mirror of
https://github.com/valitydev/riak_test.git
synced 2024-11-06 08:35:22 +00:00
290 lines
10 KiB
Erlang
290 lines
10 KiB
Erlang
%% -------------------------------------------------------------------
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%%
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%% Copyright (c) 2013 Basho Technologies, Inc.
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%%
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%% This file is provided to you under the Apache License,
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%% Version 2.0 (the "License"); you may not use this file
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%% except in compliance with the License. You may obtain
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%% a copy of the License at
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%%
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%% http://www.apache.org/licenses/LICENSE-2.0
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%%
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%% Unless required by applicable law or agreed to in writing,
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%% software distributed under the License is distributed on an
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%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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%% KIND, either express or implied. See the License for the
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%% specific language governing permissions and limitations
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%% under the License.
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%%
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%% -------------------------------------------------------------------
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-module(overload).
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-compile(export_all).
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-include_lib("eunit/include/eunit.hrl").
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-define(NUM_REQUESTS, 200).
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-define(THRESHOLD, 100).
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-define(BUCKET, <<"test">>).
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-define(KEY, <<"hotkey">>).
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confirm() ->
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Config = [{riak_core, [{ring_creation_size, 8},
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{enable_health_checks, false},
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{vnode_overload_threshold, undefined}]},
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{riak_kv, [{fsm_limit, undefined},
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{storage_backend, riak_kv_memory_backend},
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{anti_entropy, {off, []}}]}],
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Nodes = rt:build_cluster(2, Config),
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[_Node1, Node2] = Nodes,
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Ring = rt:get_ring(Node2),
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Hash = riak_core_util:chash_std_keyfun({?BUCKET, ?KEY}),
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PL = lists:sublist(riak_core_ring:preflist(Hash, Ring), 3),
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Victim = hd([Idx || {Idx, Node} <- PL,
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Node =:= Node2]),
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RO = riak_object:new(?BUCKET, ?KEY, <<"test">>),
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ok = test_no_overload_protection(Nodes, Victim, RO),
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ok = test_vnode_protection(Nodes, Victim, RO),
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ok = test_fsm_protection(Nodes, Victim, RO),
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pass.
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test_no_overload_protection(Nodes, Victim, RO) ->
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lager:info("Testing with no overload protection"),
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{NumProcs, QueueLen} = run_test(Nodes, Victim, RO),
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?assert(NumProcs >= (2*?NUM_REQUESTS * 0.9)),
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?assert(QueueLen >= (?NUM_REQUESTS * 0.9)),
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ok.
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test_vnode_protection(Nodes, Victim, RO) ->
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[Node1, Node2] = Nodes,
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%% Setting check_interval to one ensures that process_info is called
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%% to check the queue length on each vnode send.
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%% This allows us to artificially raise vnode queue lengths with dummy
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%% messages instead of having to go through the vnode path for coverage
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%% query overload testing.
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lager:info("Testing with vnode queue protection enabled"),
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lager:info("Setting vnode overload threshold to ~b", [?THRESHOLD]),
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lager:info("Setting vnode check interval to 1"),
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Config2 = [{riak_core, [{vnode_overload_threshold, ?THRESHOLD},
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{vnode_check_interval, 1}]}],
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rt:pmap(fun(Node) ->
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rt:update_app_config(Node, Config2)
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end, Nodes),
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{NumProcs2, QueueLen2} = run_test(Nodes, Victim, RO),
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?assert(NumProcs2 =< (2*?THRESHOLD * 1.5)),
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?assert(QueueLen2 =< (?THRESHOLD * 1.1)),
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%% This stats check often fails. Manual testing shows stats
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%% always incrementing properly. Plus, if I add code to Riak
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%% to log when the dropped stat is incremented I see it called
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%% the correct number of times. This looks like a stats bug
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%% that is outside the scope of this test. Punting for now.
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%%
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%% ShouldDrop = ?NUM_REQUESTS - ?THRESHOLD,
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%% ok = rt:wait_until(Node2, fun(Node) ->
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%% dropped_stat(Node) =:= ShouldDrop
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%% end),
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CheckInterval = ?THRESHOLD div 2,
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Dropped = read_until_success(Node1),
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lager:info("Unnecessary dropped requests: ~b", [Dropped]),
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?assert(Dropped =< CheckInterval),
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test_cover_queries_overload(Nodes),
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lager:info("Suspending vnode proxy for ~b", [Victim]),
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Pid = suspend_vnode_proxy(Node2, Victim),
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{NumProcs3, QueueLen3} = run_test(Nodes, Victim, RO),
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Pid ! resume,
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?assert(NumProcs3 >= (2*?NUM_REQUESTS * 0.9)),
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?assert(QueueLen3 =< (?THRESHOLD * 1.1)),
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ok.
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test_fsm_protection(Nodes, Victim, RO) ->
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lager:info("Testing with coordinator protection enabled"),
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lager:info("Setting FSM limit to ~b", [?THRESHOLD]),
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Config3 = [{riak_kv, [{fsm_limit, ?THRESHOLD}]}],
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rt:pmap(fun(Node) ->
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rt:update_app_config(Node, Config3)
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end, Nodes),
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{NumProcs4, QueueLen4} = run_test(Nodes, Victim, RO),
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?assert(NumProcs4 =< (?THRESHOLD * 1.1)),
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?assert(QueueLen4 =< (?THRESHOLD * 1.1)),
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ok.
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run_test(Nodes, Victim, RO) ->
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[Node1, Node2] = Nodes,
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rt:wait_for_cluster_service(Nodes, riak_kv),
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lager:info("Sleeping for 10s to let process count stablize"),
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timer:sleep(10000),
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rt:load_modules_on_nodes([?MODULE], Nodes),
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lager:info("Suspending vnode ~p/~p", [Node2, Victim]),
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Suspended = suspend_vnode(Node2, Victim),
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NumProcs1 = process_count(Node1),
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lager:info("Initial process count on ~p: ~b", [Node1, NumProcs1]),
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lager:info("Sending ~b read requests", [?NUM_REQUESTS]),
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write_once(Node1, RO),
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Reads = spawn_reads(Node1, ?NUM_REQUESTS),
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timer:sleep(5000),
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NumProcs2 = process_count(Node1),
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QueueLen = vnode_queue_len(Node2, Victim),
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lager:info("Final process count on ~p: ~b", [Node1, NumProcs2]),
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lager:info("Final vnode queue length: ~b", [QueueLen]),
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resume_vnode(Suspended),
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rt:wait_until(Node2, fun(Node) ->
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vnode_queue_len(Node, Victim) =:= 0
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end),
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kill_pids(Reads),
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{NumProcs2 - NumProcs1, QueueLen}.
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test_cover_queries_overload(Nodes) ->
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[Node1, Node2] = Nodes,
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lager:info("Suspending all kv vnodes on Node2"),
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Pid = suspend_and_overload_all_kv_vnodes(Node2),
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lager:info("Checking Coverage queries for overload"),
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Res = list_keys(Node1),
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?assertEqual({error, <<"mailbox_overload">>}, Res),
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lager:info("list_keys correctly handled overload"),
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Res2 = list_buckets(Node1),
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?assertEqual({error, mailbox_overload}, Res2),
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lager:info("list_buckets correctly handled overload"),
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lager:info("Resuming all kv vnodes on Node2"),
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resume_all_vnodes(Pid),
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lager:info("Waiting for vnode queues to empty"),
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wait_for_all_vnode_queues_empty(Node2).
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list_keys(Node) ->
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Pid = rt:pbc(Node),
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riakc_pb_socket:list_keys(Pid, ?BUCKET, 30000).
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list_buckets(Node) ->
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{ok, C} = riak:client_connect(Node),
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riak_client:list_buckets(30000, C).
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wait_for_all_vnode_queues_empty(Node) ->
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rt:wait_until(Node, fun(N) ->
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vnode_queues_empty(N)
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end).
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vnode_queues_empty(Node) ->
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rpc:call(Node, ?MODULE, remote_vnode_queues_empty, []).
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remote_vnode_queues_empty() ->
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lists:all(fun({_, _, Pid}) ->
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{message_queue_len, Len} =
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process_info(Pid, message_queue_len),
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Len =:= 0
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end, riak_core_vnode_manager:all_vnodes()).
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write_once(Node, RO) ->
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{ok, C} = riak:client_connect(Node),
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C:put(RO, 3).
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read_until_success(Node) ->
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{ok, C} = riak:client_connect(Node),
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read_until_success(C, 0).
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read_until_success(C, Count) ->
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case C:get(?BUCKET, ?KEY) of
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{error, mailbox_overload} ->
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read_until_success(C, Count+1);
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_ ->
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Count
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end.
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spawn_reads(Node, Num) ->
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[spawn(fun() ->
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{ok, C} = riak:client_connect(Node),
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riak_client:get(?BUCKET, ?KEY, C)
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end) || _ <- lists:seq(1,Num)].
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kill_pids(Pids) ->
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[exit(Pid, kill) || Pid <- Pids].
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suspend_and_overload_all_kv_vnodes(Node) ->
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Pid = rpc:call(Node, ?MODULE, remote_suspend_and_overload, []),
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Pid ! {overload, self()},
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receive overloaded ->
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Pid
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end.
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remote_suspend_and_overload() ->
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spawn(fun() ->
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Vnodes = riak_core_vnode_manager:all_vnodes(),
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[erlang:suspend_process(Pid, []) || {riak_kv_vnode, _, Pid}
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<- Vnodes],
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receive {overload, From} ->
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io:format("Overloading vnodes ~n"),
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[?MODULE:overload(Pid) || {riak_kv_vnode, _, Pid}
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<- Vnodes],
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From ! overloaded
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end,
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receive resume ->
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io:format("Resuming vnodes~n"),
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[erlang:resume_process(Pid) || {riak_kv_vnode, _, Pid}
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<- Vnodes]
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end
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end).
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overload(Pid) ->
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%% The actual message doesn't matter. This one just has the least side
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% effects.
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[Pid ! {set_concurrency_limit, some_lock, 1} || _ <- lists:seq(1, ?NUM_REQUESTS)].
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suspend_vnode(Node, Idx) ->
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Pid = rpc:call(Node, ?MODULE, remote_suspend_vnode, [Idx], infinity),
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Pid.
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remote_suspend_vnode(Idx) ->
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spawn(fun() ->
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{ok, Pid} = riak_core_vnode_manager:get_vnode_pid(Idx, riak_kv_vnode),
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erlang:suspend_process(Pid, []),
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receive resume ->
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erlang:resume_process(Pid)
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end
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end).
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suspend_vnode_proxy(Node, Idx) ->
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Pid = rpc:call(Node, ?MODULE, remote_suspend_vnode_proxy, [Idx], infinity),
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Pid.
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remote_suspend_vnode_proxy(Idx) ->
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spawn(fun() ->
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Name = riak_core_vnode_proxy:reg_name(riak_kv_vnode, Idx),
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Pid = whereis(Name),
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erlang:suspend_process(Pid, []),
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receive resume ->
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erlang:resume_process(Pid)
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end
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end).
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resume_all_vnodes(Pid) ->
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Pid ! resume.
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resume_vnode(Pid) ->
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Pid ! resume.
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process_count(Node) ->
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rpc:call(Node, erlang, system_info, [process_count]).
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vnode_queue_len(Node, Idx) ->
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rpc:call(Node, ?MODULE, remote_vnode_queue, [Idx]).
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dropped_stat(Node) ->
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Stats = rpc:call(Node, riak_core_stat, get_stats, []),
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proplists:get_value(dropped_vnode_requests_total, Stats).
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remote_vnode_queue(Idx) ->
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{ok, Pid} = riak_core_vnode_manager:get_vnode_pid(Idx, riak_kv_vnode),
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{message_queue_len, Len} = process_info(Pid, message_queue_len),
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Len.
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