610 lines
23 KiB
Erlang
610 lines
23 KiB
Erlang
%% -------------------------------------------------------------------
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%%
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%% Copyright (c) 2007-2015 Basho Technologies, Inc. All Rights Reserved.
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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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%% EQC single-threaded and concurrent test for file operations and repair
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%% under simulated network partition.
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%% The main purpose is to confirm no dataloss, i.e. every chunk that
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%% has been successfully written (ACK received) by append/write
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%% opration will be read after partition heals.
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%%
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%% All updating -- append, write and trim -- operations are executed
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%% through CR client, not directly by flu1 client, in order to be
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%% end-to-end test (in single chain point of veiw.) There may be churn
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%% for projections by simulated network partition.
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%%
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%% Test steps
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%% 1. Setup single chain.
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%% 2. Execute updating operations and simulated partition (by eqc_statem).
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%% Every updating results are recorded in ETS tables.
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%% 3. When {error, timeout|partition} happens, trigger management tick for
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%% every chain manager process.
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%% 4. After commands are executed, remove patition and wait for the chain
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%% without down nodes nor repairing nodes.
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%% 5. Asserting written results so that each record be read from the
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%% chain and data be the same with written one.
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%% Improvements to-do's
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%% - Use higher concurrency, e.g. 10+
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%% - Random length for binary to write
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%% - Operations other than append, write, trim
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%% - Use checksum instead of binary to save memory
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%% - More variety for partitioning pattern: non-constant failure
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%% - Stop and restart
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%% - Suspend and resume of some erlang processes
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-module(machi_ap_repair_eqc).
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-ifdef(TEST).
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-ifdef(EQC).
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-compile(export_all).
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-include("machi.hrl").
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-include("machi_projection.hrl").
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-include("machi_verbose.hrl").
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-include_lib("eqc/include/eqc.hrl").
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-include_lib("eqc/include/eqc_statem.hrl").
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-include_lib("eunit/include/eunit.hrl").
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-record(target, {verbose=false,
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flu_names,
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mgr_names}).
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-record(state, {num,
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verbose=false,
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flu_names,
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mgr_names,
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cr_count}).
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%% ETS table names
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-define(WRITTEN_TAB, written). % Successfully written data
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-define(ACCPT_TAB, accpt). % Errors with no harm, e.g. timeout
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-define(FAILED_TAB, failed). % Uncategorized errors, when happenes
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% it should be re-categorized to accept or critical
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-define(CRITICAL_TAB, critical). % Critical errors, e.g. double write to the same key
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-define(QC_OUT(P),
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eqc:on_output(fun(Str, Args) -> io:format(user, Str, Args) end, P)).
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%% EUNIT TEST DEFINITION
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prop_repair_test_() ->
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{PropTO, EUnitTO} = eqc_timeout(60),
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Verbose = eqc_verbose(),
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{spawn,
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[{timeout, EUnitTO,
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?_assertEqual(
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true,
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eqc:quickcheck(eqc:testing_time(
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PropTO, ?QC_OUT(noshrink(prop_repair(Verbose))))))}]}.
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prop_repair_par_test_() ->
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{PropTO, EUnitTO} = eqc_timeout(60),
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Verbose = eqc_verbose(),
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{spawn,
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[{timeout, EUnitTO,
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?_assertEqual(
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true,
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eqc:quickcheck(eqc:testing_time(
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PropTO, ?QC_OUT(noshrink(prop_repair_par(Verbose))))))}]}.
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%% Model
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weight(_S, change_partition) -> 20;
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weight(_S, _) -> 100.
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%% Append
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append_args(#state{cr_count=CRCount}=S) ->
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[choose(1, CRCount), chunk(), S].
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append(CRIndex, Bin, #state{verbose=V}=S) ->
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CRList = cr_list(),
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{_SimSelfName, C} = lists:nth(CRIndex, CRList),
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Prefix = <<"pre">>,
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Len = byte_size(Bin),
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Res = (catch machi_cr_client:append_chunk(C, Prefix, Bin, {sec(1), sec(1)})),
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case Res of
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{ok, {_Off, Len, _FileName}=Key} ->
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case ets:insert_new(?WRITTEN_TAB, {Key, Bin}) of
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true ->
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[?V("<o>", []) || V],
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ok;
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false ->
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%% The Key is alread written, WHY!!!????
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case ets:lookup(?WRITTEN_TAB, Key) of
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[{Key, Bin}] ->
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%% TODO: The identical binary is alread inserted in
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%% written table. Is this acceptable??? Hmm, maybe NO...
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[?V("<dws:~w>", [Key]) || V],
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true = ets:insert_new(?ACCPT_TAB,
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{make_ref(), double_write_same, Key}),
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{acceptable_error, doublewrite_the_same};
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[{Key, OtherBin}] ->
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[?V("<dwd:~w:~w>", [Key, {OtherBin, Bin}]) || V],
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true = ets:insert_new(?CRITICAL_TAB,
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{make_ref(), double_write_diff, Key}),
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R = {critical_error,
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{doublewrite_diff, Key, {OtherBin, Bin}}},
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%% TODO: when double write happens, it seems that
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%% repair process got stack with endless loop. To
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%% avoit it, return error here.
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%% If this error/1 will be removed, one can possibly
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%% know double write frequency/rate.
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error(R)
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end
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end;
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{error, partition} ->
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[?V("<pt>", []) || V],
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true = ets:insert_new(?ACCPT_TAB, {make_ref(), timeout}),
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_ = tick(S),
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{acceptable_error, partition};
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{'EXIT', {timeout, _}} ->
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[?V("<to:~w:~w>", [_SimSelfName, C]) || V],
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true = ets:insert_new(?ACCPT_TAB, {make_ref(), timeout}),
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_ = tick(S),
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{acceptable_error, timeout};
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{ok, {_Off, UnexpectedLen, _FileName}=Key} ->
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[?V("<XX>", []) || V],
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true = ets:insert_new(?CRITICAL_TAB, {make_ref(), unexpected_len, Key}),
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{critical_error, {unexpected_len, Key, Len, UnexpectedLen}};
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{error, _Reason} = Error ->
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[?V("<er>", []) || V],
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true = ets:insert_new(?FAILED_TAB, {make_ref(), Error}),
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{other_error, Error};
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Other ->
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[?V("<er>", []) || V],
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true = ets:insert_new(?FAILED_TAB, {make_ref(), Other}),
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{other_error, Other}
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end.
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%% Change partition
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change_partition_args(#state{flu_names=FLUNames}=S) ->
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%% [partition(FLUNames), S].
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[partition_sym(FLUNames), S].
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change_partition(Partition,
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#state{verbose=Verbose, flu_names=FLUNames}=S) ->
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[case Partition of
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[] -> ?V("## Turn OFF partition: ~w~n", [Partition]);
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_ -> ?V("## Turn ON partition: ~w~n", [Partition])
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end || Verbose],
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machi_partition_simulator:always_these_partitions(Partition),
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_ = machi_partition_simulator:get(FLUNames),
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%% Don't wait for stable chain, tick will be executed on demand
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%% in append oprations
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_ = tick(S),
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ok.
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%% Generators
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num() ->
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choose(2, 5).
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cr_count(Num) ->
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Num * 3.
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%% Returns a list like
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%% `[{#p_srvr{name=a, port=7501, ..}, "./eqc/data.eqc.a/"}, ...]'
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all_list_extra(Num) ->
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{PortBase, DirBase} = get_port_dir_base(),
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[begin
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FLUNameStr = [$a + I - 1],
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FLUName = list_to_atom(FLUNameStr),
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MgrName = machi_flu_psup:make_mgr_supname(FLUName),
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{#p_srvr{name=FLUName, address="localhost", port=PortBase+I,
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props=[{chmgr, MgrName}]},
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DirBase ++ "/data.eqc." ++ FLUNameStr}
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end || I <- lists:seq(1, Num)].
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sublist(L) ->
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?LET(K, nat(),
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?LET(L2, eqc_gen:vector(K, eqc_gen:oneof(L)),
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lists:usort(L2))).
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%% Generator for possibly assymmetric partition information
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partition(FLUNames) ->
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frequency([{10, return([])},
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{20, non_empty(sublist(flu_ordered_pairs(FLUNames)))}]).
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%% Generator for symmetric partition information
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partition_sym(FLUNames) ->
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?LET(Pairs, non_empty(sublist(flu_pairs(FLUNames))),
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lists:flatmap(fun({One, Another}) -> [{One, Another}, {Another, One}] end,
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Pairs)).
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flu_ordered_pairs(FLUNames) ->
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[{From, To} || From <- FLUNames, To <- FLUNames, From =/= To].
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flu_pairs(FLUNames) ->
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[{One, Another} || One <- FLUNames, Another <- FLUNames, One > Another].
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chunk() ->
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non_empty(binary(10)).
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%% Properties
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prop_repair(Verbose) ->
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error_logger:tty(false),
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application:load(sasl),
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application:set_env(sasl, sasl_error_logger, false),
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Seed = {1445,935441,287549},
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?FORALL(Num, num(),
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?FORALL(Cmds, commands(?MODULE, initial_state(Num, Verbose)),
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begin
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Target = setup_target(Num, Seed, Verbose),
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{H, S1, Res0} = run_commands(?MODULE, Cmds),
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%% ?V("S1=~w~n", [S1]),
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?V("==== Start post operations, stabilize and confirm results~n", []),
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_ = stabilize(commands_len(Cmds), Target),
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{Dataloss, Critical} = confirm_result(Target),
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_ = cleanup(Target),
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pretty_commands(
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?MODULE, Cmds, {H, S1, Res0},
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aggregate(with_title(cmds), command_names(Cmds),
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collect(with_title(length5), (length(Cmds) div 5) * 5,
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{Dataloss, Critical} =:= {0, 0})))
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end)).
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prop_repair_par(Verbose) ->
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error_logger:tty(false),
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application:load(sasl),
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application:set_env(sasl, sasl_error_logger, false),
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Seed = {1445,935441,287549},
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?FORALL(Num, num(),
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?FORALL(Cmds,
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%% Now try-and-err'ing, how to control command length and concurrency?
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?SUCHTHAT(Cmds0, ?SIZED(Size, resize(Size,
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parallel_commands(?MODULE, initial_state(Num, Verbose)))),
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commands_len(Cmds0) > 20
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andalso
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concurrency(Cmds0) > 2),
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begin
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CmdsLen= commands_len(Cmds),
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Target = setup_target(Num, Seed, Verbose),
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{Seq, Par, Res0} = run_parallel_commands(?MODULE, Cmds),
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%% ?V("Seq=~w~n", [Seq]),
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%% ?V("Par=~w~n", [Par]),
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?V("==== Start post operations, stabilize and confirm results~n", []),
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{FinalRes, {Dataloss, Critical}} =
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case Res0 of
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ok ->
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Res1 = stabilize(CmdsLen, Target),
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{Res1, confirm_result(Target)};
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_ ->
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?V("Res0=~w~n", [Res0]),
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{Res0, {undefined, undefined}}
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end,
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_ = cleanup(Target),
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%% Process is leaking? This log line can be removed after fix.
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[?V("process_count=~w~n", [erlang:system_info(process_count)]) || Verbose],
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pretty_commands(
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?MODULE, Cmds, {Seq, Par, Res0},
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aggregate(with_title(cmds), command_names(Cmds),
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collect(with_title(length5), (CmdsLen div 5) * 5,
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collect(with_title(conc), concurrency(Cmds),
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{FinalRes, {Dataloss, Critical}} =:= {ok, {0, 0}})))
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)
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end)).
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%% Initilization / setup
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%% Fake initialization function for debugging in shell like:
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%% > eqc_gen:sample(eqc_statem:commands(machi_ap_repair_eqc)).
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%% but not so helpful.
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initial_state() ->
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#state{cr_count=3}.
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initial_state(Num, Verbose) ->
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AllListE = all_list_extra(Num),
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FLUNames = [P#p_srvr.name || {P, _Dir} <- AllListE],
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MgrNames = [{Name, machi_flu_psup:make_mgr_supname(Name)} || Name <- FLUNames],
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#state{num=Num, verbose=Verbose,
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flu_names=FLUNames, mgr_names=MgrNames,
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cr_count=cr_count(Num)}.
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setup_target(Num, Seed, Verbose) ->
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%% ?V("setup_target(Num=~w, Seed=~w~nn", [Num, Seed]),
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AllListE = all_list_extra(Num),
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FLUNames = [P#p_srvr.name || {P, _Dir} <- AllListE],
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MgrNames = [{Name, machi_flu_psup:make_mgr_supname(Name)} || Name <- FLUNames],
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Dict = orddict:from_list([{P#p_srvr.name, P} || {P, _Dir} <- AllListE]),
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setup_chain(Seed, AllListE, FLUNames, MgrNames, Dict),
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_ = setup_cpool(AllListE, FLUNames, Dict),
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Target = #target{flu_names=FLUNames, mgr_names=MgrNames,
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verbose=Verbose},
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%% Don't wait for complete chain. Even partialy completed, the chain
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%% should work fine. Right?
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wait_until_stable(chain_state_all_ok(FLUNames), FLUNames, MgrNames,
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20, Verbose),
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Target.
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setup_chain(Seed, AllListE, FLUNames, MgrNames, Dict) ->
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ok = shutdown_hard(),
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[begin
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machi_flu1_test:clean_up_data_dir(Dir),
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filelib:ensure_dir(Dir ++ "/not-used")
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end || {_P, Dir} <- AllListE],
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[catch ets:delete(T) || T <- tabs()],
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[ets:new(T, [set, public, named_table,
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{write_concurrency, true}, {read_concurrency, true}]) ||
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T <- tabs()],
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{ok, _} = application:ensure_all_started(machi),
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SimSpec = {part_sim,
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{machi_partition_simulator, start_link, [{0,0,0}, 0, 100]},
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permanent, 500, worker, []},
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{ok, _PSimPid} = supervisor:start_child(machi_sup, SimSpec),
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ok = machi_partition_simulator:set_seed(Seed),
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_Partitions = machi_partition_simulator:get(FLUNames),
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%% Start FLUs and setup the chain
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FLUOpts = [{use_partition_simulator, true},
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%% {private_write_verbose, true},
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{active_mode, false},
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{simulate_repair, false}],
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[{ok, _} = machi_flu_psup:start_flu_package(Name, Port, Dir, FLUOpts) ||
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{#p_srvr{name=Name, port=Port}, Dir} <- AllListE],
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[machi_chain_manager1:set_chain_members(MgrName, Dict) || {_, MgrName} <- MgrNames],
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ok.
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setup_cpool(AllListE, FLUNames, Dict) ->
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Num = length(AllListE),
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FCList = [begin
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{ok, PCPid} = machi_proxy_flu1_client:start_link(P),
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{Name, PCPid}
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end || {_, #p_srvr{name=Name}=P} <- Dict],
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%% CR clients are pooled, each has "name" which is interpreted "From"
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%% side of simulated partition.
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SimSelfNames = lists:append(lists:duplicate(cr_count(Num), FLUNames)),
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CRList = [begin
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{ok, C} = machi_cr_client:start_link(
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[P || {_, P} <- Dict],
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[{use_partition_simulator, true},
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{simulator_self_name, SimSelfName},
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{simulator_members, FLUNames}]),
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{SimSelfName, C}
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end || SimSelfName <- SimSelfNames],
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catch ets:delete(cpool),
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ets:new(cpool, [set, protected, named_table, {read_concurrency, true}]),
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ets:insert(cpool, {fc_list, FCList}),
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ets:insert(cpool, {cr_list, CRList}),
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{CRList, FCList}.
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fc_list() ->
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[{fc_list, FCList}] = ets:lookup(cpool, fc_list),
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FCList.
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cr_list() ->
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[{cr_list, CRList}] = ets:lookup(cpool, cr_list),
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CRList.
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%% Post run_commands
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stabilize(0, _T) ->
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ok;
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stabilize(_CmdsLen, #target{flu_names=FLUNames, mgr_names=MgrNames,
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verbose=Verbose}) ->
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machi_partition_simulator:no_partitions(),
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true = wait_until_stable(chain_state_all_ok(FLUNames), FLUNames, MgrNames,
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100, Verbose),
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ok.
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chain_state_all_ok(FLUNames) ->
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[{FLUName, {FLUNames, [], []}} || FLUName <- FLUNames].
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confirm_result(_T) ->
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[{_, C} | _] = cr_list(),
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[{written, _Written}, {accpt, Accpt},
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{failed, Failed}, {critical, Critical}] = tab_counts(),
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{OK, Dataloss} = confirm_written(C),
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?V(" Written=~w, DATALOSS=~w, Acceptable=~w~n", [OK, Dataloss, Accpt]),
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?V(" Failed=~w, Critical=~w~n~n", [Failed, Critical]),
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DirBase = get_dir_base(),
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Suffix = dump_file_suffix(),
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case Failed of
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0 -> ok;
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_ ->
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DumpFailed = filename:join(DirBase, "dump-failed-" ++ Suffix),
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?V("Dump failed ETS tab to: ~w~n", [DumpFailed]),
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ets:tab2file(?FAILED_TAB, DumpFailed)
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end,
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case Critical of
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0 -> ok;
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_ ->
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DumpCritical = filename:join(DirBase, "dump-critical-" ++ Suffix),
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?V("Dump critical ETS tab to: ~w~n", [DumpCritical]),
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ets:tab2file(?CRITICAL_TAB, DumpCritical)
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end,
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{Dataloss, Critical}.
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confirm_written(C) ->
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ets:foldl(
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fun({Key, Bin}, {OK, NG}) ->
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case assert_chunk(C, Key, Bin) of
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ok -> {OK+1, NG};
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{error, _} -> {OK, NG+1}
|
|
end
|
|
end, {0, 0}, ?WRITTEN_TAB).
|
|
|
|
assert_chunk(C, {Off, Len, FileName}=Key, Bin) ->
|
|
%% TODO: This probably a bug, read_chunk respnds with filename of `string()' type
|
|
FileNameStr = binary_to_list(FileName),
|
|
%% TODO : Use CSum instead of binary (after disuccsion about CSum is calmed down?)
|
|
case (catch machi_cr_client:read_chunk(C, FileName, Off, Len, [], sec(3))) of
|
|
{ok, {[{FileNameStr, Off, Bin, _}], []}} ->
|
|
ok;
|
|
{ok, Got} ->
|
|
?V("read_chunk got different binary for Key=~p~n", [Key]),
|
|
?V(" Expected: ~p~n", [{[{FileNameStr, Off, Bin, <<"CSum-NYI">>}], []}]),
|
|
?V(" Got: ~p~n", [Got]),
|
|
{error, different_binary};
|
|
{error, Reason} ->
|
|
?V("read_chunk error for Key=~p: ~p~n", [Key, Reason]),
|
|
{error, Reason};
|
|
Other ->
|
|
?V("read_chunk other error for Key=~p: ~p~n", [Key, Other]),
|
|
{error, Other}
|
|
end.
|
|
|
|
cleanup(_Target) ->
|
|
[begin unlink(FC), catch exit(FC, kill) end || {_, FC} <- fc_list()],
|
|
[begin unlink(CR), catch exit(CR, kill) end || {_, CR} <- cr_list()],
|
|
_ = shutdown_hard().
|
|
|
|
%% Internal misc utilities
|
|
|
|
eqc_verbose() ->
|
|
os:getenv("EQC_VERBOSE") =:= "true".
|
|
|
|
eqc_timeout(Default) ->
|
|
PropTimeout = case os:getenv("EQC_TIMEOUT") of
|
|
false -> Default;
|
|
V -> list_to_integer(V)
|
|
end,
|
|
{PropTimeout, PropTimeout * 300}.
|
|
|
|
get_port_dir_base() ->
|
|
I = case os:getenv("EQC_BASE_PORT") of
|
|
false -> 0;
|
|
V -> list_to_integer(V)
|
|
end,
|
|
D = get_dir_base(),
|
|
{7400 + (I * 100), D ++ "/" ++ integer_to_list(I)}.
|
|
|
|
get_dir_base() ->
|
|
case os:getenv("EQC_BASE_DIR") of
|
|
false -> "./eqc";
|
|
DD -> DD
|
|
end.
|
|
|
|
shutdown_hard() ->
|
|
_STOP = application:stop(machi),
|
|
timer:sleep(100).
|
|
|
|
tick(#state{flu_names=FLUNames, mgr_names=MgrNames,
|
|
verbose=Verbose}) ->
|
|
tick(FLUNames, MgrNames, Verbose).
|
|
|
|
tick(FLUNames, MgrNames, Verbose) ->
|
|
tick(FLUNames, MgrNames, 2, 100, Verbose).
|
|
|
|
tick(FLUNames, MgrNames, Iter, SleepMax, Verbose) ->
|
|
TickFun = tick_fun(FLUNames, MgrNames, self()),
|
|
TickFun(Iter, 0, SleepMax),
|
|
FCList = fc_list(),
|
|
[?V("## Chain state after tick()=~w~n", [chain_state(FCList)]) || Verbose].
|
|
|
|
tick_fun(FLUNames, MgrNames, Parent) ->
|
|
fun(Iters, SleepMin, SleepMax) ->
|
|
%% ?V("^", []),
|
|
Trigger =
|
|
fun(FLUName, MgrName) ->
|
|
random:seed(now()),
|
|
[begin
|
|
erlang:yield(),
|
|
SleepMaxRand = random:uniform(SleepMax + 1),
|
|
%% io:format(user, "{t}", []),
|
|
Elapsed = machi_chain_manager1:sleep_ranked_order(
|
|
SleepMin, SleepMaxRand,
|
|
FLUName, FLUNames),
|
|
MgrName ! tick_check_environment,
|
|
%% Be more unfair by not sleeping here.
|
|
timer:sleep(max(SleepMax - Elapsed, 1)),
|
|
ok
|
|
end || _ <- lists:seq(1, Iters)],
|
|
Parent ! {done, self()}
|
|
end,
|
|
Pids = [{spawn(fun() -> Trigger(FLUName, MgrName) end), FLUName} ||
|
|
{FLUName, MgrName} <- MgrNames ],
|
|
[receive
|
|
{done, ThePid} ->
|
|
ok
|
|
after 120*1000 ->
|
|
exit({icky_timeout, M_name})
|
|
end || {ThePid, M_name} <- Pids]
|
|
end.
|
|
|
|
wait_until_stable(ExpectedChainState, FLUNames, MgrNames, Verbose) ->
|
|
wait_until_stable(ExpectedChainState, FLUNames, MgrNames, 20, Verbose).
|
|
|
|
wait_until_stable(ExpectedChainState, FLUNames, MgrNames, Retries, Verbose) ->
|
|
TickFun = tick_fun(FLUNames, MgrNames, self()),
|
|
FCList = fc_list(),
|
|
wait_until_stable1(ExpectedChainState, TickFun, FCList, Retries, Verbose).
|
|
|
|
wait_until_stable1(_ExpectedChainState, _TickFun, FCList, 0, _Verbose) ->
|
|
?V(" [ERROR] wait_until_stable failed.... : ~p~n", [chain_state(FCList)]),
|
|
false;
|
|
wait_until_stable1(ExpectedChainState, TickFun, FCList, Reties, Verbose) ->
|
|
[TickFun(3, 0, 100) || _ <- lists:seq(1, 3)],
|
|
Normalized = normalize_chain_state(chain_state(FCList)),
|
|
case Normalized of
|
|
ExpectedChainState ->
|
|
[?V(" Got stable chain: ~w~n", [chain_state(FCList)]) || Verbose],
|
|
true;
|
|
_ ->
|
|
[?V(" NOT YET stable chain: ~w~n", [chain_state(FCList)]) || Verbose],
|
|
wait_until_stable1(ExpectedChainState, TickFun, FCList, Reties-1, Verbose)
|
|
end.
|
|
|
|
normalize_chain_state(ChainState) ->
|
|
lists:usort([{FLUName,
|
|
{lists:usort(UPI), lists:usort(Repairing), lists:usort(Down)}} ||
|
|
{FLUName, {_EpochNo, UPI, Repairing, Down}} <- ChainState]).
|
|
|
|
chain_state(FCList) ->
|
|
lists:usort(
|
|
[case (catch machi_proxy_flu1_client:read_latest_projection(C, private, sec(5))) of
|
|
{ok, #projection_v1{epoch_number=EpochNo, upi=UPI,
|
|
repairing=Repairing, down=Down}} ->
|
|
{FLUName, {EpochNo, UPI, Repairing, Down}};
|
|
Other ->
|
|
{FLUName, Other}
|
|
end || {FLUName, C} <- FCList]).
|
|
|
|
tabs() -> [?WRITTEN_TAB, ?ACCPT_TAB, ?FAILED_TAB, ?CRITICAL_TAB].
|
|
|
|
tab_counts() ->
|
|
[{T, ets:info(T, size)} || T <- tabs()].
|
|
|
|
sec(Sec) ->
|
|
timer:seconds(Sec).
|
|
|
|
commands_len({SeqCmds, ParCmdsList} = _Cmds) ->
|
|
lists:sum([length(SeqCmds) | [length(P) || P <- ParCmdsList]]);
|
|
commands_len(Cmds) ->
|
|
length(Cmds).
|
|
|
|
concurrency({_SeqCmds, ParCmdsList} = _Cmds) -> length(ParCmdsList);
|
|
concurrency(_) -> 1.
|
|
|
|
dump_file_suffix() ->
|
|
{{Year, Month, Day}, {Hour, Min, Sec}} = calendar:local_time(),
|
|
lists:flatten(
|
|
io_lib:format("~4.10.0B-~2.10.0B-~2.10.0BT~2.10.0B:~2.10.0B:~2.10.0B.000Z",
|
|
[Year, Month, Day, Hour, Min, Sec])).
|
|
|
|
-endif. % EQC
|
|
-endif. % TEST
|