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1. a poll loop which:
   1. calls consumer.poll
   2. process the received records
   3. commits offsets for the just processed records
   4. repeat

The big advantage of this approach is that is the simplest. This is also the only approach that could benefit from auto-commit.

However, this approach has the downside that asynchronous processing can not be used. Approach 2 does allow thisTherefore, we do not consider it further in this KIP.

Approach 2 - asynchronous processing

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