[rabbitmq-discuss] Rabbit Crashing

Tue Nov 29 12:06:00 GMT 2011

Merek,

Thank you! I installed the management plugin and I could see the file
descriptors increasing until the limit.
Then I set the limit using the command you suggest (ulimit -n).
Everything worked fine.
One more question, I would like to know where did you find
that  "{error,emfile}" is (errno 24 - "too many file descriptors opened").

Thank you again, you really help me!

Cheers,

Bruno Carneiro

2011/11/28 Marek Majkowski <majek04 at gmail.com>

> On Mon, Nov 28, 2011 at 18:57, Bruno Carneiro <brunoac88 at gmail.com> wrote:
> > Hi Folks,
> > I'm using Rabbit 2.6.1 with the plugins:
> > * amqp_client-2.6.1
> > * mochiweb-1.3-rmq2.6.1-git9a53dbd
> > * rabbitmq_jsonrpc-2.6.1
> > * rabbitmq_jsonrpc_channel-2.6.1
> > * rabbitmq_jsonrpc_channel_examples-2.6.1
> > * rabbitmq_mochiweb-2.6.1
> > * rfc4627_jsonrpc-2.6.1-git30c8498
> > * webmachine-1.7.0-rmq2.6.1-hg0c4b60a
> >
> > When I start Rabbit it goes down after a few minutes. Using list_queues I
> > get:
> > unable to connect to node rabbit at HackSprintFreud: nodedown
> > Logs:
> > =ERROR REPORT==== 28-Nov-2011::16:46:58 ===
> >     application: mochiweb
> >     "Accept failed error"
> >     "{error,emfile}"
>
>
> Just a blind guess:
>  EMFILE (errno 24 - "too many file descriptors opened")
>
> Maybe you have too many files opened? You can see
> the numbers using management plugin.
>
> On linux you can increase the limit by running
> `ulimit -n <number>`, but you have to be root.
>
> Usually, rabbit tries to optimize the usage of file descriptors,
> in case when you have many queues it can mean that rabbit
> opens loads of files. But as you open more and more network
> sockets the number of opened files should drop.
>
> This may not be a case for jsonrpc - AFAIK it doesn't have
> code for dealing with usual rabbitmq file descriptor
> counters. Theoretically in that case, when you have many
> files opened by jsonrpc - you may hit the wall.
>
> I suggest run the management plugin and checking the
> file descriptors counters, trying to get understanding about
> jsonrpc plugin usage. And increasing the file descriptor
> limit if necessary.
>
> Cheers,
>    Marek
>
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