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, 32 deletions

diff --git a/src/mod_pubsub_riak.erl b/src/mod_pubsub_riak.erl
deleted file mode 100644
index 87000a85c..000000000
--- a/src/mod_pubsub_riak.erl
+++ /dev/null
@@ -1,32 +0,0 @@
-%%%----------------------------------------------------------------------
-%%% ejabberd, Copyright (C) 2002-2019   ProcessOne
-%%%
-%%% This program is free software; you can redistribute it and/or
-%%% modify it under the terms of the GNU General Public License as
-%%% published by the Free Software Foundation; either version 2 of the
-%%% License, or (at your option) any later version.
-%%%
-%%% This program is distributed in the hope that it will be useful,
-%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
-%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-%%% General Public License for more details.
-%%%
-%%% You should have received a copy of the GNU General Public License along
-%%% with this program; if not, write to the Free Software Foundation, Inc.,
-%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-%%%
-%%%----------------------------------------------------------------------
--module(mod_pubsub_riak).
-
-%% API
--export([init/3]).
-
-%%%===================================================================
-%%% API
-%%%===================================================================
-init(_Host, _ServerHost, _Opts) ->
-    ok.
-
-%%%===================================================================
-%%% Internal functions
-%%%===================================================================