Overview

"Clean your room before you go outside."

"Yes ma'am!"

do nothing, and go right outside.

"Hey! I thought I told you to clean your room?!? Come back here and start cleaning!"

"Yes ma'am!"

do nothing, and keep on playing.

This is a Riak KV storage backend that does essentially the least amount of work possible to satisfy a complete implementation of the riak_kv_backend behavior.

It creates a static Riak Object on startup, stores that in the State, and passes it directly back on every GET request. PUT and DELETE requests simply return {ok, State} without doing any work at all.

The idea is to use this as a way to figure out the maximum possible throughput and lowest possible latency that riak_kv running on riak_core is capable of by not doing any actual work at the storage layer.

Conceptually similar to the purpose of the riak_kv_yessir_backend except it does even less work before simply returning ok.

Installation

Pre-requisites: You must build this using the same version of Erlang that was used to build Riak, or build it with the version of Erlang that is bundled with Riak.

$ git clone https://github.com/nathanaschbacher/riak_kv_yesmaam_backend.git
$ cd riak_kv_yesmaam_backend
$ erlc riak_kv_yesmaam_backend.erl

This should create a riak_kv_yesmaam_backend.beam file in the same directory as the .erl file.

Then you need to copy the riak_kv_yesmaam_backend.beam to the lib or lib/basho-patches directory of your Riak install.

$ cp ./riak_kv_yesmaam_backend.beam /path/to/riak/lib/basho-patches/riak_kv_yesmaam_backend.beam

You should be already to go.

Usage

Edit app.config to set your storage backend to use riak_kv_yesmaam_backend and optionally set the yesmaam_mode flag to have the backend return not_found for every GET request.

%% Riak KV config
{riak_kv, [
            {storage_backend, riak_kv_yesmaam_backend},

            %% the available modes are yes_maam and no_maam
            %%
            %% yes_maam: returns a static object on GET.
            %% no_maam: returns not_found on GET.
            %%
            %% defaults to yes_maam
            {yesmaam_mode, yes_maam},
          ]},

License

(The MIT License)

Copyright (c) 2013 Nathan Aschbacher

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.