rangareddy commented on issue #7925:
URL: https://github.com/apache/hudi/issues/7925#issuecomment-4832967230

   Closing as expected behavior, not an upgrade issue — the 0.8 → 0.12 table 
auto-upgrade works fine; the failure is standard OCC conflict resolution, since 
the logs show both writers touched the same file groups and Hudi aborted the 
loser by design. This is version-independent — multi-writer only succeeds on 
non-overlapping data; retry the failed writer or make the writers 
partition-disjoint. Reopen if two writers on strictly non-overlapping data 
still hit this.


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