linliu-code opened a new pull request, #14121:
URL: https://github.com/apache/hudi/pull/14121
### Describe the issue this Pull Request addresses
`NineToEightDowngradeHandler` contains the logic of removing non-V1 index
partitions. This operation would drop these non-V1 partitions, but also refresh
the `hoodie.properties` file for MDT.
This behavior causes incorrect downgrade result because MDT downgrade
happens before DT. Therefore, after MDT has been downgrade from v9 to v8, and
then the dropping non-V1 partitions would rewrite the table version of MDT to
v9 again since it uses V9 table meta client.
This should be a bug since we tried to run all these operations before any
upgrade/downgrade of MDT.
### Summary and Changelog
Move function `UpgradeDowngradeUtils.dropNonV1IndexPartitions` from
`NineToEightDowngradeHandler` to `UpgradeDowngrade` class before MDT
upgrade/downgrade operations.
### Impact
Fixed an incorrect downgrade behavior.
### Risk Level
Medium.
### Documentation Update
<!-- Describe any necessary documentation update if there is any new
feature, config, or user-facing change. If not, put "none".
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default value of the configs are changed.
- Any new feature or user-facing change requires updating the Hudi website.
Please follow the
[instruction](https://hudi.apache.org/contribute/developer-setup#website)
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### Contributor's checklist
- [ ] Read through [contributor's
guide](https://hudi.apache.org/contribute/how-to-contribute)
- [ ] Enough context is provided in the sections above
- [ ] Adequate tests were added if applicable
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