[SERVER-57182] reshardCollection command is shuffling data even when requested shard key already matches Created: 25/May/21  Updated: 29/Oct/23  Resolved: 10/Jun/21

Status: Closed
Project: Core Server
Component/s: Sharding
Affects Version/s: None
Fix Version/s: 5.0.0-rc2, 5.1.0-rc0

Type: Bug Priority: Major - P3
Reporter: Max Hirschhorn Assignee: Haley Connelly
Resolution: Fixed Votes: 0
Labels: PM-234-M3, PM-234-T-lifecycle, post-rc0
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Backports
Related
Backwards Compatibility: Fully Compatible
Operating System: ALL
Backport Requested:
v5.0
Sprint: Sharding 2021-06-14, Sharding 2021-05-31
Participants:
Story Points: 1

 Description   

The reshardCollection command should instead return {ok: 1} without migrating any data when the request shard key pattern already matches the current one.

The reshardCollection command is a long-running operation and the client's connection may get disconnected. It is important for the reshardCollection command to be manually retried by the client without causing a new instance of resharding the collection to occur had the earlier instance already completed.



 Comments   
Comment by Vivian Ge (Inactive) [ 06/Oct/21 ]

Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it’s been triggered. For more active release information, please keep an eye on #server-release. Thank you!

Comment by Githook User [ 15/Jun/21 ]

Author:

{'name': 'Haley Connelly', 'email': 'haley.connelly@mongodb.com', 'username': 'haleyConnelly'}

Message: SERVER-57182 reshardCollection command is shuffling data even when requested shard key already matches

(cherry picked from commit df3f17d4ae56f4d22304498405fb072d9627f14a)
Branch: v5.0
https://github.com/mongodb/mongo/commit/9a804b395df987000d8bdab9ef14ef1ba19e03df

Comment by Githook User [ 10/Jun/21 ]

Author:

{'name': 'Haley Connelly', 'email': 'haley.connelly@mongodb.com', 'username': 'haleyConnelly'}

Message: SERVER-57182 reshardCollection command is shuffling data even when requested shard key already matches
Branch: master
https://github.com/mongodb/mongo/commit/df3f17d4ae56f4d22304498405fb072d9627f14a

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