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max_user_offline_messages:

    - 5000: admin

    - 100

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<<"Your contact offline message queue is "

"full. The message has been discarded.">>

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%% Warn senders that their messages have been discarded:

% discard_warn_sender(Msgs) ->

%     lists:foreach(fun (#offline_msg{from = From, to = To,

%                   packet = Packet}) ->

%             ErrText = <<"Your contact offline message queue is "

%                     "full. The message has been discarded.">>,

%             Lang = xml:get_tag_attr_s(<<"xml:lang">>, Packet),

%             Err = jlib:make_error_reply(Packet,

%                             ?ERRT_RESOURCE_CONSTRAINT(Lang,

%                                       ErrText)),

%             ejabberd_router:route(To, From, Err)

%         end,

%         Msgs).

discard_warn_sender(US, Msgs, Count, MaxOfflineMsgs, mnesia) ->

    ?INFO_MSG("Begin to discard offline msgs at time:~s", [erlang:timestamp()]),

    R = mnesia:select(offline_msg,[{#offline_msg{us = US, _='_'},[],['$_']}]),

    Rsort = lists:sort(fun(A, B) -> A#offline_msg.timestamp < B#offline_msg.timestamp end,R),

    {M, _} = lists:split(Count - MaxOfflineMsgs, Rsort),

    F = fun() ->

        lists:foreach(fun(X) ->

            mnesia:delete_object(X)

        end,M),

        if Count - MaxOfflineMsgs >= (?OFFLINE_TABLE_LOCK_THRESHOLD) ->

                  mnesia:write_lock_table(offline_msg);

            true -> ok

        end,

        lists:foreach(fun (N) -> mnesia:write(N) end, Msgs)

    end,

    mnesia:transaction(F),

    ?INFO_MSG("Discard offline msgs:~w", [M]),

    ?INFO_MSG("End to discard offline msgs at time:~s", [erlang:timestamp()]);

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“As far as I know dets can only handle 2GB files not 4GB, which will be the limit for disc_copies. There is an experimental 64-bit dets which can handle much larger files but no one has used it in production yet. – Happi ”