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sharding_feature_flags.idl
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sharding_feature_flags.idl
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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.
#
# File containing feature flags for sharding features
global:
cpp_namespace: "mongo"
feature_flags:
featureFlagGlobalIndexesShardingCatalog:
description: "Feature flag for enabling sharding catalog features for global indexes"
cpp_varname: feature_flags::gGlobalIndexesShardingCatalog
default: false
shouldBeFCVGated: true
featureFlagConcurrencyInChunkMigration:
description: "Feature flag for enabling concurrency within a chunk migration"
cpp_varname: feature_flags::gConcurrencyInChunkMigration
default: true
version: 6.3
shouldBeFCVGated: true
featureFlagCheckForDirectShardOperations:
description: "Feature flag for checking for direct shard operations."
cpp_varname: feature_flags::gCheckForDirectShardOperations
default: true
version: 7.3
shouldBeFCVGated: true
# TODO (SERVER-73632): Remove once 8.0 becomes last LTS.
featureFlagEmbeddedRouter:
description: "Feature flag to enable shard to double as router"
cpp_varname: feature_flags::gEmbeddedRouter
default: false
shouldBeFCVGated: true
# TODO SERVER-79064: Remove once 8.0 becomes last LTS.
featureFlagAuthoritativeRefineCollectionShardKey:
description: "Feature flag for enabling the authoritative version of the refine collection shard key."
cpp_varname: feature_flags::gAuthoritativeRefineCollectionShardKey
default: true
version: 7.1
shouldBeFCVGated: true
# TODO (SERVER-77915): Remove once 8.0 becomes last LTS.
featureFlagTrackUnshardedCollectionsOnShardingCatalog:
description: "Feature flag for enabling the tracking of user unsharded collection by turning them into a fixed-1-chunk sharded collections"
cpp_varname: feature_flags::gTrackUnshardedCollectionsOnShardingCatalog
default: false
shouldBeFCVGated: true
# TODO (SERVER-68132): Remove once 8.0 becomes last LTS.
featureFlagClusterFsyncLock:
description: "Feature flag to enable locking of a cluster through mongos"
cpp_varname: feature_flags::gClusterFsyncLock
default: true
version: 7.1
shouldBeFCVGated: true
# TODO (SERVER-79304): Remove once 8.0 becomes last LTS.
featureFlagAuthoritativeShardCollection:
description: "Feature flag for enabling the authoritative version of the shardCollection DDL operation."
cpp_varname: feature_flags::gAuthoritativeShardCollection
default: false
shouldBeFCVGated: true
# TODO (SERVER-76436): Remove once 8.0 becomes last LTS.
featureFlagBalanceUnshardedCollections:
description: "Feature flag for enabling the balancing of user unsharded collections"
cpp_varname: feature_flags::gBalanceUnshardedCollections
default: false
shouldBeFCVGated: true
# TODO SERVER-81884: Remove once 8.0 becomes last LTS.
featureFlagOneChunkPerShardEmptyCollectionWithHashedShardKey :
description: "Feature flag to enable creation of one chunk per shard for empty collections with hashed shard key."
cpp_varname: feature_flags::gOneChunkPerShardEmptyCollectionWithHashedShardKey
default: true
shouldBeFCVGated: true
version: 7.2
# TODO (SERVER-76291): Remove once 8.0 becomes last LTS.
featureFlagUpdateOneWithIdWithoutShardKey:
description: "Feature flag for updateOne and deleteOne with _id equality without shard key correctness during chunk migrations."
cpp_varname: feature_flags::gUpdateOneWithIdWithoutShardKey
default: false
shouldBeFCVGated: true
# TODO (SERVER-83264): Remove once 8.0 becomes last LTS.
featureFlagBalancerSettingsSchema:
description: "Feature flag for updating the config settings schema to enforce balancer settings"
cpp_varname: feature_flags::gBalancerSettingsSchema
default: true
version: 7.3
shouldBeFCVGated: true
# TODO (SERVER-83704): Remove once 8.0 becomes last LTS.
featureFlagPlacementHistoryPostFCV73 :
description: "Feature flag that marks a version change in the logic that generates config.placementHistory;
it causes such a collection to be reinitialized on FCV upgrade and placement history queries
to be redirected to config.shards prior to the reinitialization."
cpp_varname: feature_flags::gPlacementHistoryPostFCV3
default: true
version: 7.3
shouldBeFCVGated: true
featureFlagShardedAggregationCatalogCacheGossiping:
description: "Feature flag that makes routers executing distributed aggregations that involve
secondary collections request the shards to gossip back the catalog cache versions
for these collections."
cpp_varname: feature_flags::gShardedAggregationCatalogCacheGossiping
default: true
version: 8.0
shouldBeFCVGated: true
# TODO (SERVER-81037): enable this feature flag once it's possible to detect prepare conflicts on the catalog
featureFlagCreateCollectionInPreparedTransactions:
description: "Feature flag protecting the codepath allowing to create collections in prepared transactions "
cpp_varname: feature_flags::gCreateCollectionInPreparedTransactions
default: false
shouldBeFCVGated: true