[SR-Users] [sr-dev] dialog module with DB Backend

Wed Mar 5 03:57:14 CET 2014

Just noticed the same thing in db_cassa_delete..
patch updated to fix both

Jay

On 5 March 2014 12:52, jay binks <jaybinks at gmail.com> wrote:

> Hi All,
>
> so Ive done what Carlos suggested and swapped out my dialog db to Mysql
> rather than cassandra.
> All worked 100% as you would expect.
>
> Right so the issue is db_cassandra .
>
> I started testing and going through the code.
>
> I found I had these lines, which was interesting & concerning.
> update_dialog_dbinfo_unsafe(): could not add another dialog to db
> I had been ignoring them, because the dialog was in the DB and I figured I
> would come back and figure that out later.
>
> but this seems to have been key to this whole thing.
>
> ends up that in dlg_db_handler.c dialog_dbf.insert was getting a 1 back
> from kamailio on the insert and a 0 back from mysql... WTF.. ok.
>
> so I trace into db_cassa_insert which calls db_cassa_modify ..
> around line 1210 I can see this ..
>
> CON_CASSA(_h)->con->batch_mutate(CFMap, oac::ConsistencyLevel::ONE);
> return 1;
>
> wrapped in a try / catch block..
> seems db_cassandra wants to return 1 for success but kamailio ( or dialog
> module at least ) expects 0 for success .
>
> so I change that to be return 0, and re-test.
> everything works as expected,    "could not add another dialog to db"
> stops coming up on my console,
> and dialogs are removed when calls hangup.
>
> seems this 1 thing is enough to screw dialogs in cassandra ( and who knows
> what else ).
> This is the reason for my email though,   if we simply change that to 0,
> what else may break !??
>
> however http://www.asipto.com/pub/kamailio-devel-guide/#c09f_insertclearly states that "0 if everything is OK"
> so this is clearly a bug that needs fixing.
>
> Can I get someone with more experience to test this for me and possibly
> apply the attached patch !?
>
> Jay
>
>
>
>
>
>
>
>
>
>
>
> On 25 February 2014 05:58, Daniel-Constantin Mierla <miconda at gmail.com>
> wrote:
> >
> > Hello,
> >
> > I pushed some patches to the master branch in order to remove the dialog
> from its associated profiles when it gets in terminated state. I
> encountered such issue (not that) recently, but I haven't gotten the time
> to get to it before.
> >
> > Then, the second patch is to not add dialogs in profiles when loading
> from database and the state is terminated (5).
> >
> > Here are the links to the patches:
> >
> > -
> http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=edf61acb57ed5e8ee0ca9ec1f796e43ce993be48
> > -
> http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=9b88eb7ee2d243882383a44f601baa21fd679cd5
> >
> > Should be straightforward to cherry pick to 4.1 (even 4.0 I expect). If
> you test and all goes fine, I will backport -- here I had no time for real
> testing.
> >
> > I plan also to not add the dialogs in memory for state terminated, but
> destroy them at db load time. But this needs a bit of a review, to be sure
> that all necessary callbacks are executed.
> >
> > On the other hand, if the dialogs are not removed from db, might be an
> issue with the database driver (cassandra in this case, which is rather new
> module). Do you get any syslog errors from kamailio or database server? I
> expect that people would have reported such issue for other database
> engines so far. Still it might be an issue, just that was not noticed...
> >
> > Cheers,
> > Daniel
> >
> > On 24/02/14 11:19, jay binks wrote:
> >
> > So poking round the code for the dialog module....
> > Im not sure what im missing here.
> >
> >
> > get_profile_size dosnt care bout the state of a dialog... so you get ALL
> dialogs that are in the hash table.
> > ( which is interesting if you want to use dialog module to enforce
> channel limits etc )
> >
> > So you go... OK...  kamailio only expects to have "ACTIVE" dialogs in
> the hash table... kewl..
> > lets assume that to be the case.
> >
> > but then in dlg_db_handler.c , load_dialog_info_from_db loads all
> dialogs from the DB, regardless of state.
> > so all dialogs in the DB ( ones that didnt get deleted yet... but were
> in state 5 ) get re-created in kamailio
> > upon startup.
> >
> > what this means is...
> > ( assume starting with empty DB )
> >
> > I start kamailio, make some calls... they get synced to the DB.
> > I end the calls,  kamailio removes from dialogs module internal hash,
> but the sync to DB hasnt happened yet.
> >
> > I kill kamailio ( or crash .. whatever )....  restart kamailio and it
> re-loads all those dialogs
> > and thinks they are still active calls.
> >
> > Im SURE Im missing something here, because it seems to be VERY common to
> use dialogs for channel limiting..
> > maybe not so much using cassandra db behind the scenes, but as of yet
> ... Im still yet to find anything that makes me thing this is db_cassandra
> mis-behaving.
> >
> > if im wrong, please point me in the right direction.
> >
> > Jay
> >
> >
> >
> >
> > On 24 February 2014 17:54, jay binks <jaybinks at gmail.com> wrote:
> >>
> >> Am I REALLY the only person who has ever run into this !?
> >>
> >>
> >> On 19 February 2014 14:08, jay binks <jaybinks at gmail.com> wrote:
> >>>
> >>> Hi all, im using the dialog module with db_cassandra backend..
> >>> I dont believe this issue is related to cassandra, but its worth
> mentioning anyways.
> >>>
> >>> so... I run kamailio, make calls, see dialogs in the DB..
> >>> and I Can use "kamctl mi dlg_list" and see that dialogs go away when I
> hangup a call..
> >>>
> >>> When I query the DB Backend, I still see the queries, but they have a
> state of 5.
> >>> I Initially thought this was a bug, but it seems dialogs in state 5
> get cleaned up after a period.
> >>> so I moved on.
> >>>
> >>> now , lets restart kamailio..
> >>> kamailio loads all dialogs on startup, after kamailio starts I call
> "kamctl mi dlg_list" again, and it shows all my dialogs from the DB.   they
> DO show as "State 5"
> >>> but for some reason, these dialogs appear to stick around for a long
> time, and the bigger issue it causes me is that my channel limiting ( using
> get_profile_size ) seems to consider these dialogs ( in state 5 ) as being
> active calls.
> >>>
> >>> Please someone point me in the right direction... :)
> >>>
> >>> what am I doing wrong ?
> >>> ( or is this a bug somewhere )
> >>>
> >>> Sincerely
> >>>
> >>> Jay
> >>
> >>
> >>
> >>
> >> --
> >> Sincerely
> >>
> >> Jay
> >
> >
> >
> >
> > --
> > Sincerely
> >
> > Jay
> >
> >
> > _______________________________________________
> > sr-dev mailing list
> > sr-dev at lists.sip-router.org
> > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
> >
> >
> > --
> > Daniel-Constantin Mierla - http://www.asipto.com
> > http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
> >
> >
> > _______________________________________________
> > 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
> >
>
>
>
> --
> Sincerely
>
> Jay
>

-- 
Sincerely

Jay
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