Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/4150#issuecomment-71055028
I think this is a duplicate of #4050, which only adds support for
`CombineFileSplit`s. We shouldn't add support for generic `InputSplit`s
because many input formats do not read from HDFS and having a metrics column
for HDFS-bytes-read in these cases would be confusing and a waste of space.
`getLength` should be defined in all versions of Hadoop, but it doesn't
necessarily mean bytes for all `InputFormat`s. For example, it means # of
records read for `DBInputFormat`.
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