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resharding_server_parameters.idl
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resharding_server_parameters.idl
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# Copyright (C) 2020-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 parameters for resharding.
global:
cpp_namespace: "mongo::resharding"
imports:
- "mongo/idl/basic_types.idl"
server_parameters:
reshardingCollectionClonerBatchSizeInBytes:
description: >-
Limit for the number of bytes of data inserted per storage transaction (WriteUnitOfWork)
by ReshardingCollectionCloner.
set_at: startup
cpp_vartype: int
cpp_varname: gReshardingCollectionClonerBatchSizeInBytes
default:
expr: 100 * 1024
validator:
gte: 1
reshardingTxnClonerProgressBatchSize:
description: >-
Number of config.transactions records from a donor shard to process before recording the
lsid locally to resume from on primary failover or server restart.
set_at: startup
cpp_vartype: int
cpp_varname: gReshardingTxnClonerProgressBatchSize
default: 1000
validator:
gte: 1
reshardingWriterThreadCount:
description: >-
The number of threads in the thread pool used by *each* ReshardingOplogApplier to apply
oplog entries from the corresponding donor shard. There is one ReshardingOplogApplier
instance per donor shard.
set_at: startup
cpp_vartype: int
cpp_varname: gReshardingWriterThreadCount
default: 4
validator:
gte: 1
lte: 256
reshardingBatchLimitOperations:
description: >-
The maximum number of operations for ReshardingOplogApplier to apply in a single batch.
set_at: startup
cpp_vartype: int
cpp_varname: gReshardingBatchLimitOperations
default: 1
validator:
gte: 1
lte:
expr: 1000 * 1000
useReshardingOplogApplicationRules:
description: >-
Whether or not the ReshardingOplogApplier should use ReshardingOplogApplicationRules
when applying operations during. If false, will use standard oplog application rules.
set_at: "startup"
cpp_vartype: bool
cpp_varname: gUseReshardingOplogApplicationRules
default: false
reshardingTempInterruptBeforeOplogApplication:
description: >-
Whether or not the resharding operation will be interrupted on the recipient before the
ReshardingOplogApplier runs.
set_at: startup
cpp_vartype: bool
cpp_varname: gReshardingTempInterruptBeforeOplogApplication
default: true
reshardingOplogApplierMaxLockRequestTimeoutMillis:
description: >-
The max number of milliseconds that the resharding oplog applier will wait for lock
acquisition.
set_at: [startup, runtime]
cpp_vartype: AtomicWord<int>
cpp_varname: gReshardingOplogApplierMaxLockRequestTimeoutMillis
default: 5