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From StephanEwen <...@git.apache.org>
Subject [GitHub] flink issue #1668: [FLINK-3257] Add Exactly-Once Processing Guarantees for I...
Date Tue, 13 Dec 2016 10:09:03 GMT
Github user StephanEwen commented on the issue:

    @senorcarbone I agree, let's fix the multiple checkpoints issue and do the rest in FLIP-15
    The other operators have a pretty simply way of doing this:
      - for synchronous checkpointed operators, no need to do anything, the synchronous part
of one checkpoint is over when the next starts (because it is synchronous ;-))
      - for asynchronously checkpointed state, the state backend needs to be able to hold
multiple snapshots, which are saved by multiple background threads
      - none of the operators deal with in-flight data, which makes their job easy
    Dealing with in-flight data probably means that you need to open a ListState for each
checkpoint that arrives and add the feed back values to each state, until that particular
checkpoints barrier comes back through the feedback channel. I think that should be sufficient.

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