Github user tzulitai commented on the issue:
https://github.com/apache/flink/pull/4239
Regarding how I would proceed with this big contribution:
Lets first try to clean up the commits that are bundled all together here.
1. I would first try to merge #4321 (the first 4 commits) and #4310
(af7ed19) and get those out of the way.
2. For a06cb94 (`TwoPhaseCommitSinkFunction`), could you open a separate PR
with unit tests covered?
3. After the above is all sorted out, we rebase this again.
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