[rabbitmq-discuss] RabbitMQ hangs, does not accept connections

Wed Jan 22 13:29:10 GMT 2014

Hi Dmitri Minaev,

        I am facing same problem with rabbitmq 3.2.2 ( I have gone through 
this thread and already checked memory and number of file-descriptors are 
not causing the problem). If you have solved that problem then please share 
the solution.  

Thanks,
Maulik

On Monday, 26 March 2012 11:15:45 UTC+5:30, Dmitri Minaev wrote:
>
> On 9 March 2012 16:37, Simon MacMullen <si... at rabbitmq.com <javascript:>> 
> wrote:
> > On 09/03/12 07:57, Dmitri Minaev wrote:
>
> >> If I understand correctly, the number of file descriptors used by
> >> RabbitMQ in normal situation is roughly equal to the number of
> >> `rabbitmqctl list_connections` + some constant (~30)? In case of that
> >> hanging server, the number of AMQP connections never was close to the
> >> FD limit (ulimit -n is 1024, fs.file-max = 1605698). The graph
> >> reflecting  the number of open AMQP connections is attached to this
> >> message.
> >
> >
> > It's not really a constant, but to a first approximation, yes.
> >
> > Ultimately, the error I saw being passed up from the OS was ENFILE - 
> that's
> > pretty unambiguous :)
> >
> > It's possible that if you're churning connections then "closed" 
> connections
> > in FIN_WAIT2 could account for the majority of the used FDs. In 2.8.0 
> we'll
> > set SO_LINGER to 0 to prevent this.
>
> I am still not sure about the role of the file descriptors in this
> event. Last Friday, our Rabbit died again. Until the very last moment
> the number of open file descriptors as reported by the management
> plugin was 143 out of the total available number of 32765. It was
> RabbitMQ v.2.7.0. On that same day I have upgraded to 2.8.1. Will
> report on its behaviour later.
>
> -- 
> With best regards,
> Dmitri Minaev
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