SEZ9 commented on PR #12567:
URL: https://github.com/apache/seatunnel/pull/12567#issuecomment-5976288130

   Thanks for the follow-up. Carrying each table's own checkpoint offset 
through the reader state, the checkpointed `IncrementalSplit`, the enumerator 
restore and the fetcher's exactly-once filter seed is the right direction for 
the earlier concern: at 712db9b0fe the fallback was the split-level startup 
offset, which is the minimum across tables, so with incremental parallelism 
greater than 1 restored tables could re-emit already-delivered events under 
`exactly_once`.
   
   I have not yet verified the cf0840a030 diff myself, so I don't want to mark 
the earlier points resolved on description alone. Since the latest review at 
cf0840a030 requests changes, it would help if, alongside that, you could point 
me to where the head diff covers:
   
   1. **Per-table fallback:** the end-to-end path (reader checkpoint, 
`IncrementalSplit` serialization, enumerator state, re-created fetcher) that 
seeds every restored table from its own offset, and how a table with no 
per-table entry is handled.
   2. **Integration test:** an IT that enables `exactly_once`, uses incremental 
parallelism greater than 1, writes to the pre-existing table after restore, and 
asserts exactly one copy of each event on the sink.
   3. **Unit test:** whether the fetcher test now drives `submitTask` or a 
test-visible hook rather than reaching `configureFilter` via 
`getDeclaredMethod`.
   
   Happy to take another pass once those are in place.
   
   <!-- streview-comment:1512 -->


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