Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/896#issuecomment-120305327
The reporter object has the advantage that it is more easily extensible. At
some point we will want to differentiate between locally received bytes, and
remotely received bytes, for example. Or include wait/stall times to detect
whether a task is throttled by a slower predecessor.
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