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From milind parikh <milindspar...@gmail.com>
Subject Cassandra sink wrt Counters
Date Tue, 10 May 2016 05:48:15 GMT
Given FLINK 3311 & 3332, I am wondering it would be possible,  without
idempotent counters in Cassandra, to deliver on an exactly once sink into
Cassandra. I do note that the verbiage/disc2 in 3332 does warn the user
that this is not exactly "exactly once" sink.

However my question  has to do with whether having idempotent counters and
a Data model that enables all other idempotent operations are a necessary
prerequisite to exactly once semantics in flink.

Asked a different way, what source and sink would enable a end-to-end
exactly - once semantics,  in the current state-of-the-art, with Flink in
the middle.


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