12 Aug
2019
12 Aug
'19
8:27 p.m.
Hi Alex,
there have been many changes to the modules between 5.1 and 5.2. I just
looked a bit to the code of dispatch.c and also the commits.
I noticed something in commit 3933a64c464acfb285e - there was a block
related to round-robin before which got removed in this refactoring (if
I analyzed it correctly):
- /* if alg is round-robin then update the shortcut to next to be
used */
- if(alg == DS_ALG_ROUNDROBIN)
- idx->last = (hash + 1) % idx->nr;
It could be simple added back, because of the changed logic, though.
Cheers,
Henning
Am 12.08.19 um 17:28 schrieb Alex Balashov:
Hi Daniel,
Haven’t checked that, no. But all the external system does is issue RPC commands
(`dispatcher.set_state`) maybe a few times a day. It’s nothing volatile or overly
Byzantine.
—
Sent from mobile, with due apologies for brevity and errors.
--
Henning Westerholt - https://skalatan.de/blog/
Kamailio services - https://skalatan.de/services
On Aug 12, 2019, at 11:24 AM, Daniel-Constantin
Mierla <miconda(a)gmail.com> wrote:
Hello,
could you observe similar behavior on other dispatchers that don't use
an external system tomanage activation and deactivation of the gateways?
Or you haven't checked such one so far?
Cheers,
Daniel
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On 12.08.19 15:23, Alex Balashov wrote:
Hi,
I've got a proxy that does very basic round-robin distribution of calls
to an elastic pool of servers, defined in a simple SQLite database with
equal priorities. Nothing too complicated, just a vanilla
`ds_select_domain("1", "4")`.
The only complication is that seldom are most of the gateways enabled.
Probing stuff was turned on, but didn't do quite what was desired, so it
was replaced with a system that manages activation and deactivation of
the gateways externally. Nevertheless, these are the left-over probing
settings:
modparam("dispatcher", "ds_ping_method", "OPTIONS")
modparam("dispatcher", "ds_ping_from",
"sip:pinger@domain")
modparam("dispatcher", "ds_ping_interval", 15)
modparam("dispatcher", "ds_probing_threshold", 256)
modparam("dispatcher", "ds_inactive_threshold", 1)
modparam("dispatcher", "ds_probing_mode", 0)
After an upgrade from 5.1 to 5.2.3 (009f62), the round-robin has become
extremely "sticky" and tendentious. That is to say, it directs _almost_
all calls to a single gateway -- the first gateway in the table --
though not 100%. There is also a marked tendency to send lots of
consecutive calls to the same gateway, even if it's not the first one,
though most of the time it is.
Has anyone experienced similar upon upgrading to 5.2?
Thanks much!
-- Alex
--
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda