Github user gyfora commented on the pull request:
https://github.com/apache/flink/pull/1305#issuecomment-153337412
You are right about the checkpointIDs being ignored. I don't see why we
need to bother with changing the id semantics, the timestamps also serve as
checkpoint Ids perfectly (in fact we could drop the checkpoint ID everywhere in
Flink and just keep the timestamp).
The good thing about timestamps is that they are not incremental, meaning
that if the first checkpoint have ts = 100 and the second has ts = 5100 then we
can write the intermediate updates with ts 101, 102 ... while maintaining
uniqueness and monotonicity. This is something that we use here and that is why
I am using timestamps instead of ids.
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