Github user rmetzger commented on the issue:
https://github.com/apache/flink/pull/3278
I think we should allow users to disable the wait on flush, because it can
substantially delay the confirmation of a checkpoint.
If a user favors fast checkpoints over complete data in Kafka (for example
when a particular producer instance is used mostly for debugging purposes
only), we should allow them to do that. The overhead for us making this
configurable is very low, but the benefit for some users might be huge.
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