[OpenSIPS-Users] dispatcher problem
Vlad Paiu
vladpaiu at opensips.org
Fri Feb 3 11:50:25 CET 2012
Hi Matt,
If you want good distribution, why don't you use instead the round-robin
or the random dispatcher algorithms?
[1] http://www.opensips.org/html/docs/modules/devel/dispatcher.html#id293072
Regards,
--
Vlad Paiu
OpenSIPS Developer
http://opensips-solutions.org/
Pe 2/3/2012 2:59 AM, Matt Hamilton a scris:
> Hi Ra(zvan,
>
> I don't assign any weights, and I use the dispatcher.list file:
> 1 sip:x.x.x.11:5060
> 1 sip:x.x.x.12:5060
> 1 sip:x.x.x.13:5060
>
>
> When there are only 2 servers in that file, I always get:
> DBG:dispatcher:ds_select_dst: alg hash [1], id [1] and dispatcher selects the 2nd entry.
>
> When there are 3 servers - when the dispatcher distributes to all 3
> servers, I get
>
>
> DBG:dispatcher:ds_select_dst: alg hash [0], id [0] before it
> dispatches to server1 (x.x.x.11)
> DBG:dispatcher:ds_select_dst: alg hash [1], id [1] for x.x.x.12
> DBG:dispatcher:ds_select_dst: alg hash [2], id [2] for x.x.x.13
>
>
>
> Anyway I did some more tests, and it turns out that the hash algorithm
> is very sensitive to the PV.
>
> 1. when the input hash_pvar is from this set (my original set that
> gave me problems): "061002" "061003" "061005" "061006" "61007"
> "061008"
> Dispatcher splits them:
> Server1: 0
> server2: 6
>
> 2. if I add a 1 in front of my hash PV - so that the new values are
> 1"061002", etc. (indentation mark is part of the string)
> Server1: 2
> Server2: 4
>
> 3. If I add another character, so that PVs look like x1"061002"
> Server1: 3
> Server2: 3
>
> 3-3 or 2-4 split is OK of course, but the 0-6 split threw me off. Is
> there a "safe" PV (integers, certain combinations, etc.) that I can
> use that will give me the best distribution? I can use a lookup table
> (like dialplan) to get those.
>
> Thanks,
> Matt
>
>
>
>
>
>
>
>
> ------------------------------------------------------------------------
> Date: Fri, 3 Feb 2012 00:36:37 +0200
> From: razvancrainea at opensips.org
> To: users at lists.opensips.org
> Subject: Re: [OpenSIPS-Users] dispatcher problem
>
> Hi, Matt!
>
> So for different hashed strings like:
> DBG:dispatcher:ds_hash_pvar: Hashing "061002"!
> you always get the same output:
> DBG:dispatcher:ds_select_dst: alg hash [1], id [1]
>
> Also, are you assigning different weights for any of the Asterisk?
>
> Regards,
> --
> Ra(zvan Crainea
> OpenSIPS Developer
> http://opensips-solutions.org/
>
>
> On 02/03/2012 12:16 AM, Matt Hamilton wrote:
>
> Hi Ra(zvan,
>
> Yes, I'm using the same hashing values - the values I assign to the PV are also
> passed to the ds_select_dst correctly as far as I can see. Here is a typical
> debug output:
>
> DBG:dispatcher:ds_hash_pvar: Hashing "061002"!
> DBG:dispatcher:ds_select_dst: alg hash [1], id [1]
> DBG:dispatcher:ds_select_dst: selected [7-1/1]<sip:x.x.x.13:5060>
> DBG:dispatcher:ds_select_dst: using entry [1/0]
>
>
> I ran some test with 3 Asterisk servers with interesting results:
>
> With 3 Asterisk servers specified in dispatcher.list, here is the distribution:
>
> Server1: 061003
> Server2: 061002, 061007, 061008
> Server3: 061005, 061006
>
> With only Server1 and Server2 specified in dispatcher.list:
>
> Server1:
> Server2: 061002, 061003, 061005, 061006, 61007, 061008
>
>
> Likewise, with Server1 and Server3, Server3 gets everything.
> with Server2 and Server3, Server3 gets everything.
>
> Is there anything I can do to fix this (somehow trick the function assuming the way I do is the correct way)?
>
> Thanks,
> Matt
>
>
>
>
>
>
>
>
> ------------------------------------------------------------------------
> Date: Thu, 2 Feb 2012 22:51:46 +0200
> From: razvancrainea at opensips.org <mailto:razvancrainea at opensips.org>
> To: users at lists.opensips.org <mailto:users at lists.opensips.org>
> Subject: Re: [OpenSIPS-Users] dispatcher problem
>
> Hi, Matt!
>
> Are you sure you are not using the same hashing value all the time?
> If yes, can you increase your debugging level to 6 and provide
> more information? I would be looking in the opensips log for lines
> that contain the following strings: "ds_hash_pvar: Hashing " and
> "ds_select_dst: alg hash ".
>
> Regards,
>
> --
> Ra(zvan Crainea
> OpenSIPS Developer
> http://opensips-solutions.org/
>
>
>
> On 02/02/2012 10:15 PM, Matt Hamilton wrote:
>
> Hi,
>
> I'm using Opensips to dispatch to 2 servers - serverA,
> serverB. When one of the servers is down, Opensips is
> dispatching to the active one correctly. However, when both of
> them are Active, it's picking only one of them and ignoring
> the other; e.g.,
>
> when serverB is down, dispatches to serverA
> when serverA is down, dispatches to serverB
> when both up, dispatches to serverB
> while dispatching to serverA when serverB is down, if I
> activate serverB, all requests dispatched to serverB
>
>
> Here is my code:
>
> modparam("dispatcher", "hash_pvar", "$avp(75)")
>
>
> in the script, I'm setting $avp(75) to one of the following
> "061002", "061003", "061004", "061005", "061006" just before
> calling ds_select_dst.
>
> $avp(75)=..
> ds_select_dst("1", "7");
>
> Any ideas why this is happening?
>
> Regards,
> Matt
>
>
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