Makes mapreduce_test compile.
Makes mapreduce_test compile.

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