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<  Open Telecom Platform (OTP)  ~  Mnesia:write/3 failure
flodis
Posted: Tue Jun 16, 2009 7:14 pm Reply with quote
User Joined: 09 Jul 2008 Posts: 27
I wrote a piece of code that should store a record containg node and its load in a mnesia db.
If the transaction fails its probably because the table does not exists so the table is created and then the transaction is run again.
However the mnesia:write/3 operation always fail with the error:
Code:
{aborted,{bad_type,{areasrv_load,'monsrv1@flodis-desktop',1}}}


The table is sucessfully created after the first transaction failure, but write/3 still fails.

Code:
register_areasrv_load(AreaSrv, Node, Load) ->
    F = fun() ->
            mnesia:write(AreaSrv,
                #areasrv_load{node=Node, load=Load}, write)
    end,
    case mnesia:transaction(F) of
        {atomic, Result} ->
            Result;
        %{aborted, {bad_type, _Record}} ->
        Failure ->
            error_logger:info_report([{failure, Failure}]),
            create_table(AreaSrv),
            mnesia:transaction(F)
    end.

create_table(AreaSrv) ->
    mnesia:create_table(AreaSrv, [{ram_copies, [node()]},
        {attributes, record_info(fields, areasrv_load)},
        {type, ordered_set}]),
    error_logger:info_report([{created_load_table, AreaSrv}]).
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flodis
Posted: Tue Jun 16, 2009 7:24 pm Reply with quote
User Joined: 09 Jul 2008 Posts: 27
I found out myself after some "Googling". If the name of the table differs from the record name, you have to provide the option {record_name, areasrv_load} to the options when the table is created.
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