Github user XuPingyong commented on the issue:
    Thanks @greghogan. 
          I think  the InputFormat can return anything, may be null or other 
immutable objects that cannot be passed to nextRecord.
         And I am also not clear why the object passed to nextRecord may be 
reused internally by the InputFormat. The param of nextRecord named reuse means 
it may be re-passed to this call again?
        What do you think?

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