Github user ScrapCodes commented on the issue:
https://github.com/apache/bahir/pull/13
Yes, I think MQTT's client side persistence can be used. We can move any
message that is consumed once by streaming to persistent store. But streaming
may never request certain offsets, for example those were checkpointed earlier.
We can may be have a configurable timeout as well. Since we store every message
along with timestamp it should not be a problem.
P.S. If the persistence is memory - it may also get exhausted eventually
(since it stores every thing on heap in a hashtable).
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