twitter/scalding — pull request #976 by amatsukawa (2014-07-25 22:43:51+00:00)
Title: Do not inherit from FileSource in LzoTraits

`LzoProtobuf`, `LzoThrift`, etc primarily serve to provide the hdfsScheme and do not actually use `FileSource`.
This change enables us to mixin `LzoThrift` into `ParitionSource`, for example.