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<pre class="ecxmoz-signature"><font style="" face="Arial">Hi Răzvan,<br><br>I don't assign any weights, and I use the dispatcher.list file:<br></font></pre><font style="" face="Arial">1 sip:x.x.x.11:5060</font><font style="" face="Arial"><br></font><font style="" face="Arial">1 sip:x.x.x.12:5060</font><font style="" face="Arial"><br></font><font style="" face="Arial">1 sip:x.x.x.13:5060</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"></font><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><div id="SkyDrivePlaceholder"></div><hr id="stopSpelling">Date: Fri, 3 Feb 2012 00:36:37 +0200<br>From: razvancrainea@opensips.org<br>To: users@lists.opensips.org<br>Subject: Re: [OpenSIPS-Users] dispatcher problem<br><br>
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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:
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<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] <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
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<br>
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<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:
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<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>
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