我在 erlang 中丢失的消息有一些问题。
我正在使用的代码在我手动使用时 100% 正确，仅当我的代码用于“负载测试”时，我与大量请求并行测试代码时，接收器部分从未收到某些消息. 在记录所有步骤和参数值时，我发现我发送消息的地址是正确的。消息本身也没有问题。
我的问题如下：在erlang中是否知道这种“丢失消息”，这可能是erlang本身的一些错误吗？
如果需要，我可以发布一些我正在使用的代码，但我认为它不会特别为这个问题增加很多价值。
更新：我的应用程序的主要部分。这是很多代码来说明我的问题，但我无法在简化版本中重现我的问题。该应用程序是一个分配系统，即它将并行保留网格中的单元集合。重要的部分是： globalManager，一个将控制整个分配系统的参与者。rowManager 将管理整个网格的一行，并在进行预订时锁定该行。当必须保留一个单元区域时，调用函数 request_specific_cells。此函数将向必须修改行的所有行管理器发送预订请求。当行管理器在其行中保留了区域时，它将向 globalManager 发送确认。当所有的rowmanagers都发送确认信息后，
globalManager(Grid) ->
receive
{Pid, request_specific_cells, ReservationId, Coordinates, Ctr, XX} ->
NewGrid = request_specific_cells(Grid, Pid, ReservationId, Coordinates, Ctr, XX);
{Pid, confirm_region, ResId, Rid, Sid, Region, Section, Ctr, XX} ->
NewGrid = confirm_region(Grid, Pid, ResId, Rid, Sid, Region, Section, Ctr, XX);
{Pid, failed_region, Rid, Region, Ctr, XX} ->
NewGrid = failed_region(Grid, Pid, Rid, Region, Ctr, XX);
Else ->
erlang:display({unexpectedMessage, actor, Else}),
NewGrid = Grid
end,
globalManager(NewGrid).
request_specific_cells(Grid, Pid, ReservationId, Coordinates, Ctr, XX) ->
{{Width, Height}, GridRows, MaxAllocationSize, FreeCells, {UnspecificRequests, NextId}, PendingRequests, BlockedRows} = Grid,
{X, Y, W, H} = Coordinates,
Rows = lists:seq(Y,Y+H-1),
% Is one of the blocks that have to be reserved currently blocked?
BlockedRow = lists:foldl(fun(B, Acc) -> Acc xor search_list(B,BlockedRows) end, false, Rows),
Request = lists:keyfind(ReservationId, 1, UnspecificRequests),
{ReservationId, _} = Request,
% Now we need the addresses of the sections in which the regions has to be reserved.
SubSectionIds = [ SPid || {_,SPid} <- [ lists:keyfind(Row, 1, GridRows) || Row <- Rows]],
% Storing request enables us to rollback if one of the registrations fails.
NewPendingRequests = PendingRequests ++ [{length(PendingRequests), 0, lists:map(fun(S) -> {S,null} end, SubSectionIds)}],
% Send a registration command with the needed section to each corresponding section manager.
[SPid ! {self(), request, Pid, ReservationId, length(PendingRequests), Coordinates, Ctr, XX} || SPid<- SubSectionIds],
NewBlockedRows = Rows ++ BlockedRows,
{{Width, Height}, GridRows, MaxAllocationSize, FreeCells, {UnspecificRequests, NextId}, NewPendingRequests, NewBlockedRows}
end.
confirm_region(Grid, Pid, URid, Rid, Sid, Region, Section, Cttr, XX) ->
{Dimensions, GridRows, MaxAllocationSize, FreeCells, {UnspecificRequests, NextId}, PendingRequests, BlockedRows} = Grid,
{_,RY,_,_} = Region,
if
% All blocks have confirmed the reservation so the entire request is successful
(Ctr+1) == length(Spids) ->
NewUnspecificRequests = lists:keydelete(URid, 1, UnspecificRequests),
NewPendingRequests = lists:keydelete(Rid, 1, PendingRequests),
NewSpids = lists:keyreplace(Sid, 1, Spids, {Sid, Section}),
[Spid ! {self(), confirm_region, Sec} || {Spid, Sec} <- NewSpids],
Pid ! {self(), request_specific_cells, Rid, success};
true ->
NewUnspecificRequests = UnspecificRequests,
% Safe the region that has to be marked/rolled back in the row
NewSpids = lists:keyreplace(Sid, 1, Spids, {Sid, Section}),
% Increase counter of confirmations
NewPendingRequests = lists:keyreplace(Rid, 1, PendingRequests, {Rid, Ctr+1, NewSpids})
end,
NewBlockedRows = delete_list(RY, BlockedRows)
{Dimensions, GridRows, MaxAllocationSize, FreeCells, {NewUnspecificRequests, NextId}, NewPendingRequests, NewBlockedRows}.
rowManager(Row) ->
receive
{Mid, request, Pid, URid, Rid, Region, Ctr, XX} ->
NewRow = request_region(Row, Mid, Pid, URid, Rid, Region, Ctr, XX);
Else ->
erlang:display({unexpectedMessage, rowManager, Else}),
NewRow = Row
end,
rowManager(NewRow).
request_region(Row, Mid, Pid, URid, Rid, Coordinates, Ctr, XX) ->
{RY, Content, Modified} = Row,
{X,_,W,_} = Coordinates,
if
Modified == false ->
Free = region_is_empty({X,1,W,1}, Content),
if
Free -> NewModified = true,
NewContent = mark_region({X,1,W,1}, Content, reserved),
Mid ! {Pid, confirm_region, URid, Rid, self(), Coordinates, {X,1,W,1}, Ctr, XX};
true -> NewModified = false,
NewContent = Content,
Mid ! {Pid, failed_region, Rid, Coordinates, Ctr, XX}
end;
true -> NewModified = false,
NewContent = Content,
Mid ! {Pid, failed_region, Rid, Coordinates, Ctr, XX}
end,
{RY, NewContent, NewModified}.
保留者将使用此代码：
request_specific_cells(FollowUpPid, ReservationId, {X, Y, Width, Height}, Ctr, XX) ->
FollowUpPid ! {self(), request_specific_cells, ReservationId, {X, Y, Width, Height}, Ctr, XX},
receive
{FollowUpPid, request_specific_cells, ReservationId, SuccessOrFailure} ->
SuccessOrFailure
end.
我认为这个接收器在收到答案之前就死了，因为我知道
Pid ! {self(), request_specific_cells, Rid, success}
从 confirm/9 函数总是以正确的值执行，但并不总是在函数中接收。