yihua opened a new pull request, #20181: URL: https://github.com/apache/hudi/pull/20181
### Describe the issue this Pull Request addresses issue: #20175 RFC number claimed in #20174; this PR is stacked on it and adds the RFC content. ### Summary and Changelog Adds RFC-114, which proposes a merge-on-read operation mode in which an update becomes a positional delete against the record's current file group plus an insert into a new file slice, so log files carry positional deletes only and every live record stays in a base file. The RFC covers the write config and the decomposition after index tagging, the fail-fast guards, the external table format completion hook on compaction, log compaction and rollback, and the file-system view and table config changes for tables shared with an external table format. Proof-of-concept constraints, index interplay, SPI follow-ups and the first consumer are in appendices. The writer changes are in #20167. ### Impact Documentation only. ### Risk Level none ### Documentation Update none ### Contributor's checklist - [x] Read through [contributor's guide](https://hudi.apache.org/contribute/how-to-contribute) - [x] Enough context is provided in the sections above - [ ] Adequate tests were added if applicable -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
