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https://issues.apache.org/jira/browse/HUDI-7900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17882225#comment-17882225
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Ethan Guo commented on HUDI-7900:
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The bottom line is:
* Some indexes, e.g., RLI, take time to build so they should be kept the
already built index as much as possible to avoid re-initialization time.
* During upgrade/download, the MDT should be fully compacted.
To support this, we need to revisit:
* How the completion time in Hudi 1.0 affects the compatibility of reader
across versions, i.e., before and after upgrades/downgrades.
> Downgrade handles to delete new MDT partitions and cleanup MDT table
> properties
> -------------------------------------------------------------------------------
>
> Key: HUDI-7900
> URL: https://issues.apache.org/jira/browse/HUDI-7900
> Project: Apache Hudi
> Issue Type: Task
> Reporter: Sagar Sumit
> Assignee: Lin Liu
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.0.0
>
>
> {code:java}
> {code}
> The newer metadata partitions such as secondary_index or partitin_stats etc
> are only meant for 1.x . So if someone had created these indexes and then
> later downgraded to 0.x then we need to ensure that hoodie.properties should
> not show these indexes as available. Ideally, we would want to drop the
> metadata partition altogether.
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