Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/4050#issuecomment-71537583
> If we use a inputFormat that donât instanc of
org.apache.hadoop.mapreduce.lib.input.{CombineFileSplit, FileSplit}, then we
can't get information of input metrics.
This is the desired behavior. The input metrics are currently only able to
track the bytes read from a Hadoop-compatible file system. Many InputFormats
(e.g. DBInputFormat) don't read from Hadoop-compatible file systems, so
reporting "bytes read" would be misleading.
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