Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/7424#issuecomment-121917173
I was going to say that a load of the iterators implemented in Spark could
be simpler if they used Guava's `AbstractIterator`, since it avoids a bunch of
logic and corner cases, but it may be too hard to convert them now. For example
this still has some minor corner case problems like it will never close the
reader unless `hasNext` is called after the last element is consumed.
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