[Serusers] SER stops responding

[Samuel Osorio Calvo]

Hi,

I'm not an expert so maybe my guessings are not wright, but I'll try to
help: 

There are several possiblities for these "SER time-outs". 

The first is the DNS resolving process. When a SER child is making a
DNS query it is blocked, and it does not answer to further incoming
queries. Therefore if all your childs are making this DNS queries, no
process will be available for responding the new requests. 
To solve this situation, use stateful behaviour because only the first
request within a transaction requiring DNS resolution will *block*. In
the other hand, if you use stateless SER, ALL requests will require a
DNS query...
(by the way, this information is taken from the SER's admin
guide....have all of the mailing-list subscribers read it? I recomend
it....)

Another possibility is the flexible-but-unreliable exec calls from SER
config file. It is also stated in the admin guide that the use of exec
reduces a lot SER performance and you should be really careful using
them.......having a SER child stoped for an uncertain amount of time
until the exec command finishes can lead to "blocking" phases, for
instance.

One comment: why not changing the current DNS blocking queries for a
non-blocking queries such as reSIProcate does with ARES library??? I
have no idea if it would be a high effort in the SER core...it's just a
possible enhancement....

I hope I was not *completely* wrong and I could help you,
Samuel.


Unclassified.
>>> "Matt Schulte" <mschulte at netlogic.net> 02/18/05 03:55PM >>>
I've had this problem too, especially running syslog debug or external
processes. what ver of ser are you running? We had to ditch a lot of
our
external processes because I assumed they took too long to run, no one
on the list was any help so I just gave up. Not being a coder is very
frustrating..

-----Original Message-----
From: AJ Grinnell [mailto:ajgrinnell at gmail.com] 
Sent: Friday, February 18, 2005 8:44 AM
To: serusers at lists.iptel.org 
Subject: [Serusers] SER stops responding


I am having a strange problem with 0.9.0. At random times, SER will
just
stop responding. I run ethereal, and can see INVITEs, REGISTERs and
OPTIONs requests, but SER does not respond to any of them. The process
does not die, and moni tells me that SER is still running, just no
respones. Sometimes SER will recover after a few minutes, most of the
time it doesnt. Any ideas?

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