Github user srowen commented on the issue:
https://github.com/apache/spark/pull/9973
You're right but lots of output semantics are per partition. I don't think
we can do the update in one transaction no matter what. This improves the
behavior in many cases so is worthwhile behavior but doesn't make this truly
bulletproof or idempotrnt no matter what. The operation can still fail after
the commit of any partition and then fail on reexecution .
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