[erlang-questions] Mnesia error when switching fro clustered to un-clustered mode

Chandru chandrashekhar.mullaparthi@REDACTED
Thu Jul 24 07:42:06 CEST 2014

Hi Kris,

When you say "When I switch them to clustered", how exactly did you do this?


On 18 July 2014 21:35, Kristoffer Brown <erlangerintraining@REDACTED> wrote:
> I have deployed my application to three nodes with mnesia in standalone
> mode. I have three tables, one of which recently changed. I have all three
> upgraded with the correct table schema and running fine in standalone mode.
> When I switch them to clustered I receive the following error
> {merge_schema_failed,
>                            "Bad cookie in table definition <the recently
> changed table?:
> I cannot determine what is causing this. I can delete the mnesia directory
> and re-start and it works fine. However, this is obviously not an acceptable
> solution for a production deployment.
> What could cause this error? All three nodes have the exact same schema and
> my understanding was that this was the cause of this issue. I think this
> just is the result of a newbie not understanding the purpose of the table
> cookie.
> Thanks.
> Kris
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