[SR-Users] Dispatcher alg:7 not working accordingly
SamyGo
govoiper at gmail.com
Thu Jun 14 10:48:08 CEST 2012
Thanks once again, it was helpful. I am trying it for now and will get back
if anything else is required.
Great help from you and once again Thanks alot.
Best Regards,
Sammy G.
On Thu, Jun 14, 2012 at 1:20 PM, Daniel-Constantin Mierla <miconda at gmail.com
> wrote:
> Hello,
>
>
> On 6/13/12 11:47 AM, SamyGo wrote:
>
> Hi again,
> Nice to read the comment from you. Yes it could be a case - but this race
> condition will remain valid until I put some check on the insertion and
> lock the resource if one user is using that table, I forgot what they say
> in programming terms
>
> What do you suggest i do to avoid this since I may have customers with
> SIP trunks and I'd have to apply concurrent call limits to them using the
> same logic.
>
>
> you can use lock functions from cfgutils to synchronize on a resource
> (like uid), should be better than locking an entire db table -- this will
> require that the updates will be done only from config, not by other
> applications.
>
> Cheers,
> Daniel
>
>
> Regards,
> Sammy.
>
>
> On Wed, Jun 13, 2012 at 1:23 PM, Daniel-Constantin Mierla <
> miconda at gmail.com> wrote:
>
>> Hello,
>>
>>
>> On 6/12/12 12:01 PM, SamyGo wrote:
>>
>> Thanks Sir,
>> Doing a static or even a run-time mapping of same UID calls to
>> destination server is what I thought about this type of case almost an year
>> ago.
>>
>> What I am thinking is : create a table for UID/Destination Mapping; for
>> a unique UID see if there is any destination in that table. If it exists
>> just jump to that server directly. If no UID/destination entry is found for
>> that UID then invoke Dispatcher; select destination, make call to it, and
>> store this in UID/destination map table !!
>>
>> Let me know if there could be any improvement in this.
>>
>>
>> can be a solution, indeed. You may have a race if that user does calls
>> in parallel first time and different destinations are selected -- not sure
>> it is the case for you.
>>
>> Cheers,
>> Daniel
>>
>>
>>
>> Thanks
>> Best Regards,
>> Sammy G.
>>
>> On Tue, Jun 12, 2012 at 2:43 PM, Daniel-Constantin Mierla <
>> miconda at gmail.com> wrote:
>>
>>> Hello,
>>>
>>> if you are using integer UID, I would suggest you use modulo operation
>>> to select the destination address -- this will require config operations
>>> only.
>>>
>>> Another option you can map an UID to a dispatcher set id (e.g., via
>>> mtree or htable) and then you can do the alg 8.
>>>
>>> Cheers,
>>> Daniel
>>>
>>>
>>> On 6/7/12 1:37 PM, SamyGo wrote:
>>>
>>> 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
>>>>
>>>>
>>>>
>>>>
>>>
>>> --
>>> 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
>>>
>>>
>>>
>>>
>>
>> --
>> 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
>>
>>
>>
>>
>
> --
> 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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