Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/5709#issuecomment-96436586
Could it be confusing to users that the ID associated with each record
might be different on stage or task retries? The fact that ordering within a
partition is not deterministic has caused people some concern in the past, and
I wonder if this could sort of lead to more confusion since you are giving some
_sort of_ ordering semantics.
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