[erlang-questions] Issues with ets:match_delete

[Code Wiget]

Yes.. that was it, thank you!



On Jul 13, 2018, 11:44 AM -0400, Sverker Eriksson <sverker@REDACTED>, wrote:
> The table is 'protected', meaning only the owner <0.1064.0> can write to it.
>
> /Sverker
>
>
> On fre, 2018-07-13 at 11:05 -0400, Code Wiget wrote:
> > Here is a full run of it. I am working on the open source project cqerl:
> >
> > (NODE)19> [Test] = ets:match_object(cqerl_clusters, {'_', '_', {Node, '$1'}}).
> > [{cluster_table,'$primary_cluster',
> >                 {{{192,168,1,104},9042},
> >                  [{cassandra_nodes,[{<<"192.168.1.107">>,9042},
> >                                     {<<"192.168.1.104">>,9042}]},
> >                   {keyspace,devices},
> >                   {included_applications,[]},
> >                   {reconnect_interval,12}]}}]
> > (NODE)20> ets:delete_object(cqerl_clusters, Test).
> > ** exception error: bad argument
> >      in function  ets:delete_object/2
> >         called as ets:delete_object(cqerl_clusters,
> >                                     {cluster_table,'$primary_cluster',
> >                                                    {{{192,168,1,104},9042},
> >                                                     [{cassandra_nodes,[{<<"192.168.1.107">>,9042},
> >                                                                        {<<"192.168.1.104">>,9042}]},
> >                                                      {keyspace,devices},
> >                                                      {included_applications,[]},
> >                                                      {reconnect_interval,12}]}})
> > (NODE)21> ets:delete_object(cqerl_clusters, [Test]).
> > ** exception error: bad argument
> >      in function  ets:delete_object/2
> >         called as ets:delete_object(cqerl_clusters,
> >                                     [{cluster_table,'$primary_cluster',
> >                                                     {{{192,168,1,104},9042},
> >                                                      [{cassandra_nodes,[{<<"192.168.1.107">>,9042},
> >                                                                         {<<"192.168.1.104">>,9042}]},
> >                                                       {keyspace,devices},
> >                                                       {included_applications,[]},
> >                                                       {reconnect_interval,12}]}}])
> >
> > Cant figure why the match is working but not the delete..
> >
> > On Jul 13, 2018, 11:01 AM -0400, Code Wiget <codewiget95@REDACTED>, wrote:
> > > Here, it seems alive
> > >
> > > (NODE13> ets:info(table_name).
> > > [{read_concurrency,true},
> > >  {write_concurrency,false},
> > >  {compressed,false},
> > >  {memory,422},
> > >  {owner,<0.1064.0>},
> > >  {heir,none},
> > >  {name,cqerl_clusters},
> > >  {size,2},
> > >  {node,’NODE'},
> > >  {named_table,true},
> > >  {type,bag},
> > >  {keypos,2},
> > >  {protection,protected}]
> > >
> > >
> > > On Jul 13, 2018, 7:24 AM -0400, Sverker Eriksson <sverker.eriksson@REDACTED>, wrote:
> > > > Your ets:match_delete looks fine.
> > > > Are you sure the table is still alive? Try ets:info(table_name).
> > > >
> > > > When you get an exception in the Erlang shell, the shell process will terminate and be restarted
> > > > losing all process specific resources such as ets tables.
> > > >
> > > >
> > > > /Sverker, Erlang/OTP
> > > >
> > > >
> > > > On tor, 2018-07-12 at 16:35 -0400, Code Wiget wrote:
> > > > > Hey everyone,
> > > > >
> > > > > Lets say you have an ets table with entries as shown below:
> > > > >
> > > > > {table_name, key, {A, [B]}.
> > > > >
> > > > > I am trying to delete all table entries matching A. I can create a match like so:
> > > > >
> > > > > ets:match(table_name, {'_', '_', {Node, '$1'}})
> > > > >
> > > > > and it returns the values for B. But when I run match_delete or select_delete, I get a badarg error…:
> > > > >
> > > > > > ets:match_delete(table_name, {'_', '_', {Node, '$1'}}).
> > > > > > ** exception error: bad argument
> > > > > >      in function  ets:select_delete/2
> > > > > >         called as ets:select_delete(table_name,
> > > > > >                                     [{{'_','_',{{{192,168,1,104},9042},'$1'}},[],[true]}])
> > > > > >      in call from ets:match_delete/2 (ets.erl, line 726)
> > > > > > (NODE)16> ets:select_delete(table_name, {'_', '_', {Node, '$1'}}).
> > > > > > ** exception error: bad argument
> > > > > >      in function  ets:select_delete/2
> > > > > >         called as ets:select_delete(table_name,{'_','_',{{{192,168,1,104},9042},'$1'}})
> > > > >
> > > > > So I tried to match and object and delete it...
> > > > >
> > > > > > (NODE)17> ets:match_object(table_name, {'_', '_', {Node, '$1'}}).
> > > > > > [{table_name,'$primary_cluster',
> > > > > >                 Info…]
> > > > > >
> > > > > >
> > > > > > (NODE)25> ets:delete_object(table_name, Info).
> > > > > > ** exception error: bad argument
> > > > > >      in function  ets:delete_object/2
> > > > > >         called as ets:delete_object(table_name, …. )
> > > > > >
> > > > > I would like to avoid re-creating the table structure, as it is not from a project that I created and would take some time to fix all the code. How do I delete something from this table?
> > > > >
> > > > > Thanks!
> > > > >
> > > > >
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