[rabbitmq-discuss] Cannot start 'guid generator' (rabbitmq)

[Matthew Sackman]

On Thu, Aug 25, 2011 at 05:40:41AM -0700, Craig Blaszczyk wrote:
> There's nothing in the logs that look useful to me.

Ahh, but they look useful to me!

> 
> Here are they are:
> 
> ----------------- /var/log/rabbitmqrabbit\localhost-sasl.log 
> -----------------------
> =SUPERVISOR REPORT==== 25-Aug-2011::12:18:42 ===
>      Supervisor: {local,rabbit_guid_sup}
>      Context:    start_error
>      Reason:     {'EXIT',{{case_clause,{ok,[]}},
>                           [{rabbit_guid,update_disk_serial,0},

Your /var/lib/rabbitmq/mnesia/rabbit at localhost/rabbit_serial file is
empty. It shouldn't be, and it's an odd thing for it to be empty. Safest
bet is just to delete that file and then Rabbit should start up again
just fine. There's a small increased chance of GUID collision if you
have existing msgs stored in Rabbit, but the chance is sufficiently
small that I'd not worry too much...

Matthew