title: How can i use Riak as backend for mod_mam on ejabberd 16.04?
body: <p>I want to save all message from Ejabberd chat node to Riak.
  How can i use Riak as backend for mod_mam on Rjabberd 16.04?
  mod_mam is a Ejabberd module, This module implements Message Archive Management in XEP-0313.</p>