Remove Riak support

Reasons:
- Riak DB development is almost halted after Basho
- riak-erlang-client is abandoned and doesn't work
  correctly with OTP22
- Riak is slow in comparison to other databases
- Missing key ordering makes it impossible to implement range
  queries efficiently (e.g. MAM queries)

1 files changed, 0 insertions, 1 deletions

diff --git a/mix.exs b/mix.exs
index 281ef72f0..c2dd63696 100644
--- a/mix.exs
+++ b/mix.exs
@@ -107,7 +107,6 @@ defmodule Ejabberd.Mixfile do
 
   defp cond_deps do
     for {:true, dep} <- [{config(:sqlite), {:sqlite3, "~> 1.1"}},
-                         {config(:riak), {:riakc, "~> 2.4"}},
                          {config(:redis), {:eredis, "~> 1.0"}},
                          {config(:zlib), {:ezlib, "~> 1.0"}},
                          {config(:pam), {:epam, "~> 1.0"}},