<html>
<head>
<style><!--
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
font-size: 10pt;
font-family:Tahoma
}
--></style></head>
<body class='hmmessage'><div dir='ltr'>
Hi Vlad,<br><br>We have many locations with 5-10 phones each. We use applications that require us to keep track of device states continuously for each location. We would prefer to have each location handled by the same Asterisk server both for incoming and outbound calls including registrations and subscriptions. It's more scalable and cleaner this way. If that server goes down, the whole location traffic as a whole moves to the next available server. That's why I need more control over dispatching.<br><br>Anyway, instead of using "061002", "061003", "061005", "061006", "061007", "061008", if I use "1", "2", "3", "4", "5", "6", I get a much reasonable distribution (at least for 6 locations I use for testing). For 50+ locations, the results might be different of course.<br><br>Thanks,<br>Matt<br><pre class="ecxmoz-signature"><br></pre><br><br><br><div><div id="SkyDrivePlaceholder"></div><hr id="stopSpelling">Date: Fri, 3 Feb 2012 12:50:25 +0200<br>From: vladpaiu@opensips.org<br>To: users@lists.opensips.org<br>Subject: Re: [OpenSIPS-Users] dispatcher problem<br><br>
<meta http-equiv="Content-Type" content="text/html; charset=unicode">
<meta name="Generator" content="Microsoft SafeHTML">
Hi Matt,<br>
<br>
If you want good distribution, why don't you use instead the
round-robin or the random dispatcher algorithms? <br>
<br>
[1] <a href="http://www.opensips.org/html/docs/modules/devel/dispatcher.html#id293072" target="_blank">http://www.opensips.org/html/docs/modules/devel/dispatcher.html#id293072</a><br>
<br>
Regards,<br>
<pre class="ecxmoz-signature">--
Vlad Paiu
OpenSIPS Developer
<a class="ecxmoz-txt-link-freetext" href="http://opensips-solutions.org/" target="_blank">http://opensips-solutions.org/</a></pre>
<br>
Pe 2/3/2012 2:59 AM, Matt Hamilton a scris:
<blockquote cite="mid:BAY170-W131E441A43A3A0418D82E04B3710@phx.gbl">
<style>
.ExternalClass .ecxhmmessage P
{padding:0px;}
.ExternalClass body.ecxhmmessage
{font-size:10pt;font-family:Tahoma;}
</style>
<div dir="ltr">
<pre class="ecxmoz-signature"><font style="" face="Arial">Hi Răzvan,
I don't assign any weights, and I use the dispatcher.list file:
</font></pre>
<font style="" face="Arial">1 <a class="ecxmoz-txt-link-freetext" target="_blank">sip:x.x.x.11:5060</a></font><font style="" face="Arial"><br>
</font><font style="" face="Arial">1 <a class="ecxmoz-txt-link-freetext" target="_blank">sip:x.x.x.12:5060</a></font><font style="" face="Arial"><br>
</font><font style="" face="Arial">1 <a class="ecxmoz-txt-link-freetext" target="_blank">sip:x.x.x.13:5060</a></font><font style="" face="Arial"><br>
</font><font style="" face="Arial"><br>
</font><font style="" face="Arial"><br>
When there are only 2 servers in that file, I always get:<br>
</font>
<pre class="ecxmoz-signature"><font style="" face="Arial">DBG:dispatcher:ds_select_dst: alg hash [1], id [1] and dispatcher selects the 2nd entry.</font></pre>
<br>
When there are 3 servers - when the dispatcher distributes to
all 3 servers, I get<br>
<font style="" face="Arial"><br>
</font><font style="" face="Arial"><br>
</font><font style="" face="Arial">DBG:dispatcher:ds_select_dst:
alg hash [0], id [0]</font><font style="" face="Arial">
before it dispatches to server1 (x.x.x.11)</font><br>
<pre class="ecxmoz-signature"><font style="" face="Arial">DBG:dispatcher:ds_select_dst: alg hash [1], id [1] for x.x.x.12</font></pre>
<font style="" face="Arial">DBG:dispatcher:ds_select_dst: alg
hash [2], id [2]</font> for x.x.x.13<br>
<br>
<br>
<br>
Anyway I did some more tests, and it turns out that the hash
algorithm is very sensitive to the PV. <br>
<br>
1. when the input hash_pvar is from this set (my original set
that gave me problems): "061002" "061003" "061005" "061006"
"61007" "061008"<br>
Dispatcher splits them:<br>
Server1: 0<br>
server2: 6<br>
<br>
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)<br>
Server1: 2<br>
Server2: 4<br>
<br>
3. If I add another character, so that PVs look like x1"061002"<br>
Server1: 3<br>
Server2: 3<br>
<br>
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.<br>
<br>
Thanks,<br>
Matt<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<div>
<hr id="ecxstopSpelling">Date: Fri, 3 Feb 2012 00:36:37 +0200<br>
From: <a class="ecxmoz-txt-link-abbreviated" href="mailto:razvancrainea@opensips.org">razvancrainea@opensips.org</a><br>
To: <a class="ecxmoz-txt-link-abbreviated" href="mailto:users@lists.opensips.org">users@lists.opensips.org</a><br>
Subject: Re: [OpenSIPS-Users] dispatcher problem<br>
<br>
Hi, Matt!<br>
<br>
So for different hashed strings like:<br>
<pre class="ecxmoz-signature">DBG:dispatcher:ds_hash_pvar: Hashing "061002"!</pre>
you always get the same output:<br>
<pre class="ecxmoz-signature">DBG:dispatcher:ds_select_dst: alg hash [1], id [1]</pre>
<br>
Also, are you assigning different weights for any of the
Asterisk?<br>
<br>
Regards,<br>
<pre class="ecxmoz-signature">--
Răzvan Crainea
OpenSIPS Developer
<a class="ecxmoz-txt-link-freetext" href="http://opensips-solutions.org/" target="_blank">http://opensips-solutions.org/</a></pre>
<br>
<br>
On 02/03/2012 12:16 AM, Matt Hamilton wrote:
<blockquote cite="mid:BAY170-W101531F8659E2307ACFA171B3700@phx.gbl">
<style>
.ExternalClass .ecxhmmessage P
{padding:0px;}
.ExternalClass body.ecxhmmessage
{font-size:10pt;font-family:Tahoma;}
</style>
<div dir="ltr">
<pre class="ecxmoz-signature">Hi Răzvan,
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] <a class="ecxmoz-txt-link-rfc2396E" target="_blank"><sip:x.x.x.13:5060></a>
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
</pre>
<br>
<br>
<div>
<hr id="ecxstopSpelling">Date: Thu, 2 Feb 2012 22:51:46
+0200<br>
From: <a class="ecxmoz-txt-link-abbreviated" href="mailto:razvancrainea@opensips.org">razvancrainea@opensips.org</a><br>
To: <a class="ecxmoz-txt-link-abbreviated" href="mailto:users@lists.opensips.org">users@lists.opensips.org</a><br>
Subject: Re: [OpenSIPS-Users] dispatcher problem<br>
<br>
Hi, Matt!<br>
<br>
Are you sure you are not using the same hashing value
all the time?<br>
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 ".<br>
<br>
Regards,<br>
<pre class="ecxmoz-signature">--
Răzvan Crainea
OpenSIPS Developer
<a class="ecxmoz-txt-link-freetext" href="http://opensips-solutions.org/" target="_blank">http://opensips-solutions.org/</a></pre>
<br>
<br>
On 02/02/2012 10:15 PM, Matt Hamilton wrote:
<blockquote cite="mid:BAY170-W67F0D5151A0ACC65C6CAF3B3700@phx.gbl">
<style>
.ExternalClass .ecxhmmessage P
{padding:0px;}
.ExternalClass body.ecxhmmessage
{font-size:10pt;font-family:Tahoma;}
</style>
<div dir="ltr"> Hi,<br>
<br>
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.,<br>
<br>
when serverB is down, dispatches to serverA<br>
when serverA is down, dispatches to serverB<br>
when both up, dispatches to serverB<br>
while dispatching to serverA when serverB is down,
if I activate serverB, all requests dispatched to
serverB <br>
<br>
<br>
Here is my code:<br>
<br>
modparam("dispatcher", "hash_pvar", "$avp(75)")<br>
<br>
<br>
in the script, I'm setting $avp(75) to one of the
following "061002", "061003", "061004", "061005",
"061006" just before calling ds_select_dst.<br>
<br>
$avp(75)=..<br>
ds_select_dst("1", "7");<br>
<br>
Any ideas why this is happening?<br>
<br>
Regards,<br>
Matt<br>
</div>
<br>
<fieldset class="ecxmimeAttachmentHeader"></fieldset>
<br>
<pre>_______________________________________________
Users mailing list
<a class="ecxmoz-txt-link-abbreviated" href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a>
<a class="ecxmoz-txt-link-freetext" href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users" target="_blank">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a>
</pre>
</blockquote>
<br>
_______________________________________________ Users
mailing list <a class="ecxmoz-txt-link-abbreviated" href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a>
<a class="ecxmoz-txt-link-freetext" href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users" target="_blank">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a></div>
</div>
<br>
<fieldset class="ecxmimeAttachmentHeader"></fieldset>
<br>
<pre>_______________________________________________
Users mailing list
<a class="ecxmoz-txt-link-abbreviated" href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a>
<a class="ecxmoz-txt-link-freetext" href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users" target="_blank">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a>
</pre>
</blockquote>
<br>
_______________________________________________
Users mailing list
<a class="ecxmoz-txt-link-abbreviated" href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a>
<a class="ecxmoz-txt-link-freetext" href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users" target="_blank">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a></div>
</div>
<br>
<fieldset class="ecxmimeAttachmentHeader"></fieldset>
<br>
<pre>_______________________________________________
Users mailing list
<a class="ecxmoz-txt-link-abbreviated" href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a>
<a class="ecxmoz-txt-link-freetext" href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users" target="_blank">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a>
</pre>
</blockquote>
<br>
<br>_______________________________________________
Users mailing list
Users@lists.opensips.org
http://lists.opensips.org/cgi-bin/mailman/listinfo/users</div> </div></body>
</html>