Github user gyfora commented on the pull request:
https://github.com/apache/flink/pull/1305#issuecomment-153695943
I updated this PR with the reworked logic, it has several advantages over
the previous timestamp based solution (including the elimination of
transactions from the logic).
The only problem I see is that the derby batch inserts happen row by row
currently as it does not have the insert or update semantics.
This rework will also make it easier to write connectors to non
transactional stores like Cassandra
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