GitHub user vinothchandar added a comment to the discussion: RocksDB as The 
Replica of MDT/RLI

> “Record location does not change” only covers existing keys. For a new key, 
> multiple writers may all miss it in their local RLI replicas and 
> independently assign it to different file groups.

you are right. that was my miss. So, how would we make this safe in face of 
multi-writers? (for general inserts, doing uniqueness check is doable, but 
expensive. we have not taken that up. separate topic). 

GitHub link: 
https://github.com/apache/hudi/discussions/18296#discussioncomment-18259149

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