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Merge pull request #52 from basho/arg-join-to-core
move join/leave/transfers/ringready from riak_kv to riak_core
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| %% ------------------------------------------------------------------- | ||
| %% | ||
| %% Riak: A lightweight, decentralized key-value store. | ||
| %% | ||
| %% Copyright (c) 2007-2011 Basho Technologies, Inc. All Rights Reserved. | ||
| %% | ||
| %% This file is provided to you under the Apache License, | ||
| %% Version 2.0 (the "License"); you may not use this file | ||
| %% except in compliance with the License. You may obtain | ||
| %% a copy of the License at | ||
| %% | ||
| %% http://www.apache.org/licenses/LICENSE-2.0 | ||
| %% | ||
| %% Unless required by applicable law or agreed to in writing, | ||
| %% software distributed under the License is distributed on an | ||
| %% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| %% KIND, either express or implied. See the License for the | ||
| %% specific language governing permissions and limitations | ||
| %% under the License. | ||
| %% | ||
| %% ------------------------------------------------------------------- | ||
| -module(riak_core_status). | ||
| -export([ringready/0, transfers/0]). | ||
|
|
||
| -spec(ringready() -> {ok, [atom()]} | {error, any()}). | ||
| ringready() -> | ||
| case get_rings() of | ||
| {[], Rings} -> | ||
| {N1,R1}=hd(Rings), | ||
| case rings_match(hash_ring(R1), tl(Rings)) of | ||
| true -> | ||
| Nodes = [N || {N,_} <- Rings], | ||
| {ok, Nodes}; | ||
|
|
||
| {false, N2} -> | ||
| {error, {different_owners, N1, N2}} | ||
| end; | ||
|
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| {Down, _Rings} -> | ||
| {error, {nodes_down, Down}} | ||
| end. | ||
|
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||
|
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| -spec(transfers() -> {[atom()], [{waiting_to_handoff, atom(), integer()} | | ||
| {stopped, atom(), integer()}]}). | ||
| transfers() -> | ||
| {Down, Rings} = get_rings(), | ||
|
|
||
| %% Work out which vnodes are running and which partitions they claim | ||
| F = fun({N,R}, Acc) -> | ||
| {_Pri, Sec, Stopped} = partitions(N, R), | ||
| Acc1 = case Sec of | ||
| [] -> | ||
| []; | ||
| _ -> | ||
| [{waiting_to_handoff, N, length(Sec)}] | ||
| end, | ||
| case Stopped of | ||
| [] -> | ||
| Acc1 ++ Acc; | ||
| _ -> | ||
| Acc1 ++ [{stopped, N, length(Stopped)} | Acc] | ||
| end | ||
| end, | ||
| {Down, lists:foldl(F, [], Rings)}. | ||
|
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|
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| %% =================================================================== | ||
| %% Internal functions | ||
| %% =================================================================== | ||
|
|
||
| %% Retrieve the rings for all other nodes by RPC | ||
| get_rings() -> | ||
| {RawRings, Down} = riak_core_util:rpc_every_member( | ||
| riak_core_ring_manager, get_my_ring, [], 30000), | ||
| Rings = orddict:from_list([{riak_core_ring:owner_node(R), R} || {ok, R} <- RawRings]), | ||
| {lists:sort(Down), Rings}. | ||
|
|
||
| %% Produce a hash of the 'chash' portion of the ring | ||
| hash_ring(R) -> | ||
| erlang:phash2(riak_core_ring:all_owners(R)). | ||
|
|
||
| %% Check if all rings match given a hash and a list of [{N,P}] to check | ||
| rings_match(_, []) -> | ||
| true; | ||
| rings_match(R1hash, [{N2, R2} | Rest]) -> | ||
| case hash_ring(R2) of | ||
| R1hash -> | ||
| rings_match(R1hash, Rest); | ||
| _ -> | ||
| {false, N2} | ||
| end. | ||
|
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||
|
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| %% Get a list of active partition numbers - regardless of vnode type | ||
| active_partitions(Node) -> | ||
| lists:foldl(fun({_,P}, Ps) -> | ||
| ordsets:add_element(P, Ps) | ||
| end, [], running_vnodes(Node)). | ||
|
|
||
| %% Get a list of running vnodes for a node | ||
| running_vnodes(Node) -> | ||
| Pids = vnode_pids(Node), | ||
| [rpc:call(Node, riak_core_vnode, get_mod_index, [Pid], 30000) || Pid <- Pids]. | ||
|
|
||
| %% Get a list of vnode pids for a node | ||
| vnode_pids(Node) -> | ||
| [Pid || {_,Pid,_,_} <- supervisor:which_children({riak_core_vnode_sup, Node})]. | ||
|
|
||
| %% Return a list of active primary partitions, active secondary partitions (to be handed off) | ||
| %% and stopped partitions that should be started | ||
| partitions(Node, Ring) -> | ||
| Owners = riak_core_ring:all_owners(Ring), | ||
| Owned = ordsets:from_list(owned_partitions(Owners, Node)), | ||
| Active = ordsets:from_list(active_partitions(Node)), | ||
| Stopped = ordsets:subtract(Owned, Active), | ||
| Secondary = ordsets:subtract(Active, Owned), | ||
| Primary = ordsets:subtract(Active, Secondary), | ||
| {Primary, Secondary, Stopped}. | ||
|
|
||
| %% Return the list of partitions owned by a node | ||
| owned_partitions(Owners, Node) -> | ||
| [P || {P, Owner} <- Owners, Owner =:= Node]. |