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From: Tim Watson <watson.timo...@gmail.com>
Date: Fri, 16 Nov 2012 10:25:44 +0000
Local: Fri, Nov 16 2012 5:25 am
Subject: Re: [erlang-questions] phantom ports in erlang:ports()
I can't get to the issue tracker right this moment, but these sockets are stuck in CLOSE_WAIT for a long time. The customer reports normally having circa 80±20 live connections, most of them listeners that do not close the sockets. Under normal conditions, there are no CLOSE_WAIT sockets showing up at all.
The customer also reports that even when the CLOSE_WAIT connections drop off that no further connections can be established, and we see some rather delightful errors coming back from these 'phantom' ports:
{inet_async,#Port<0.5808>,25398,{error,system_limit}} but the system limits are *not* reached by any stretch of the imagination:
{file_descriptors,
So this is more than just sockets stuck in CLOSE_WAIT by the looks of things.
On 16 Nov 2012, at 09:40, Valentin Micic wrote:
> I guess, a more interesting questions is weather or not sockets in this state may be seen as "phantom" ports?
_______________________________________________
> V/
> On 16 Nov 2012, at 11:32 AM, Jesper Louis Andersen wrote:
>> On Nov 16, 2012, at 7:29 AM, Valentin Micic <valen...@pixie.co.za> wrote:
>>> I am wondering if this may be attributed to CLOSE_WAIT/TIME_WAIT states sockets may be in during the connection shutdown?
>> TIME_WAIT is not a problem. It is just the kernel keeping track of the connection if packets get sent still by the other end. CLOSE_WAIT on the other hand sounds bad. This state should happen when the other end has sent a FIN and started to close down the socket, but the application (i.e., Erlang?) has not closed the socket down yet.
>> If you have lingering CLOSE_WAITs that are there for a long time it is usually a warning sign that something may be bad.
>> Jesper Louis Andersen
>> _______________________________________________
> _______________________________________________
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