Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1341#issuecomment-168211441
This change is only relevant when programs do NOT have checkpointing
activated.
In those cases Flink will periodically commit the current stream offsets to
Kafka. Previously, Flink never committed offsets without checkpointing, meaning
that Kafka clients never saw progress.
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