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Type: Task
Resolution: Fixed
Priority: Major - P3
Fix Version/s: 8.1.0-rc0, 8.0.0-rc6
Affects Version/s: None
Component/s: None
Labels:
None

Assigned Teams:

Catalog and Routing
Backwards Compatibility:
Fully Compatible
Backport Requested:

v8.0
Sprint:
CAR Team 2024-05-27
Linked BF Score:
200
Confidence Status:
None
Work Order:
3
CAR Domain/s:
None

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name(s):
None
Goal Link:
None

Several DDL coordinators are executing operations on multiple shards by retrieving their list from the shard registry when needed, often assuming the set of shards to be stable during the whole duration of the DDL.
As a consequence, when shards are added/removed while DDLs are ongoing may result in partially executing metadata changes on some shards (in the best cases) and potentially in causing coordinators to get stuck (in the worse cases).

Purpose of this ticket is to provide a novel synchronization/serialization mechanism between DDLs and add/remove shard so that they can be executed concurrently with no side effects.

causes

SERVER-91475 Make the _shardsvrJoinDDLCoordinators command resilient to FailedToSatisfyReadPreference exception

Closed

fixes

SERVER-90291 Resharding can race with transitionToDedicatedConfigsvr to recreate databases on config shard

Closed

has to be done before

SERVER-87831 Undo workaround done by SERVER-87137

Closed

is depended on by

SERVER-90224 Run sharding metadata consistency checks after ContinuousConfigShardTransition hook completes a transition

Closed

is duplicated by

SERVER-90629 moveCollection is allowed to run after a shard has finished draining resulting in data on a rs that is no longer a shard

Closed

related to

SERVER-86015 ShardCollection should not create chunks on a draining shard

Closed

SERVER-87137 Support drop/rename collection DDL ops with transitionToDedicatedConfigServer

Closed

SERVER-90151 Incorrect collection sharding metadata can be left on dedicated config server after concurrent dropCollection

Closed

SERVER-89841 Investigate DDL LockBusy errors in config transition suite tests

Closed

SERVER-90786 SERVER-90786 execute again tests excluded due to add/remove shard issue solved by SERVER-56879

Closed

(5 related to)

Assignee:: Jordi Serra Torrens
Reporter:: Pierlauro Sciarelli
Participants:: Githook User, Jordi Serra Torrens, Pierlauro Sciarelli
Votes:: 0 Vote for this issue
Watchers:: 3 Start watching this issue

Created:: May 12 2021 06:59:55 AM UTC
Updated:: Jul 10 2024 06:17:44 PM UTC
Resolved:: May 23 2024 02:43:04 PM UTC

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