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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.
#
# server setParameters for replication
global:
cpp_namespace: "mongo::repl"
imports:
- "mongo/idl/basic_types.idl"
server_parameters:
# From data_replicator_external_state_impl.cpp
initialSyncOplogBuffer:
description: >-
Set this to specify whether to use a collection to buffer the oplog on the
destination server during initial sync to prevent rolling over the oplog.
set_at: startup
cpp_vartype: std::string
cpp_varname: initialSyncOplogBuffer
default: "collection"
initialSyncOplogBufferPeekCacheSize:
description: Set this to specify size of read ahead buffer in the OplogBufferCollection.
set_at: startup
cpp_vartype: int
cpp_varname: initialSyncOplogBufferPeekCacheSize
default: 10000
# From initial_syncer.cpp
numInitialSyncConnectAttempts:
description: The number of attempts to connect to a sync source
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: numInitialSyncConnectAttempts
default: 10
numInitialSyncOplogFindAttempts:
description: The number of attempts to call find on the remote oplog
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: numInitialSyncOplogFindAttempts
default: 3
initialSyncOplogFetcherBatchSize:
description: The batchSize to use for the find/getMore queries called by the OplogFetcher
set_at: startup
cpp_vartype: int
cpp_varname: initialSyncOplogFetcherBatchSize
# 16MB max batch size / 12 byte min doc size * 10 (for good measure) =
# defaultBatchSize to use.
default:
expr: (16 * 1024 * 1024) / 12 * 10
# From abstract_oplog_fetcher.cpp
oplogInitialFindMaxSeconds:
description: >-
Number of seconds for the `maxTimeMS` on the initial `find` command.
For the initial 'find' request, we provide a generous timeout, to account for
the potentially slow process of a sync source finding the lastApplied optime
provided in a node's query in its oplog.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: oplogInitialFindMaxSeconds
default: 60
oplogRetriedFindMaxSeconds:
description: Number of seconds for the `maxTimeMS` on any retried `find` commands
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: oplogRetriedFindMaxSeconds
default: 2
# From bgsync.cpp
bgSyncOplogFetcherBatchSize:
description: The batchSize to use for the find/getMore queries called by the OplogFetcher
set_at: startup
cpp_vartype: int
cpp_varname: bgSyncOplogFetcherBatchSize
# 16MB max batch size / 12 byte min doc size * 10 (for good measure) =
# defaultBatchSize to use.
default:
expr: (16 * 1024 * 1024) / 12 * 10
rollbackRemoteOplogQueryBatchSize:
description: >-
The batchSize to use for the find/getMore queries called by the rollback
common point resolver. A batchSize of 0 means that the 'find' and 'getMore'
commands will be given no batchSize. We set the default to 2000 to prevent
the sync source from having to read too much data at once, and reduce the
chance of a socket timeout.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: rollbackRemoteOplogQueryBatchSize
# We choose 2000 for (10 minute timeout) * (60 sec / min) * (50 MB / second) /
# (16 MB / document).
default: 2000
forceRollbackViaRefetch:
description: >-
If 'forceRollbackViaRefetch' is true, always perform rollbacks via the
refetch algorithm, even if the storage engine supports rollback via recover
to timestamp.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<bool>
cpp_varname: forceRollbackViaRefetch
default: false
# From noop_writer.cpp
writePeriodicNoops:
description: Sets whether to write periodic noops or not
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<bool>
cpp_varname: writePeriodicNoops
default: true
# From collection_cloner.cpp
numInitialSyncCollectionCountAttempts:
description: The number of attempts for the count command, which gets the document count.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: numInitialSyncCollectionCountAttempts
default: 3
numInitialSyncListIndexesAttempts:
description: The number of attempts for the listIndexes commands.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: numInitialSyncListIndexesAttempts
default: 3
numInitialSyncCollectionFindAttempts:
description: The number of attempts for the find command, which gets the data.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: numInitialSyncCollectionFindAttempts
default: 3
collectionClonerUsesExhaust:
description: Whether to use the "exhaust cursor" feature when retrieving collection data.
set_at: startup
cpp_vartype: bool
cpp_varname: collectionClonerUsesExhaust
default: true
# From database_cloner.cpp
collectionClonerBatchSize:
description: >-
The batch size (number of documents) to use for the queries in the
CollectionCloner. Default of '0' means the limit is the number of documents
that will fit in a single BSON object.
set_at: startup
cpp_vartype: int
cpp_varname: collectionClonerBatchSize
default: 0
validator:
gte: 0
numInitialSyncListCollectionsAttempts:
description: The number of attempts for the listCollections commands.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: numInitialSyncListCollectionsAttempts
default: 3
# From replication_coordinator_external_state_impl.cpp
oplogFetcherSteadyStateMaxFetcherRestarts:
description: >-
Set this to specify the maximum number of times the oplog fetcher will
consecutively restart the oplog tailing query on non-cancellation errors
during steady state replication.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: oplogFetcherSteadyStateMaxFetcherRestarts
default: 1
validator:
gte: 0
oplogFetcherInitialSyncMaxFetcherRestarts:
description: >-
Set this to specify the maximum number of times the oplog fetcher will
consecutively restart the oplog tailing query on non-cancellation errors
during initial sync. By default we provide a generous amount of restarts
to avoid potentially restarting an entire initial sync from scratch.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: oplogFetcherInitialSyncMaxFetcherRestarts
default: 10
validator:
gte: 0
# From oplog_applier.cpp
replWriterThreadCount:
description: The number of threads in the thread pool used to apply the oplog
set_at: startup
cpp_vartype: int
cpp_varname: replWriterThreadCount
default: 16
validator:
gte: 1
lte: 256
replBatchLimitOperations:
description: The maximum number of operations to apply in a single batch
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: replBatchLimitOperations
default:
expr: 5 * 1000
validator:
gte: 1
lte:
expr: 1000 * 1000
replBatchLimitBytes:
description: The maximum oplog application batch size in bytes
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int>
cpp_varname: replBatchLimitBytes
default:
expr: 100 * 1024 * 1024
validator:
gte:
expr: 16 * 1024 * 1024
lte:
expr: 100 * 1024 * 1024
|
