[SERVER-45047] Create multiVersion test to validate mixed FCV migrations Created: 10/Dec/19  Updated: 29/Oct/23  Resolved: 20/Dec/19

Status: Closed
Project: Core Server
Component/s: Sharding
Affects Version/s: None
Fix Version/s: 4.3.3

Type: Task Priority: Major - P3
Reporter: Alexander Taskov (Inactive) Assignee: Alexander Taskov (Inactive)
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Backwards Compatibility: Fully Compatible
Sprint: Sharding 2019-12-16, Sharding 2019-12-30
Participants:

 Description   

A v4.4 shard node obeys the following rules:

  • The setFCV command and migrations serialize on the shard
  • This guarantees that a shard's FCV does not change while the shard is donating or receiving a chunk
  • When the shard's FCV is "upgrading" or "downgrading", the shard fails to start donating or receiving a chunk
  • When the shard's FCV is "downgraded", the shard uses the 4.2 protocol for donating and receiving chunks
  • When the shard's FCV is "upgraded", the shard uses the 4.4 protocol for donating and receiving chunks


 Comments   
Comment by Githook User [ 20/Dec/19 ]

Author:

{'name': 'Alex Taskov', 'email': 'alex.taskov@mongodb.com', 'username': 'alextaskov'}

Message: SERVER-45047 Create multiVersion test to validate mixed FCV migrations
Branch: master
https://github.com/mongodb/mongo/commit/b1e7c36eb3af8ecbb9fe7fc02711fc2c38d8f2b2

Comment by Alexander Taskov (Inactive) [ 13/Dec/19 ]

https://mongodbcr.appspot.com/540750008/

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