[erlang-bugs] epmd not cleaning up node name if node is down.

Zbyszek Żółkiewski <>
Mon Aug 18 14:11:18 CEST 2008


so? no one have any idea?

On Fri, Aug 15, 2008 at 14:22, Zbyszek Żółkiewski <>wrote:

> Hello, thanks for the reply,
>
> System is Debian 4.0, custom compiled erlang OTP R11B-5,
> Erlang (BEAM) emulator version 5.5.5 [source] [smp:2] [async-threads:0]
> [hipe] [kernel-poll:true]
> (so the nodes are running with +K true -smp options)
>
> software that we use is ejabberd xmpp server, we are using cluster mode
> with 3 nodes (2 on one server and 1 on other server), in this case node was
> crashed,
> but the same situation appear on both servers, if i stop node with
> init:stop()., ctrl+G, k 1, q combination - so quite legaly exiting and
> shuting down node...
>
> so do you have any clue what can cause that epmd is not removing entry from
> its table? and what we can do to determine problem, and finaly, is there any
> way of clear epmd table from invalid entries?
>
> thanks,
>
>
>
> 2008/8/15 Kenneth Lundin <>
>
>> Hi,
>>
>> The normal and correct behaviour is that a node is unregistered from
>> epmd when it is shutdown.
>> each Erlang node that register to epmd establishes and keep an open
>> tcp connection towards epmd.
>> When that connection is broken the Erlang node is unregistered.
>>
>> On what OS is this?
>> How is the Erlang node shutdown?
>>
>> I just run an example on Suse Linux where I create 2 Erlang nodes like
>> this:
>>
>> erl -sname a
>>
>> and in another shell
>>
>> erl -sname b
>>
>> In a third shell epmd -names reported both nodes.
>>
>> I then tried to terminate one of the nodes normally and epmd -names
>> correctly reported that there
>> is only one node left.
>>
>> i started the second node again and epmd -names reported the 2 nodes.
>>
>> I killed one of the nodes with kill -9 and again epmd -names reported
>> only one node as expected.
>>
>> There must be something else causing the behaviour on your system.
>>
>> /Kenneth Erlang/OTP team Ericsson
>>
>>
>
> --
> pozdrawiam,
> Zbyszek Żółkiewski
>



-- 
pozdrawiam,
Zbyszek Żółkiewski
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