParameter
data: 'std::pair<std::string, WiredTigerKVEngine*>'
# The data element of this param gets initialized in three
# disparate ways by different parts of the codebase
# none of which are easily encoded here.
# Defer the initialization with condition: false
# and allow those places to manually set themselves up.
condition: { expr: false }
wiredTigerSessionCloseIdleTimeSecs:
description: 'Close idle wiredtiger sessions in the session cache after this many seconds'
cpp_vartype: 'AtomicWord<std::int32_t>'
cpp_varname: gWiredTigerSessionCloseIdleTimeSecs
set_at: [ startup, runtime ]
default:
# The default is 5 mins with a shorter default in the debug build to aid testing.
expr: 'kDebugBuild ? 5 : 300'
validator:
gte: 0
takeUnstableCheckpointOnShutdown:
description: 'Take unstable checkpoint on shutdown'
cpp_vartype: bool
cpp_varname: gTakeUnstableCheckpointOnShutdown
set_at: startup
default: false
# The "wiredTigerCursorCacheSize" parameter has the following meaning.
#
# wiredTigerCursorCacheSize == 0
# For this setting, cursors are only cached in the WiredTiger storage engine
# itself. Operations that need exclusive access such as drop or verify will
# not be blocked by inactive cached cursors with this setting. However, this
# setting may reduce the performance of certain workloads that normally
# benefit from cursor caching above the storage engine.
#
# wiredTigerCursorCacheSize > 0
# WiredTiger-level caching of cursors is disabled but cursor caching does
# occur above the storage engine. The value of this setting represents the
# maximum number of cursors that are cached. Setting the value to 10000 will
# give the old (<= 3.6) behavior. Note that cursors remain cached, even when a
# session is released back to the cache. Thus, exclusive operations may be
# blocked temporarily, and in some cases, a long time. Drops that fail because
# of exclusivity silently succeed and are queued for retries.
#
# wiredTigerCursorCacheSize < 0
# This is a hybrid approach of the above two, and is the default. The the
# absolute value of the setting is used as the number of cursors cached above
# the storage engine. When a session is released, all cursors are closed, and
# will be cached in WiredTiger. Exclusive operations should only be blocked
# for a short time, except if a cursor is held by a long running session. This
# is a good compromise for most workloads.
wiredTigerCursorCacheSize:
description: 'Wired tiger cursor cache size'
set_at: [ startup, runtime ]
cpp_vartype: 'AtomicWord<std::int32_t>'
cpp_varname: gWiredTigerCursorCacheSize
default: -100
wiredTigerMaxCacheOverflowSizeGB:
description: >-
Maximum amount of disk space to use for cache overflow;
Defaults to 0 (unbounded)
set_at: runtime
cpp_class:
name: WiredTigerMaxCacheOverflowSizeGBParameter
data: 'std::pair<double, WiredTigerKVEngine*>'
override_set: true
condition: { expr: false }
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