sezruby commented on PR #17754:
URL: https://github.com/apache/iceberg/pull/17754#issuecomment-5637541826

   Reviewed this end to end. The concurrent-DV merge is correct — the union 
preserves all deleted positions given the one-DV-per-file invariant, and 
restricting merges to DELETE-sourced snapshots (`mergeableSnapshotIds`) 
correctly excludes overwrite/replace-added DVs. Test coverage is comprehensive: 
retry idempotency, a concurrent DV replaced between attempts (with the prior 
merged file's deletion asserted), cleanup on commit failure, and the 
fail-closed cases for adds/removes-data-files and overwrite-sourced DVs.
   
   @uros-b the FileIO-resolved cleanup-location comment looks addressed — would 
you mind another look? This is a clean base to extend row-level concurrency to 
UPDATE/MERGE.


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