Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/2087#issuecomment-56461580
MapReduce doesn't use getPos, but it does look like it might be helpful in
some situations. One caveat is that pos only means # bytes for file input
formats. For example, for DBInputFormat, it means the number of records.
If we choose to use getPos for pre-2.5 Hadoop, my preference would be to
make that change in a separate patch.
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