[erlang-questions] Timeout in erl_call

Knut Nesheim <>
Thu Oct 6 16:05:44 CEST 2011


On Thu, Oct 6, 2011 at 1:58 PM, Ahmed Omar <> wrote:
> Are you using the option -s with erl_call?
> This situation could occur if :
> 1) the new node started by erl_call can't connect to your live node (because
> of cookies for example, but in that case u should find a log about
> connection attempt from disallowed node)
> 2) there's a started node for communication, and erl_call can't connect to
> it to do the next call

Yes, we are using "-s". The second situation you describe turns out to
be our problem. If we are executing two erl_calls at the same time the
last one will crash.

Most of the time the code executed inside the node was returning so
fast, that this never was a problem, but at certain times there would
be a 10x spike in latency which would cause the two processes to run
at the same time. The second process would then time out.

Not running these at the same time solved our problem. Thanks to
everybody who helped out.

Regards
Knut

>
> It might be helpful also if you provide more details, using -d option
> (debug) for erl_call
> On Thu, Oct 6, 2011 at 8:35 AM, CGS <> wrote:
>>
>> Hi Knut,
>> Let me see if I understood correctly. The problem is not continuous for
>> the same machine, but only from time to time? If not, check your
>> installation because, as far as I know, node-to-node communication uses RPC
>> which, in this case, needs to be set to accept communication without
>> entering any user/password (key-pair authentication and the processes to
>> belong to the user for which the key was created). Otherwise, if the problem
>> appears and disappears for a machine, there are few things which you can
>> check:
>> 1. If OTP (application/monitor/gen_server), check what your monitor is
>> reporting and see if you can match any crash/attempt to restart a generic
>> server.
>> 2. Check if your listener is not busy.
>> 3. In case of sending to a spawned thread, if the thread is up.
>> ...and so on. You can notice that the more info you give us, the better
>> for us to understand your problem. Parts of the log would be very helpful
>> (just don't forget to replace the sensitive data with generic ones - e.g.,
>> mydomain.com with example.com).
>> Cheers,
>> CGS
>>
>>
>>
>> On Wed, Oct 5, 2011 at 7:00 PM, Knut Nesheim <>
>> wrote:
>>>
>>> On Wed, Oct 5, 2011 at 5:33 PM, Joel Reymont <> wrote:
>>> >
>>> > Is there heavy traffic between the nodes?
>>> >
>>>
>>> No, I don't think the traffic should be a problem. From this machine
>>> to other machines in the cluster we do around 10 messages per second
>>> that are between 2k and 10k in size.
>>>
>>> Knut
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>
>
>
> --
> Best Regards,
> - Ahmed Omar
> http://nl.linkedin.com/in/adiaa
> Follow me on twitter
> @spawn_think
>
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