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riak_kv_entropy_manager.erl
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%% -------------------------------------------------------------------
%%
%% Copyright (c) 2012 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_kv_entropy_manager).
-behaviour(gen_server).
%% API
-export([start_link/0,
manual_exchange/1,
enabled/0,
enable/0,
disable/0,
set_mode/1,
set_debug/1,
cancel_exchange/1,
cancel_exchanges/0,
get_lock/1,
get_lock/2,
get_lock/3,
release_lock/1,
requeue_poke/1,
start_exchange_remote/3,
start_exchange_remote/4,
exchange_status/4,
maybe_add_sweep_participant/0,
expire_trees/0,
clear_trees/0,
get_version/0,
get_partition_version/1,
get_pending_version/0,
get_upgraded/0,
get_trees_version/0]).
-export([all_pairwise_exchanges/2]).
-export([throttle/0,
get_aae_throttle/0,
set_aae_throttle/1,
is_aae_throttle_enabled/0,
disable_aae_throttle/0,
enable_aae_throttle/0,
get_aae_throttle_limits/0,
set_aae_throttle_limits/1,
get_max_local_vnodeq/0]).
-export([multicall/5]). % for meck twiddle-testing
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-ifdef(TEST).
-export([query_and_set_aae_throttle/1, do_get_lock/4]). % for eunit twiddle-testing
-export([make_state/0, get_last_throttle/1]). % for eunit twiddle-testing
-include_lib("eunit/include/eunit.hrl").
-endif.
-type index() :: non_neg_integer().
-type index_n() :: {index(), pos_integer()}.
-type vnode() :: {index(), node()}.
-type exchange() :: {index(), index(), index_n()}.
-type riak_core_ring() :: riak_core_ring:riak_core_ring().
-type version() :: legacy | non_neg_integer().
-type orddict(Key, Val) :: [{Key, Val}].
-record(lock, {pid :: pid(),
ref :: reference(),
index :: non_neg_integer(),
type :: atom()
}).
-record(state, {mode = automatic :: automatic | manual,
trees = [] :: orddict(index(), pid()),
tree_queue = [] :: orddict(index(), pid()),
trees_version = [] :: orddict(index(), version()),
locks = [] :: [#lock{}],
exchange_queue = [] :: [exchange()],
exchanges = [] :: [{index(), reference(), pid()}],
vnode_status_pid = undefined :: 'undefined' | pid(),
last_throttle = undefined :: 'undefined' | non_neg_integer(),
version = legacy :: version(),
pending_version = legacy :: version()
}).
-type state() :: #state{}.
-define(DEFAULT_CONCURRENCY, 2).
-define(DEFAULT_BUILD_CONCURRENCY, 1).
-define(KV_ENTROPY_LOCK_TIMEOUT, app_helper:get_env(riak_kv, anti_entropy_lock_timeout, 10000)).
-define(AAE_THROTTLE_KEY, aae_throttle).
-define(DEFAULT_AAE_THROTTLE_LIMITS,
[{-1,0}, {200,10}, {500,50}, {750,250}, {900,1000}, {1100,5000}]).
-define(ETS, entropy_manager_ets).
%%%===================================================================
%%% API
%%%===================================================================
-spec start_link() -> {ok, pid()} | {error, term()}.
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
%% @doc Acquire an exchange concurrency lock if available, and associate
%% the lock with the calling process.
-spec get_lock(any()) -> ok | max_concurrency.
get_lock(Type) ->
get_lock(Type, self()).
%% @doc Acquire an exchange concurrency lock if available, and associate
%% the lock with the provided pid.
-spec get_lock(any(), pid()) -> ok | max_concurrency.
get_lock(Type, Pid) ->
get_lock(Type, Pid, undefined).
-spec get_lock(any(), pid(), index() | undefined) -> ok | max_concurrency.
get_lock(Type, Pid, Index) ->
gen_server:call(?MODULE, {get_lock, Type, Pid, Index}, ?KV_ENTROPY_LOCK_TIMEOUT).
-spec release_lock(pid() | non_neg_integer()) -> ok.
release_lock(Index) when is_integer(Index) ->
gen_server:call(?MODULE, {release_lock, Index}, infinity);
release_lock(Pid) when is_pid(Pid) ->
gen_server:cast(?MODULE, {release_lock, Pid}).
%% @doc Acquire the necessary locks for an entropy exchange with the specified
%% remote vnode. The request is sent to the remote entropy manager which
%% will try to acquire a concurrency lock. If successful, the request is
%% then forwarded to the relevant index_hashtree to acquire a tree lock.
%% If both locks are acquired, the pid of the remote index_hashtree is
%% returned. This function assumes a legacy version of the hashtree
%% and is left over for support for mixed clusters with pre-2.2 nodes
-spec start_exchange_remote({index(), node()}, index_n(), pid())
-> {remote_exchange, pid()} |
{remote_exchange, anti_entropy_disabled} |
{remote_exchange, max_concurrency} |
{remote_exchange, not_built} |
{remote_exchange, already_locked} |
{remote_exchange, bad_version}.
start_exchange_remote(VNode, IndexN, FsmPid) ->
start_exchange_remote(VNode, IndexN, FsmPid, legacy).
-spec start_exchange_remote({index(), node()}, index_n(), pid(), version())
-> {remote_exchange, pid()} |
{remote_exchange, anti_entropy_disabled} |
{remote_exchange, max_concurrency} |
{remote_exchange, not_built} |
{remote_exchange, already_locked} |
{remote_exchange, bad_version}.
start_exchange_remote(_VNode={Index, Node}, IndexN, FsmPid, legacy) ->
gen_server:call({?MODULE, Node},
{start_exchange_remote, FsmPid, Index, IndexN},
infinity);
start_exchange_remote(_VNode={Index, Node}, IndexN, FsmPid, Version) ->
gen_server:call({?MODULE, Node},
{start_exchange_remote, FsmPid, Index, IndexN, Version},
infinity).
%% @doc Used by {@link riak_kv_index_hashtree} to requeue a poke on
%% build failure.
-spec requeue_poke(index()) -> ok.
requeue_poke(Index) ->
gen_server:cast(?MODULE, {requeue_poke, Index}).
%% @doc Used by {@link riak_kv_exchange_fsm} to inform the entropy
%% manager about the status of an exchange (ie. completed without
%% issue, failed, etc)
-spec exchange_status(vnode(), vnode(), index_n(), any()) -> ok.
exchange_status(LocalVN, RemoteVN, IndexN, Reply) ->
gen_server:cast(?MODULE,
{exchange_status,
self(), LocalVN, RemoteVN, IndexN, Reply}).
%% @doc Returns true of AAE is enabled, false otherwise.
-spec enabled() -> boolean().
enabled() ->
{Enabled, _} = settings(),
Enabled.
%% @doc Set AAE to either `automatic' or `manual' mode. In automatic mode, the
%% entropy manager triggers all necessary hashtree exchanges. In manual
%% mode, exchanges must be triggered using {@link manual_exchange/1}.
%% Regardless of exchange mode, the entropy manager will always ensure
%% local hashtrees are built and rebuilt as necessary.
-spec set_mode(automatic | manual) -> ok.
set_mode(Mode=automatic) ->
ok = gen_server:call(?MODULE, {set_mode, Mode}, infinity);
set_mode(Mode=manual) ->
ok = gen_server:call(?MODULE, {set_mode, Mode}, infinity).
%% @doc Toggle debug mode, which prints verbose AAE information to the console.
-spec set_debug(boolean()) -> ok.
set_debug(Enabled) ->
Modules = [riak_kv_index_hashtree,
riak_kv_entropy_manager,
riak_kv_exchange_fsm],
case Enabled of
true ->
[lager:trace_console([{module, Mod}]) || Mod <- Modules];
false ->
[begin
{ok, Trace} = lager:trace_console([{module, Mod}]),
lager:stop_trace(Trace)
end || Mod <- Modules]
end,
ok.
-spec enable() -> ok.
enable() ->
gen_server:call(?MODULE, enable, infinity).
-spec disable() -> ok.
disable() ->
gen_server:call(?MODULE, disable, infinity).
maybe_add_sweep_participant() ->
case enabled() of
true ->
add_sweep_participant();
_ ->
ok
end.
add_sweep_participant() ->
%% Expire time in ms run interval in s
RunInterval = fun() -> riak_kv_index_hashtree:get_expire_time() / 1000 end,
riak_kv_sweeper:add_sweep_participant(_Description = "KV AAE tree rebuild",
_Module = riak_kv_index_hashtree,
_FunType = observe_fun,
RunInterval,
_Options = [bucket_props]).
remove_sweep_participant() ->
riak_kv_sweeper:remove_sweep_participant(riak_kv_index_hashtree).
-spec expire_trees() -> ok.
expire_trees() ->
gen_server:cast(?MODULE, expire_trees).
-spec clear_trees() -> ok.
clear_trees() ->
gen_server:cast(?MODULE, clear_trees).
-spec get_version() -> version().
get_version() ->
case ets:lookup(?ETS, version) of
[] ->
legacy;
[{version, Version}] ->
Version
end.
-spec get_partition_version(index()) -> version().
get_partition_version(Index) ->
case ets:lookup(?ETS, Index) of
[] ->
legacy;
[{Index, Version}] ->
Version
end.
-spec get_pending_version() -> version().
get_pending_version() ->
case ets:lookup(?ETS, pending_version) of
[] ->
legacy;
[{pending_version, Version}] ->
Version
end.
-spec get_upgraded() -> boolean().
get_upgraded() ->
case {get_version(), get_pending_version()} of
{legacy, legacy} ->
false;
_ ->
true
end.
%% For testing to quickly verify tree versions match up with manager version
-spec get_trees_version() -> [{index(), version()}].
get_trees_version() ->
gen_server:call(?MODULE, get_trees_version, infinity).
%% @doc Manually trigger hashtree exchanges.
%% -- If an index is provided, trigger exchanges between the index and all
%% sibling indices for all index_n.
%% -- If both an index and index_n are provided, trigger exchanges between
%% the index and all sibling indices associated with the specified
%% index_n.
%% -- If an index, remote index, and index_n are provided, trigger an
%% exchange between the index and remote index for the specified
%% index_n.
-spec manual_exchange(index() |
{index(), index_n()} |
{index(), index(), index_n()}) -> ok.
manual_exchange(Exchange) ->
gen_server:call(?MODULE, {manual_exchange, Exchange}, infinity).
-spec cancel_exchange(index()) -> ok | undefined.
cancel_exchange(Index) ->
gen_server:call(?MODULE, {cancel_exchange, Index}, infinity).
-spec cancel_exchanges() -> [index()].
cancel_exchanges() ->
gen_server:call(?MODULE, cancel_exchanges, infinity).
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
-spec init([]) -> {'ok',state()}.
init([]) ->
register_capabilities(),
riak_core_throttle:init(riak_kv,
?AAE_THROTTLE_KEY,
{aae_throttle_limits, ?DEFAULT_AAE_THROTTLE_LIMITS},
{aae_throttle_enabled, true}),
?ETS = ets:new(?ETS, [named_table, {read_concurrency, true}]),
schedule_tick(),
{_, Opts} = settings(),
Mode = case proplists:is_defined(manual, Opts) of
true ->
manual;
false ->
automatic
end,
set_debug(proplists:is_defined(debug, Opts)),
State = #state{mode=Mode,
trees=[],
tree_queue=[],
locks=[],
exchanges=[],
exchange_queue=[]},
maybe_add_sweep_participant(),
{ok, State}.
register_capabilities() ->
riak_core_capability:register({riak_kv, object_hash_version},
[0, legacy],
legacy),
riak_core_capability:register({riak_kv, anti_entropy},
[enabled_v1, disabled],
disabled).
handle_call({set_mode, Mode}, _From, State=#state{mode=CurrentMode}) ->
State2 = case {CurrentMode, Mode} of
{automatic, manual} ->
%% Clear exchange queue when switching to manual mode
State#state{exchange_queue=[]};
_ ->
State
end,
{reply, ok, State2#state{mode=Mode}};
handle_call({manual_exchange, Exchange}, _From, State) ->
State2 = enqueue_exchange(Exchange, State),
{reply, ok, State2};
handle_call(enable, _From, State) ->
{_, Opts} = settings(),
application:set_env(riak_kv, anti_entropy, {on, Opts}),
maybe_add_sweep_participant(),
{reply, ok, State};
handle_call(disable, _From, State) ->
{_, Opts} = settings(),
remove_sweep_participant(),
application:set_env(riak_kv, anti_entropy, {off, Opts}),
_ = [riak_kv_index_hashtree:stop(T) || {_,T} <- State#state.trees],
{reply, ok, State};
handle_call({get_lock, Type, Pid, Index}, _From, State) ->
{Reply, State2} = do_get_lock(Type, Pid, Index, State),
{reply, Reply, State2};
handle_call({release_lock, Index}, _From, State) ->
State2 = maybe_release_lock(Index, State),
{reply, ok, State2};
handle_call(get_version, _From, State=#state{version=Version}) ->
{reply, Version, State};
handle_call(get_pending_version, _From, State=#state{pending_version=Version}) ->
{reply, Version, State};
handle_call(get_trees_version, _From, State=#state{trees=Trees}) ->
VTrees = [{Idx, riak_kv_index_hashtree:get_version(Pid)} || {Idx, Pid} <- Trees],
{reply, VTrees, State};
%% To support compatibility with pre 2.2 nodes.
handle_call({start_exchange_remote, FsmPid, Index, IndexN}, From, State) ->
do_start_exchange_remote(FsmPid, Index, IndexN, legacy, From, State);
handle_call({start_exchange_remote, FsmPid, Index, IndexN, Version}, From, State) ->
do_start_exchange_remote(FsmPid, Index, IndexN, Version, From, State);
handle_call({cancel_exchange, Index}, _From, State) ->
case lists:keyfind(Index, 1, State#state.exchanges) of
false ->
{reply, undefined, State};
{Index, _Ref, Pid} ->
exit(Pid, kill),
{reply, ok, State}
end;
handle_call(cancel_exchanges, _From, State=#state{exchanges=Exchanges}) ->
Indices = [begin
exit(Pid, kill),
Index
end || {Index, _Ref, Pid} <- Exchanges],
{reply, Indices, State};
handle_call(_Request, _From, State) ->
{reply, ok, State}.
handle_cast({release_lock, Pid}, S) ->
S2 = maybe_release_lock(Pid, S),
{noreply, S2};
handle_cast({requeue_poke, Index}, State) ->
State2 = requeue_poke(Index, State),
{noreply, State2};
handle_cast({exchange_status, Pid, LocalVN, RemoteVN, IndexN, Reply}, State) ->
State2 = do_exchange_status(Pid, LocalVN, RemoteVN, IndexN, Reply, State),
{noreply, State2};
handle_cast(clear_trees, S) ->
clear_all_exchanges(S#state.exchanges),
clear_all_trees(S#state.trees),
{noreply, S};
handle_cast(expire_trees, S) ->
ok = expire_all_trees(S#state.trees),
{noreply, S};
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info(tick, State) ->
State1 = maybe_tick(State),
{noreply, State1};
handle_info({{hashtree_pid, Index}, Reply}, State) ->
case Reply of
{ok, Pid} when is_pid(Pid) ->
State2 = add_hashtree_pid(Index, Pid, State),
{noreply, State2};
_ ->
{noreply, State}
end;
handle_info({'DOWN', _, _, Pid, Status}, #state{vnode_status_pid=Pid}=State) ->
case Status of
{result, _} = RES ->
State2 = query_and_set_aae_throttle3(RES, State#state{vnode_status_pid=undefined}),
{noreply, State2};
Else ->
lager:error("query_and_set_aae_throttle error: ~p",[Else]),
{noreply, State}
end;
handle_info({'DOWN', Ref, _, Obj, Status}, State) ->
State2 = maybe_release_lock(Ref, State),
State3 = maybe_clear_exchange(Ref, Status, State2),
State4 = maybe_clear_registered_tree(Obj, State3),
{noreply, State4};
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
clear_all_exchanges(Exchanges) ->
[begin
exit(Pid, kill),
Index
end || {Index, _Ref, Pid} <- Exchanges].
clear_all_trees(Trees) ->
[riak_kv_index_hashtree:clear(TPid) || {_, TPid} <- Trees].
expire_all_trees(Trees) ->
_ = [riak_kv_index_hashtree:expire(TPid) || {_, TPid} <- Trees],
ok.
-spec settings() -> {boolean(), proplists:proplist()}.
settings() ->
case app_helper:get_env(riak_kv, anti_entropy, {off, []}) of
{on, Opts} ->
{true, Opts};
{off, Opts} ->
{false, Opts};
X ->
lager:warning("Invalid setting for riak_kv/anti_entropy: ~p", [X]),
application:set_env(riak_kv, anti_entropy, {off, []}),
{false, []}
end.
-spec maybe_reload_hashtrees(riak_core_ring(), state()) -> state().
maybe_reload_hashtrees(Ring, State) ->
case lists:member(riak_kv, riak_core_node_watcher:services(node())) of
true ->
reload_hashtrees(Ring, State);
false ->
State
end.
%% Determine the index_hashtree pid for each running primary vnode. This
%% function is called each tick to ensure that any newly spawned vnodes are
%% queried.
-spec reload_hashtrees(riak_core_ring(), state()) -> state().
reload_hashtrees(Ring, State=#state{trees=Trees}) ->
Indices = riak_core_ring:my_indices(Ring),
Existing = dict:from_list(Trees),
MissingIdx = [Idx || Idx <- Indices,
not dict:is_key(Idx, Existing)],
_ = [riak_kv_vnode:request_hashtree_pid(Idx) || Idx <- MissingIdx],
State.
add_hashtree_pid(Index, Pid, State) ->
add_hashtree_pid(enabled(), Index, Pid, State).
add_hashtree_pid(false, _Index, Pid, State) ->
riak_kv_index_hashtree:stop(Pid),
State;
add_hashtree_pid(true, Index, Pid, State=#state{trees=Trees, trees_version=VTrees}) ->
case orddict:find(Index, Trees) of
{ok, Pid} ->
%% Already know about this hashtree
State;
_ ->
monitor(process, Pid),
Version = riak_kv_index_hashtree:get_version(Pid),
Trees2 = orddict:store(Index, Pid, Trees),
VTrees2 = orddict:store(Index, Version, VTrees),
ets:insert(?ETS, {Index, Version}),
State2 = State#state{trees=Trees2, trees_version=VTrees2},
State3 = add_index_exchanges(Index, State2),
State4 = check_upgrade(State3),
State4
end.
-spec do_get_lock(any(),pid(), non_neg_integer(), state())
-> {ok | max_concurrency | build_limit_reached, state()}.
do_get_lock(Type, Pid, Index, State=#state{locks=Locks}) ->
Concurrency = app_helper:get_env(riak_kv,
anti_entropy_concurrency,
?DEFAULT_CONCURRENCY),
case length(Locks) >= Concurrency of
true ->
{max_concurrency, State};
false ->
case check_lock_type(Type, Locks) of
ok ->
Ref = monitor(process, Pid),
NewLock = #lock{pid = Pid, ref = Ref, index = Index, type = Type},
State2 = State#state{locks=[NewLock | Locks]},
{ok, State2};
Error ->
{Error, State}
end
end.
check_lock_type(build, Locks) ->
Limit = app_helper:get_env(riak_kv, anti_entropy_build_concurrency, ?DEFAULT_BUILD_CONCURRENCY),
NumLocks = get_nr_of_locks(build, Locks) + get_nr_of_locks(upgrade, Locks),
case NumLocks >= Limit of
true ->
build_limit_reached;
false ->
ok
end;
check_lock_type(_Type, _Locks) ->
ok.
get_nr_of_locks(Type, Locks) ->
Pred = fun(Lock) -> Lock#lock.type =:= Type end,
riak_core_util:count(Pred, Locks).
-spec do_start_exchange_remote(pid(), index(), index_n(), version(), term(), state())
-> {reply, term(), state()} | {noreply, state()}.
do_start_exchange_remote(FsmPid, Index, IndexN, Version, From, State) ->
Enabled = enabled(),
TreeResult = orddict:find(Index, State#state.trees),
maybe_start_exchange_remote(Enabled, TreeResult, FsmPid, Index, IndexN, Version, From, State).
-spec maybe_start_exchange_remote(Enabled::boolean(),
TreeResult::{ok, term()} | error,
FsmPid::pid(),
Index::index(),
IndexN::index_n(),
Version::version(),
From::term(),
State::state()) ->
{noreply, state()} | {reply, term(), state()}.
maybe_start_exchange_remote(false, _, _FsmPid, _Index, _IndexN, _Version, _From, State) ->
{reply, {remote_exchange, anti_entropy_disabled}, State};
maybe_start_exchange_remote(_, error, _FsmPid, _Index, _IndexN, _Version, _From, State) ->
{reply, {remote_exchange, not_built}, State};
maybe_start_exchange_remote(true, {ok, Tree}, FsmPid, Index, IndexN, Version, From, State) ->
case do_get_lock(exchange_remote, FsmPid, Index, State) of
{ok, State2} ->
%% Concurrency lock acquired, now forward to index_hashtree
%% to acquire tree lock.
riak_kv_index_hashtree:start_exchange_remote(FsmPid, Version, From, IndexN, Tree),
{noreply, State2};
{Reply, State2} ->
{reply, {remote_exchange, Reply}, State2}
end.
-spec maybe_release_lock(reference() |non_neg_integer(), state()) -> state().
maybe_release_lock(Ref, State) when is_reference(Ref) ->
Locks = lists:keydelete(Ref, #lock.ref, State#state.locks),
State#state{locks=Locks};
maybe_release_lock(Index, State) when is_number(Index) ->
Locks = lists:keydelete(Index, #lock.index, State#state.locks),
State#state{locks=Locks}.
-spec maybe_clear_exchange(reference(), term(), state()) -> state().
maybe_clear_exchange(Ref, Status, State) ->
case lists:keytake(Ref, 2, State#state.exchanges) of
false ->
State;
{value, {Idx,Ref,_Pid}, Exchanges} ->
lager:debug("Untracking exchange: ~p :: ~p", [Idx, Status]),
State#state{exchanges=Exchanges}
end.
-spec maybe_clear_registered_tree(pid(), state()) -> state().
maybe_clear_registered_tree(Pid, State) when is_pid(Pid) ->
case lists:keytake(Pid, 2, State#state.trees) of
false ->
State;
{value, {Index, Pid}, Trees} ->
ets:delete(?ETS, Index),
VTrees = orddict:erase(Index, State#state.trees_version),
State#state{trees=Trees, trees_version=VTrees}
end;
maybe_clear_registered_tree(_, State) ->
State.
-spec next_tree(state()) -> {pid(), state()}.
next_tree(#state{trees=[]}) ->
throw(no_trees_registered);
next_tree(State=#state{tree_queue=[], trees=Trees}) ->
State2 = State#state{tree_queue=Trees},
next_tree(State2);
next_tree(State=#state{tree_queue=Queue}) ->
[{_Index,Pid}|Rest] = Queue,
State2 = State#state{tree_queue=Rest},
{Pid, State2}.
-spec schedule_tick() -> ok.
schedule_tick() ->
%% Perform tick every 15 seconds
DefaultTick = 15000,
Tick = app_helper:get_env(riak_kv,
anti_entropy_tick,
DefaultTick),
erlang:send_after(Tick, ?MODULE, tick),
ok.
-spec maybe_tick(state()) -> state().
maybe_tick(State) ->
case enabled() of
true ->
case riak_core_capability:get({riak_kv, anti_entropy}, disabled) of
disabled ->
NextState = State;
enabled_v1 ->
NextState = tick(State)
end;
false ->
%% Ensure we do not have any running index_hashtrees, which can
%% happen when disabling anti-entropy on a live system.
_ = [riak_kv_index_hashtree:stop(T) || {_,T} <- State#state.trees],
NextState = State
end,
schedule_tick(),
NextState.
-spec tick(state()) -> state().
tick(State) ->
{ok, Ring} = riak_core_ring_manager:get_my_ring(),
State1 = query_and_set_aae_throttle(State),
State2 = maybe_reload_hashtrees(Ring, State1),
State3 = maybe_start_upgrade(Ring, State2),
State4 = lists:foldl(fun(_,S) ->
maybe_poke_tree(S)
end, State3, lists:seq(1,10)),
State5 = maybe_exchange(Ring, State4),
State5.
-spec maybe_poke_tree(state()) -> state().
maybe_poke_tree(State=#state{trees=[]}) ->
State;
maybe_poke_tree(State) ->
{Tree, State2} = next_tree(State),
riak_kv_index_hashtree:poke(Tree),
State2.
-spec maybe_start_upgrade(riak_core_ring(),state()) -> state().
maybe_start_upgrade(Ring, State=#state{trees=Trees, version=legacy, pending_version=legacy}) ->
Indices = riak_core_ring:my_indices(Ring),
case riak_core_capability:get({riak_kv, object_hash_version}, legacy) of
0 when length(Trees) == length(Indices) ->
maybe_upgrade(State);
_ ->
State
end;
maybe_start_upgrade(_Ring, State) ->
State.
-spec maybe_upgrade(state()) -> state().
maybe_upgrade(State=#state{trees_version = []}) ->
%% No hashtrees have registered with the manager, skip upgrade check
State;
maybe_upgrade(State=#state{trees_version = VTrees}) ->
case [Idx || {Idx, legacy} <- VTrees] of
%% Upgrade is done already, set version in state
[] ->
ets:insert(?ETS, {version, 0}),
State#state{version=0};
%% No trees have been upgraded, check version
%% on other nodes to see if we should immediately start upgrade.
%% Otherwise wait for all local and remote exchanges to complete.
Trees when length(Trees) == length(VTrees) ->
check_remote_upgraded(State);
%% Upgrade already started, set pending_version
_ ->
lager:notice("Hashtree upgrade already in-process, setting pending_version to 0"),
ets:insert(?ETS, {pending_version, 0}),
State#state{pending_version=0}
end.
check_remote_upgraded(State) ->
{ok, Ring} = riak_core_ring_manager:get_my_ring(),
Nodes = riak_core_ring:all_members(Ring),
case lists:any(fun do_check_remote_upgraded/1, Nodes) of
true ->
lager:notice("Starting AAE hashtree upgrade"),
ets:insert(?ETS, {pending_version, 0}),
State#state{pending_version=0};
_ ->
check_exchanges_and_upgrade(State, Nodes)
end.
do_check_remote_upgraded(Node) ->
case riak_core_util:safe_rpc(Node, riak_kv_entropy_manager, get_upgraded, [], 10000) of
Result when is_boolean(Result) ->
Result;
{badrpc, _Reason} ->
false;
_ ->
false
end.
-spec check_exchanges_and_upgrade(state(), list()) -> state().
check_exchanges_and_upgrade(State, Nodes) ->
case riak_kv_entropy_info:all_sibling_exchanges_complete() of
true ->
%% Now check nodes who havent reported success in the ETS table
case check_all_remote_exchanges_complete(Nodes) of
true ->
lager:notice("Starting AAE hashtree upgrade"),
ets:insert(?ETS, {pending_version, 0}),
State#state{pending_version=0};
_ ->
State
end;
_ ->
State
end.
-spec check_all_remote_exchanges_complete(list()) -> boolean().
check_all_remote_exchanges_complete(Nodes) ->
lists:all(fun maybe_check_and_record_remote_exchange/1, Nodes).
-spec maybe_check_and_record_remote_exchange(node()) -> boolean().
maybe_check_and_record_remote_exchange(Node) ->
case ets:lookup(?ETS, Node) of
[{Node, true}] ->
true;
_ ->
Result = check_remote_exchange(Node),
ets:insert(?ETS, {Node, Result}),
Result
end.
-spec check_remote_exchange(node()) -> boolean().
check_remote_exchange(Node) ->
case riak_core_util:safe_rpc(Node, riak_kv_entropy_info, all_sibling_exchanges_complete, [], 10000) of
Result when is_boolean(Result) ->
Result;
{badrpc, _Reason} ->
false;
_ ->
false
end.
-spec check_upgrade(state()) -> state().
check_upgrade(State=#state{pending_version=legacy}) ->
State;
check_upgrade(State=#state{pending_version=PendingVersion,trees_version=VTrees}) ->
%% Verify we have all partitions registered with a hashtree, version
{ok, Ring} = riak_core_ring_manager:get_my_ring(),
Indices = riak_core_ring:my_indices(Ring),
MissingIdx = [Idx || Idx <- Indices,
not orddict:is_key(Idx, VTrees)],
case MissingIdx of
[] ->
case [Idx || {Idx, V} <- VTrees, V == PendingVersion] of
[] ->
State;
Trees when length(Trees) == length(VTrees) ->
lager:notice("Local AAE hashtrees have completed upgrade to version: ~p",[PendingVersion]),
ets:insert(?ETS, {version, PendingVersion}),
ets:insert(?ETS, {pending_version, legacy}),
State#state{version=PendingVersion, pending_version=legacy};
_Trees ->
State
end;
_ ->
State
end.
%%%===================================================================
%%% Exchanging
%%%===================================================================
-spec do_exchange_status(pid(), vnode(), vnode(), index_n(), any(), state()) -> state().
do_exchange_status(_Pid, LocalVN, RemoteVN, IndexN, Reply, State) ->
{LocalIdx, _} = LocalVN,
{RemoteIdx, RemoteNode} = RemoteVN,
case Reply of
ok ->
State;
{remote, anti_entropy_disabled} ->
lager:warning("Active anti-entropy is disabled on ~p", [RemoteNode]),
State;
_ ->
State2 = requeue_exchange(LocalIdx, RemoteIdx, IndexN, State),
State2
end.
-spec enqueue_exchange(index() |
{index(), index_n()} |
{index(), index(), index_n()}, state()) -> state().
enqueue_exchange(E={Index, _RemoteIdx, _IndexN}, State) ->
%% Verify that the exchange is valid
{ok, Ring} = riak_core_ring_manager:get_my_ring(),
Exchanges = all_pairwise_exchanges(Index, Ring),
case lists:member(E, Exchanges) of
true ->
enqueue_exchanges([E], State);
false ->
State
end;
enqueue_exchange({Index, IndexN}, State) ->
{ok, Ring} = riak_core_ring_manager:get_my_ring(),
Exchanges = all_pairwise_exchanges(Index, Ring),
Exchanges2 = [Exchange || Exchange={_, _, IdxN} <- Exchanges,
IdxN =:= IndexN],
enqueue_exchanges(Exchanges2, State);
enqueue_exchange(Index, State) ->
{ok, Ring} = riak_core_ring_manager:get_my_ring(),
Exchanges = all_pairwise_exchanges(Index, Ring),
enqueue_exchanges(Exchanges, State).
-spec enqueue_exchanges([exchange()], state()) -> state().
enqueue_exchanges(Exchanges, State) ->
EQ = prune_exchanges(State#state.exchange_queue ++ Exchanges),
State#state{exchange_queue=EQ}.
-spec start_exchange(vnode(),
{index(), index_n()},
riak_core_ring(),
state()) -> {any(), state()}.
start_exchange(LocalVN, {RemoteIdx, IndexN}, Ring, State) ->
%% in rare cases, when the ring is resized, there may be an
%% exchange enqueued for an index that no longer exists. catch
%% the case here and move on
try riak_core_ring:index_owner(Ring, RemoteIdx) of
Owner ->
Nodes = lists:usort([node(), Owner]),
DownNodes = Nodes -- riak_core_node_watcher:nodes(riak_kv),
case DownNodes of
[] ->
RemoteVN = {RemoteIdx, Owner},
start_exchange(LocalVN, RemoteVN, IndexN, Ring, State);
_ ->
{{riak_kv_down, DownNodes}, State}
end
catch
error:{badmatch,_} ->
lager:warning("ignoring exchange to non-existent index: ~p", [RemoteIdx]),
{ok, State}
end.
start_exchange(LocalVN, RemoteVN, IndexN, Ring, State) ->
{LocalIdx, _} = LocalVN,
{RemoteIdx, _} = RemoteVN,
case riak_core_ring:vnode_type(Ring, LocalIdx) of
primary ->
case orddict:find(LocalIdx, State#state.trees) of
error ->
%% The local vnode has not yet registered it's
%% index_hashtree. Likewise, the vnode may not even
%% be running (eg. after a crash). Send request to
%% the vnode to trigger on-demand start and requeue
%% exchange.
riak_kv_vnode:request_hashtree_pid(LocalIdx),
State2 = requeue_exchange(LocalIdx, RemoteIdx, IndexN, State),
{not_built, State2};
{ok, Tree} ->
case riak_kv_exchange_fsm:start(LocalVN, RemoteVN,
IndexN, Tree, self()) of
{ok, FsmPid} ->
Ref = monitor(process, FsmPid),
Exchanges = State#state.exchanges,
Exchanges2 = [{LocalIdx, Ref, FsmPid} | Exchanges],
{ok, State#state{exchanges=Exchanges2}};
{error, Reason} ->
{Reason, State}
end
end;
_ ->
%% No longer owner of this partition or partition is
%% part or larger future ring, ignore exchange
{not_responsible, State}
end.
-spec all_pairwise_exchanges(index(), riak_core_ring())
-> [exchange()].
all_pairwise_exchanges(Index, Ring) ->
LocalIndexN = riak_kv_util:responsible_preflists(Index, Ring),
Sibs = riak_kv_util:preflist_siblings(Index),
lists:flatmap(
fun(RemoteIdx) ->
RemoteIndexN = riak_kv_util:responsible_preflists(RemoteIdx, Ring),
SharedIndexN = ordsets:intersection(ordsets:from_list(LocalIndexN),
ordsets:from_list(RemoteIndexN)),
[{Index, RemoteIdx, IndexN} || IndexN <- SharedIndexN]
end, Sibs).
-spec all_exchanges(node(), riak_core_ring(), state())
-> [exchange()].
all_exchanges(_Node, Ring, #state{trees=Trees}) ->
Indices = orddict:fetch_keys(Trees),
lists:flatmap(fun(Index) ->
all_pairwise_exchanges(Index, Ring)
end, Indices).
-spec add_index_exchanges(index(), state()) -> state().
add_index_exchanges(_Index, State) when State#state.mode == manual ->
State;
add_index_exchanges(Index, State) ->
{ok, Ring} = riak_core_ring_manager:get_my_ring(),
Exchanges = all_pairwise_exchanges(Index, Ring),
EQ = State#state.exchange_queue ++ Exchanges,
EQ2 = prune_exchanges(EQ),
State#state{exchange_queue=EQ2}.
-spec prune_exchanges([exchange()])
-> [exchange()].
prune_exchanges(Exchanges) ->
L = [if A < B ->
{A, B, IndexN};
true ->
{B, A, IndexN}
end || {A, B, IndexN} <- Exchanges],
lists:usort(L).
-spec already_exchanging(index() ,state()) -> boolean().
already_exchanging(Index, #state{exchanges=E}) ->
case lists:keyfind(Index, 1, E) of
false ->
false;
{Index,_,_} ->
true
end.
-spec maybe_exchange(riak_core_ring(), state()) -> state().
maybe_exchange(Ring, State) ->
case next_exchange(Ring, State) of
{none, State2} ->
State2;
{NextExchange, State2} ->
{LocalIdx, RemoteIdx, IndexN} = NextExchange,
case already_exchanging(LocalIdx, State) of
true ->
requeue_exchange(LocalIdx, RemoteIdx, IndexN, State2);