[SR-Users] Dispatcher alg:7 not working accordingly
Carsten Bock
carsten at ng-voice.com
Mon Jun 4 12:23:33 CEST 2012
It's hard to say, most likely not. You find the used hash-function here:
841 unsigned int ds_get_hash(str *x, str *y)
http://git.sip-router.org/cgi-bin/gitweb.cgi?p=sip-router;a=blob;f=modules_k/dispatcher/dispatch.c;h=ae0c51b122d34e29b3474957a64b24ff492cfcd5;hb=HEAD
It was originally implemented to distribute usernames to servers,
which worked fine.
Carsten
2012/6/4 SamyGo <govoiper at gmail.com>:
> Thanks Sir,
>
> Thats what I expected. Do you think this will change if I use only two
> values with huge difference in each other, lets say {26000,29000} ?
>
> Regards,
> Sammy
>
> On Mon, Jun 4, 2012 at 3:05 PM, Carsten Bock <carsten at ng-voice.com> wrote:
>>
>> Hi,
>>
>> this functionality uses a generic "hash" function to generate an
>> Integer-Value of the PVAR and then reduces this to the number hosts in
>> your destination set.
>> If you have only using two different values of the PVAR and only two
>> hosts in the dispatcher list, it can likely happen, that the same host
>> is choosen. You should try a wider range of values for your PVAR...
>> (e.g. try 1000 different values), then you should see a distribution.
>>
>> Carsten
>>
>> 2012/6/4 SamyGo <govoiper at gmail.com>:
>> > Hi,
>> >
>> > No, nothing at all. I haven't went too deep into debug logs but no
>> > internal
>> > error was appearing. Everything was as calm as ever and I only get one
>> > destination uri.
>> >
>> > So maybe what I'm getting from your email is that , for this to work the
>> > way
>> > I expect is to have more unique and random values in my hash_pvar to get
>> > the
>> > required functionality.
>> >
>> > Thanks once again,
>> > BR
>> > SG
>> >
>> > On Mon, Jun 4, 2012 at 11:52 AM, Daniel-Constantin Mierla
>> > <miconda at gmail.com> wrote:
>> >>
>> >> Hello,
>> >>
>> >> do you get any errors in the log?
>> >>
>> >> Be aware that hash functions may return same code for different input
>> >> values. A hash function is guaranteed to return same code for same
>> >> input
>> >> value, but there can be collisions of codes for different values.
>> >>
>> >> Cheers,
>> >> Daniel
>> >>
>> >>
>> >> On 6/3/12 3:41 PM, SamyGo wrote:
>> >>
>> >> Hello,
>> >>
>> >> I'm having trouble using algorithm 7 in dispatcher module. Here is my
>> >> kamailio version. The problem is that despite multiple dispatcher
>> >> entries
>> >> corresponding to one set all calls go only to only one destination.
>> >>
>> >>
>> >> [root at control1 ~]# kamailio -V
>> >> version: kamailio 3.2.3 (x86_64/linux) 59f87e
>> >> flags: STATS: Off, USE_IPV6, USE_TCP, USE_TLS, TLS_HOOKS,
>> >> USE_RAW_SOCKS,
>> >> DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC,
>> >> DBG_QM_MALLOC, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE,
>> >> USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
>> >> ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16,
>> >> MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 4MB
>> >> poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
>> >> id: 59f87e
>> >> compiled on 18:04:08 Apr 19 2012 with gcc 4.1.2
>> >> [root at control1 ~]#
>> >>
>> >> Here is the dipacther module params.
>> >>
>> >>
>> >>
>> >> # ------- Load-balancer params ------
>> >> modparam("dispatcher", "db_url", DBURL)
>> >> modparam("dispatcher", "table_name", "dispatcher")
>> >> modparam("dispatcher", "setid_col", "setid")
>> >> modparam("dispatcher", "destination_col", "destination")
>> >> modparam("dispatcher", "force_dst", 1)
>> >> modparam("dispatcher", "flags", 3)
>> >> modparam("dispatcher", "dst_avp", "$avp(i:271)")
>> >> modparam("dispatcher", "cnt_avp", "$avp(i:273)")
>> >> modparam("dispatcher", "ds_ping_from", "sip:proxy at 109.XXX.2XX.XX")
>> >> modparam("dispatcher", "ds_ping_interval",15)
>> >> modparam("dispatcher", "ds_probing_mode", 1)
>> >> modparam("dispatcher", "ds_ping_reply_codes",
>> >> "class=2;code=403;code=404;code=484;class=3")
>> >> modparam("dispatcher", "hash_pvar", "$avp(i:274)")
>> >> modparam("dispatcher", "ds_hash_size", 9)
>> >> modparam("dispatcher", "ds_hash_initexpire", 60)
>> >>
>> >>
>> >>
>> >> Below is the function call based on avp(i:274)
>> >>
>> >>
>> >>
>> >> avp_db_query("select uid from uid_did_map where accountcode =
>> >> '$fU'","$avp(i:274)");
>> >> xlog("L_INFO","$rm from $fu (IP:$si:$sp) ---------
>> >> UID:'$avp(i:274)-----------'\n");
>> >> ds_load_update();
>> >> if(!ds_select_dst("1","7")) {
>> >> sl_send_reply("500", "No destination
>> >> available");
>> >> xlog("route[MAIN] : $rm : No destinations
>> >> available for $rd");
>> >> exit;
>> >> }
>> >>
>> >>
>> >> I'm getting two different values for avp(i:274) {26,29} but the
>> >> destination are not hashed on its base.
>> >>
>> >> Please help.
>> >>
>> >> Regards,
>> >> Sammy G.
>> >>
>> >>
>> >>
>> >> _______________________________________________
>> >> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>> >> sr-users at lists.sip-router.org
>> >> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>> >>
>> >>
>> >> --
>> >> Daniel-Constantin Mierla - http://www.asipto.com
>> >> http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
>> >> Kamailio Advanced Training, Seattle, USA, Sep 23-26, 2012 -
>> >> http://asipto.com/u/katu
>> >> Kamailio Practical Workshop, Netherlands, Sep 10-12, 2012 -
>> >> http://asipto.com/u/kpw
>> >>
>> >>
>> >>
>> >
>> >
>> > _______________________________________________
>> > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>> > sr-users at lists.sip-router.org
>> > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>> >
>>
>>
>>
>> --
>> Carsten Bock
>> CEO (Geschäftsführer)
>>
>> ng-voice GmbH
>> Schomburgstr. 80
>> D-22767 Hamburg / Germany
>>
>> http://www.ng-voice.com
>> mailto:carsten at ng-voice.com
>>
>> Mobile +49 179 2021244
>> Office +49 40 34927219
>> Fax +49 40 34927220
>>
>> Sitz der Gesellschaft: Hamburg
>> Registergericht: Amtsgericht Hamburg, HRB 120189
>> Geschäftsführer: Carsten Bock
>> Ust-ID: DE279344284
>>
>> Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
>> http://www.ng-voice.com/imprint/
>>
>> _______________________________________________
>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>> sr-users at lists.sip-router.org
>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
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>
--
Carsten Bock
CEO (Geschäftsführer)
ng-voice GmbH
Schomburgstr. 80
D-22767 Hamburg / Germany
http://www.ng-voice.com
mailto:carsten at ng-voice.com
Mobile +49 179 2021244
Office +49 40 34927219
Fax +49 40 34927220
Sitz der Gesellschaft: Hamburg
Registergericht: Amtsgericht Hamburg, HRB 120189
Geschäftsführer: Carsten Bock
Ust-ID: DE279344284
Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
http://www.ng-voice.com/imprint/
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