Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/5377#issuecomment-96842148
I made the changes to report non-zero written bytes
(https://github.com/vanzin/spark/commit/346f8291a91b0b73742263d7a23ee4027d76adb9).
But after writing and testing it, I kinda started questioning whether it will
improve anything...
`0` or `1` are basically returned in the same situation: the underlying
channel does not have enough buffer. So returning non-zero would cause netty to
"busy loop" and call `transferTo` again, which would fail to write anything and
thus would now return 0.
But I guess this makes the code behave more like it would with other
non-hacky `FileRegion` implementations.
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