[DOCS-14565] Investigate changes in SERVER-55430: Record metrics about whether a collection is rebalanced after resharding op finishes Created: 14/Jun/21  Updated: 13/Nov/23  Resolved: 30/Sep/21

Status: Closed
Project: Documentation
Component/s: manual, Server
Affects Version/s: None
Fix Version/s: 5.0.0-rc3, 5.1.0-rc0, Server_Docs_20231030, Server_Docs_20231106, Server_Docs_20231105, Server_Docs_20231113

Type: Task Priority: Major - P3
Reporter: Backlog - Core Eng Program Management Team Assignee: Ian Fogelman
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Backports
backported by DOCS-14595 [SERVER] BACKPORT v5.0: Record metric... Closed
Documented
documents SERVER-55430 Record metrics about whether a collec... Closed
Participants:
Days since reply: 2 years, 18 weeks, 6 days ago
Epic Link: DOCSP-14300
Story Points: 3

 Description   

Description

Downstream Change Summary

New field added to serverStatus metrics under shardingStatistics.resharding: lastOpEndingChunkImbalance. This field contains the largest diff (maxNumChunksInShard - minNumChunksInShard) among all zones for the collection that went through the last resharding operation. This is only updated on the config servers.

Description of Linked Ticket

Resharding attempts to create an initial chunk distribution such that the collection will not be rebalanced by the balancer immediately after (absent of any topology changes, etc of course). It would be useful to collect metrics on whether the balancer rebalances a collection that has just been resharded in order to determine whether resharding's initial split policy is in fact creating a good initial distribution.

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)



 Comments   
Comment by Githook User [ 30/Sep/21 ]

Author:

{'name': 'ian fogelman', 'email': 'ian.fogelman@mongodb.com', 'username': 'ianf-mongodb'}

Message: DOCS-14565 serverStatus lastOpEndingChunkImbalance
Branch: master
https://github.com/mongodb/docs/commit/e54136b979a77667a7a405818a067269d1dfce1b

Comment by Ian Fogelman [ 30/Sep/21 ]

Hi Randolph, one extra questions I had with this one is given that it is a backport to 5.0, do you think the 5.1 release-notes should be updated or the 5.0 release-notes?

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