Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2559
@tzulitai Thanks for thorough review!
I don't understand the problem why the `commitSpecificOffsetsToKafka`
method is designed to commit synchronously. The `FlinkKafkaConsumerBase` has
the pending checkpoints (I think that is what you refer to). It removes the
HashMap of "offsets to commit" from the `pendingCheckpoints` Map synchronously,
before even calling the fetcher to commit.
After that, it looks to me like it does not make a difference how that Map
"offsets to commit" is used (sync or async)...
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