xushiyan opened a new pull request, #9063:
URL: https://github.com/apache/hudi/pull/9063

   ### Change Logs
   
   When upgrade to table version 6, 
   
   - uncompleted instants are required to be completed or rollback.
   - metadata table should be fully compacted if not done so
   
   When downgrade from table version 6,
   
   - uncompleted instants are required to be completed or rollback.
   - record-index partition should be removed from metadata table if exists
   
   ### Impact
   
   Upgrade/downgrade flows
   
   ### Risk level 
   
   Medium.
   
   - [ ] UT and e2e verification.
   
   ### Documentation Update
   
   - [ ] should be highlighted in the release notes as part of the migration 
guide
   
   ### Contributor's checklist
   
   - [ ] Read through [contributor's 
guide](https://hudi.apache.org/contribute/how-to-contribute)
   - [ ] Change Logs and Impact were stated clearly
   - [ ] Adequate tests were added if applicable
   - [ ] CI passed
   


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