Examining the Riak ring

ring_examples.erl

%% Get the state for the local node
%% The get_my_ring function really returns the ring
%% plus other state information about the cluster.
{ok, State} = riak_core_ring_manager:get_my_ring().

%% Get number of partitions
riak_core_ring:num_partitions(State).

%% Get the names of custom buckets
riak_core_ring:get_buckets(State).

%% List the ring indexes owned by this node
riak_core_ring:my_indices(State).

%% Get the preflists for each vnode for a given n_val e.g. 3
%% This will produce a list of lists where each sub-list will
%% contain 3 entries representing the first 3 preference list
%% entries for each vnode on the ring.
riak_core_ring:all_preflists(State, 3).

%% Show the node that owns a given vnode index.
%% We'll use the index 0, but you may use any of 
%% the vnode indices.
riak_core_ring:index_owner(State, 0).

%% Produce a list of all cluster nodes
riak_core_ring:all_members(State).