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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_db_partition_info).
-export([go/2]).
-include_lib("fabric/include/fabric.hrl").
-include_lib("mem3/include/mem3.hrl").
go(DbName, Partition) ->
Shards = mem3:shards(DbName, <<Partition/binary, ":foo">>),
Workers = fabric_util:submit_jobs(Shards, get_partition_info, [Partition]),
RexiMon = fabric_util:create_monitors(Shards),
Fun = fun handle_message/3,
Acc0 = {fabric_dict:init(Workers, nil), []},
try
case fabric_util:recv(Workers, #shard.ref, Fun, Acc0) of
{ok, Acc} -> {ok, Acc};
{timeout, {WorkersDict, _}} ->
DefunctWorkers = fabric_util:remove_done_workers(
WorkersDict,
nil
),
fabric_util:log_timeout(
DefunctWorkers,
"get_partition_info"
),
{error, timeout};
{error, Error} -> throw(Error)
end
after
rexi_monitor:stop(RexiMon)
end.
handle_message({rexi_DOWN, _, {_,NodeRef},_}, _Shard, {Counters, Acc}) ->
case fabric_util:remove_down_workers(Counters, NodeRef) of
{ok, NewCounters} ->
{ok, {NewCounters, Acc}};
error ->
{error, {nodedown, <<"progress not possible">>}}
end;
handle_message({rexi_EXIT, Reason}, Shard, {Counters, Acc}) ->
NewCounters = fabric_dict:erase(Shard, Counters),
case fabric_ring:is_progress_possible(NewCounters) of
true ->
{ok, {NewCounters, Acc}};
false ->
{error, Reason}
end;
handle_message({ok, Info}, #shard{dbname=Name} = Shard, {Counters, Acc}) ->
Acc2 = [Info | Acc],
Counters1 = fabric_dict:erase(Shard, Counters),
case fabric_dict:size(Counters1) =:= 0 of
true ->
[FirstInfo | RestInfos] = Acc2,
PartitionInfo = get_max_partition_size(FirstInfo, RestInfos),
{stop, [{db_name, Name} | format_partition(PartitionInfo)]};
false ->
{ok, {Counters1, Acc2}}
end;
handle_message(_, _, Acc) ->
{ok, Acc}.
get_max_partition_size(Max, []) ->
Max;
get_max_partition_size(MaxInfo, [NextInfo | Rest]) ->
{sizes, MaxSize} = lists:keyfind(sizes, 1, MaxInfo),
{sizes, NextSize} = lists:keyfind(sizes, 1, NextInfo),
{external, MaxExtSize} = lists:keyfind(external, 1, MaxSize),
{external, NextExtSize} = lists:keyfind(external, 1, NextSize),
case NextExtSize > MaxExtSize of
true ->
get_max_partition_size(NextInfo, Rest);
false ->
get_max_partition_size(MaxInfo, Rest)
end.
% for JS to work nicely we need to convert the size list
% to a jiffy object
format_partition(PartitionInfo) ->
{value, {sizes, Size}, PartitionInfo1} = lists:keytake(sizes, 1, PartitionInfo),
[{sizes, {Size}} | PartitionInfo1].
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