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# Copyright (C) 2019-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/transaction_participant.h"
server_parameters:
maxTransactionLockRequestTimeoutMillis:
description: >-
Max number of milliseconds that any transaction lock request
will wait for lock acquisition. If an operation provides a greater timeout in a lock request,
maxTransactionLockRequestTimeoutMillis will override it. If this is set to a negative value, it
is inactive and nothing will be overridden.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: gMaxTransactionLockRequestTimeoutMillis
# 5 milliseconds will help avoid deadlocks, but will still allow fast-running metadata operations
# to run without aborting transactions.
default: 5
transactionLifetimeLimitSeconds:
description: >-
Lifetime given to each transaction.
Transactions must eventually expire to preempt storage cache pressure immobilizing the system.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<decltype(TransactionParticipant::observeTransactionLifetimeLimitSeconds)::Argument>
cpp_varname: gTransactionLifetimeLimitSeconds
validator:
gte: 1
on_update: std::ref(TransactionParticipant::observeTransactionLifetimeLimitSeconds)
default: 60
maxNumberOfTransactionOperationsInSingleOplogEntry:
description: >-
Maximum number of operations to pack into a single oplog entry, when multi-oplog
format for transactions is in use.
set_at: startup
cpp_vartype: int
cpp_varname: gMaxNumberOfTransactionOperationsInSingleOplogEntry
default: 2147483647 # INT_MAX
validator: { gte: 1 }
transactionSizeLimitBytes:
description: >-
Maximum total size of operations in a multi-document transaction.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<long long>
cpp_varname: gTransactionSizeLimitBytes
default:
expr: std::numeric_limits<long long>::max()
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