Github user ramkrish86 commented on the issue:
https://github.com/apache/flink/pull/2332
I can take this up and come up with a design doc. Reading thro the comments
here and the final decision points I think only puts/deletes can be considered
idempotent. But increments/decrements cannot be considered to be idempotent. We
may need to two types of sink then one sink which supports the puts/deletes and
the other one where we need to support non-idempotent ops.
Coming to @nielsbasjes issue of not able to flush the buffered mutator -
should you always call bufferedmutator#flush() on every checkpoint call?
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