[rabbitmq-discuss] queue is locked exclusively

Tue Aug 4 15:02:00 BST 2009

Hi Matthias,

We do use the queuename supplied by client. It is unique as we use the
processid + userid + datetime in it.
I think the error we are getting might be because of the issue you have
mentioned where the connection terminates non-cleanly.

Thanks
Rajesh

-----Original Message-----
From: Matthias Radestock [mailto:matthias at lshift.net] 
Sent: 04 August 2009 12:41
To: Reddy, Rajesh (GPT EMEA)
Cc: rabbitmq-discuss at lists.rabbitmq.com
Subject: Re: [rabbitmq-discuss] queue is locked exclusively

Rajesh,

Reddy, Rajesh (GPT EMEA) wrote:
> there is something going wrong and trying to resubscribe on
> an existing queue.
> I have added some debug info to the log files, so may be I will get
more
> information regarding why is this happening.

Is the client naming the queue or is it getting the server to generate a
name for it?

The reason I am asking is that if you re-use the same queue name then
there is an unavoidable race condition which might trigger the
RESOURCE_LOCKED error. Specifically, if the connection terminates
non-cleanly, e.g. it gets dropped due to a client or network failure,
and you then immediately reconnect, the auto-deletion of resources of
the old connection may not have happened yet.

I reckon it is unlikely you'd run into this, since the auto-deletion
happens quite quickly, but it is a possibility.

Regards,

Matthias.

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