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% Licensed 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(fabric_view_reduce).
-export([go/7]).
-include_lib("fabric/include/fabric.hrl").
-include_lib("mem3/include/mem3.hrl").
-include_lib("couch/include/couch_db.hrl").
-include_lib("couch_mrview/include/couch_mrview.hrl").
go(DbName, GroupId, View, Args, Callback, Acc0, VInfo) when is_binary(GroupId) ->
{ok, DDoc} = fabric:open_doc(DbName, <<"_design/", GroupId/binary>>, []),
go(DbName, DDoc, View, Args, Callback, Acc0, VInfo);
go(Db, DDoc, VName, Args, Callback, Acc, VInfo) ->
DbName = fabric:dbname(Db),
{Shards, RingOpts} = fabric_view:get_shards(Db, Args),
{CoordArgs, WorkerArgs} = fabric_view:fix_skip_and_limit(Args),
DocIdAndRev = fabric_util:doc_id_and_rev(DDoc),
RPCArgs = [DocIdAndRev, VName, WorkerArgs],
fabric_view:maybe_update_others(DbName, DocIdAndRev, Shards, VName, Args),
Repls = fabric_ring:get_shard_replacements(DbName, Shards),
StartFun = fun(Shard) ->
hd(fabric_util:submit_jobs([Shard], fabric_rpc, reduce_view, RPCArgs))
end,
Workers0 = fabric_util:submit_jobs(Shards,fabric_rpc,reduce_view,RPCArgs),
RexiMon = fabric_util:create_monitors(Workers0),
try
case fabric_streams:start(Workers0, #shard.ref, StartFun, Repls,
RingOpts) of
{ok, ddoc_updated} ->
Callback({error, ddoc_updated}, Acc);
{ok, Workers} ->
try
go2(DbName, Workers, VInfo, CoordArgs, Callback, Acc)
after
fabric_streams:cleanup(Workers)
end;
{timeout, NewState} ->
DefunctWorkers = fabric_util:remove_done_workers(
NewState#stream_acc.workers,
waiting
),
fabric_util:log_timeout(
DefunctWorkers,
"reduce_view"
),
Callback({error, timeout}, Acc);
{error, Error} ->
Callback({error, Error}, Acc)
end
after
rexi_monitor:stop(RexiMon)
end.
go2(DbName, Workers, {red, {_, Lang, View}, _}=VInfo, Args, Callback, Acc0) ->
#mrargs{limit = Limit, skip = Skip, keys = Keys, update_seq = UpdateSeq} = Args,
RedSrc = couch_mrview_util:extract_view_reduce(VInfo),
OsProc = case os_proc_needed(RedSrc) of
true -> couch_query_servers:get_os_process(Lang);
_ -> nil
end,
State = #collector{
db_name = DbName,
query_args = Args,
callback = Callback,
counters = fabric_dict:init(Workers, 0),
keys = Keys,
skip = Skip,
limit = Limit,
lang = Lang,
os_proc = OsProc,
reducer = RedSrc,
collation = couch_util:get_value(<<"collation">>, View#mrview.options),
rows = dict:new(),
user_acc = Acc0,
update_seq = case UpdateSeq of true -> []; false -> nil end
},
try rexi_utils:recv(Workers, #shard.ref, fun handle_message/3,
State, fabric_util:view_timeout(Args), 1000 * 60 * 60) of
{ok, NewState} ->
{ok, NewState#collector.user_acc};
{timeout, NewState} ->
Callback({error, timeout}, NewState#collector.user_acc);
{error, Resp} ->
{ok, Resp}
after
if OsProc == nil -> ok; true ->
catch couch_query_servers:ret_os_process(OsProc)
end
end.
handle_message({rexi_DOWN, _, {_, NodeRef}, _}, _, State) ->
fabric_view:check_down_shards(State, NodeRef);
handle_message({rexi_EXIT, Reason}, Worker, State) ->
fabric_view:handle_worker_exit(State, Worker, Reason);
handle_message({meta, Meta0}, {Worker, From}, State) ->
Seq = couch_util:get_value(update_seq, Meta0, 0),
#collector{
callback = Callback,
counters = Counters0,
user_acc = AccIn,
update_seq = UpdateSeq0
} = State,
% Assert that we don't have other messages from this
% worker when the total_and_offset message arrives.
0 = fabric_dict:lookup_element(Worker, Counters0),
rexi:stream_ack(From),
Counters1 = fabric_dict:update_counter(Worker, 1, Counters0),
UpdateSeq = case UpdateSeq0 of
nil -> nil;
_ -> [{Worker, Seq} | UpdateSeq0]
end,
case fabric_dict:any(0, Counters1) of
true ->
{ok, State#collector{
counters = Counters1,
update_seq = UpdateSeq
}};
false ->
Meta = case UpdateSeq of
nil ->
[];
_ ->
[{update_seq, fabric_view_changes:pack_seqs(UpdateSeq)}]
end,
{Go, Acc} = Callback({meta, Meta}, AccIn),
{Go, State#collector{
counters = fabric_dict:decrement_all(Counters1),
user_acc = Acc
}}
end;
handle_message(#view_row{key=Key} = Row, {Worker, From}, State) ->
#collector{counters = Counters0, rows = Rows0} = State,
true = fabric_dict:is_key(Worker, Counters0),
Rows = dict:append(Key, Row#view_row{worker={Worker, From}}, Rows0),
C1 = fabric_dict:update_counter(Worker, 1, Counters0),
State1 = State#collector{rows=Rows, counters=C1},
fabric_view:maybe_send_row(State1);
handle_message(complete, Worker, #collector{counters = Counters0} = State) ->
true = fabric_dict:is_key(Worker, Counters0),
C1 = fabric_dict:update_counter(Worker, 1, Counters0),
fabric_view:maybe_send_row(State#collector{counters = C1});
handle_message(ddoc_updated, _Worker, State) ->
{stop, State}.
os_proc_needed(<<"_", _/binary>>) -> false;
os_proc_needed(_) -> true.
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