[SR-Users] Dispatcher alg:7 not working accordingly
SamyGo
govoiper at gmail.com
Thu Jun 7 13:37:14 CEST 2012
Hi again,
yes my scenario is quiet simple. I've lots of users and groups of those
users are defined by UIDs, one UID means 70 users of one client whereas
other UID could've 3 users of another client.
So what I am trying to implement here is that calls from one same UID are
always routed to exactly one same destination server. That'll help in
issues like call-parking, call-pickup, conference calls etc.
I hope I've explained the scenario in simpler terms here.
Regards,
Sammy Go.
On Thu, Jun 7, 2012 at 4:20 PM, Daniel-Constantin Mierla
<miconda at gmail.com>wrote:
> Hello,
>
> that hash function is intended for hashing alpha-numeric usernames and has
> a fair distribution for such cases.
>
> I don't think is good for hashing numbers, at the end of a day, a number
> is already like a hash code. You can use in the config file modulo
> operation to select a particular destination based on a number.
>
> Maybe if you explain what is your target to implement, we can provide the
> right hints to do it.
>
> Cheers,
> Daniel
>
>
> On 6/6/12 6:09 PM, SamyGo wrote:
>
> Sorry for late reply: this wasn't very helpful. I think Hashing algo code
> needs to get bit smarter. If there is any possibility can you please let me
> know. !
>
>
> On Mon, Jun 4, 2012 at 3:33 PM, Daniel-Constantin Mierla <
> miconda at gmail.com> wrote:
>
>> To make the life easier to spot the hash code in such case, I just
>> committed a small patch to print it for alg 7:
>>
>>
>> http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=83a558fbad700198a8667ef01f756269d7e2c310
>>
>> Should be easy to backport if other version is used.
>>
>> Cheers,
>> Daniel
>>
>>
>> On 6/4/12 12:23 PM, Carsten Bock wrote:
>>
>>> 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 <%2B49%20179%202021244>
>>>>> Office +49 40 34927219 <%2B49%2040%2034927219>
>>>>> Fax +49 40 34927220 <%2B49%2040%2034927220>
>>>>>
>>>>> 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
>>>> 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
>>
>
>
> --
> Daniel-Constantin Mierla - http://www.asipto.comhttp://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
>
>
>
>
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