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# Copyright (C) 2022-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 the 'analyzeShardKey' command.
global:
cpp_namespace: "mongo::analyze_shard_key"
imports:
- "mongo/db/basic_types.idl"
server_parameters:
monotonicityCorrelationCoefficientThreshold:
description: The correlation coefficient threshold used to determine if a shard key is
monotonically changing.
set_at: [startup, runtime]
cpp_vartype: AtomicWord<double>
cpp_varname: gMonotonicityCorrelationCoefficientThreshold
default: 0.7
validator:
gt: 0
lte: 1
queryAnalysisQueryStatsSmoothingFactor:
description: The smoothing factor for the exponential moving average of the number
of queries that a sampler executes per second. The average determines the share
of the cluster-wide sample rate that will be assigned to the sampler.
set_at: startup
cpp_vartype: double
cpp_varname: gQueryAnalysisQueryStatsSmoothingFactor
default: 0.125
validator:
gt: 0
lt: 1
queryAnalysisSamplerInActiveThresholdSecs:
description: The minimum amount of time in seconds for a sampler to not report its uptime
before it is considered as inactive.
set_at: [startup, runtime]
cpp_vartype: AtomicWord<int>
cpp_varname: gQueryAnalysisSamplerInActiveThresholdSecs
default:
expr: 5 * 60
validator:
gt: 0
queryAnalysisSamplerConfigurationRefreshSecs:
description: The interval in seconds at which a sampler refreshes its query analysis sample
rates.
set_at: startup
cpp_vartype: int
cpp_varname: gQueryAnalysisSamplerConfigurationRefreshSecs
default: 5
validator:
gt: 0
queryAnalysisSamplerBurstMultiplier:
description: The ratio between the number of queries allowed to be sampled during a burst
and the number of queries allowed to be sampled per second (i.e. the sample
rate).
set_at: [startup, runtime]
cpp_vartype: AtomicWord<double>
cpp_varname: gQueryAnalysisSamplerBurstMultiplier
default: 2
validator:
gte: 1
queryAnalysisWriterIntervalSecs:
description: The interval in seconds at which sampled queries are written to disk.
set_at: startup
cpp_vartype: int
cpp_varname: gQueryAnalysisWriterIntervalSecs
default: 90
validator:
gt: 0
queryAnalysisWriterMaxMemoryUsageBytes:
description: The maximum amount of memory in bytes that the writer is allowed to use for
buffering sampled queries and diffs combined.
set_at: [startup, runtime]
cpp_vartype: AtomicWord<int>
cpp_varname: gQueryAnalysisWriterMaxMemoryUsageBytes
default:
expr: 100 * 1024 * 1024
validator:
gt: 0
queryAnalysisWriterMaxBatchSize:
description: The maximum number of sampled queries to write to disk at once.
set_at: [startup, runtime]
cpp_vartype: AtomicWord<int>
cpp_varname: gQueryAnalysisWriterMaxBatchSize
default: 100000
validator:
gt: 0
queryAnalysisWriterMinThreadPoolSize:
description: The minimum number of threads in the writer's thread pool.
set_at: startup
cpp_vartype: int
cpp_varname: gQueryAnalysisWriterMinThreadPoolSize
default: 0
validator:
gte: 0
queryAnalysisWriterMaxThreadPoolSize:
description: The maximum number of threads in the writer's thread pool.
set_at: startup
cpp_vartype: int
cpp_varname: gQueryAnalysisWriterMaxThreadPoolSize
default: 8
validator:
gte: 1
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