Github user davies commented on the pull request:
https://github.com/apache/spark/pull/13107#issuecomment-221993686
@rxin After fixing those two, we still have some other limits (the number
of elements should be less than 512 mm), especially for on-heap mode. There are:
1) the largest memory block is 8G in on-heap mode, so the number of
elements should be less than 512M.
2) for both Radix sort and time sort, the underlying array could not 2G (or
overflow), the number of records should be less than 1G
3) For sorted iterator, the underlying array could not be larger than 2G.
So we still need to check the number of elements, then do spilling, or the
job could fail in unexpected way.
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