Adds more logging to mapreduce code.
Adds more logging to mapreduce code.

wideioltd/pachyderm,klucar/pachyderm,ShengjieLuo/pachyderm,henrylee2cn/pachyderm,wideioltd/pachyderm,sambooo/pachyderm,sambooo/pachyderm,alexdebrie/pachyderm,pachyderm/pfs,henrylee2cn/pachyderm,pachyderm/pfs,ShengjieLuo/pachyderm,kunthar/pachyderm,pachyderm/pfs,ShengjieLuo/pachyderm,klucar/pachyderm,phacops/pachyderm,sambooo/pachyderm,phacops/pachyderm,klucar/pachyderm,alexdebrie/pachyderm,alexdebrie/pachyderm,kunthar/pachyderm