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David Lenwell
dlenwell at gmail.com
Mon Nov 26 14:50:08 EST 2007
I did .. and then it stopped and I can't explain why .. our software is in alpha right now until I finish our custom session solution .. we won't go into production until I have this handled. I messed with file permission, forcing different file dbm file names .. it eventually works but like you said it hangs for about 4 minutes with no explanation. The database load is fine if you set it up right.. We played with running a separate version of mysql cluster across all our web servers since it keeps its data in memory, its pretty fast but I think we are transitioning to a shared memcache solution .. its all still in the air really until I can make something rock solid .. downtime isn't really an option. On Nov 26, 2007, at 11:29 AM, Harish Agarwal wrote: > Did you also have problems with _apache._global_lock? For now, I'm > not too worried about the database load (if necessary we can > transition to an in memory session handler as well), I'd just like > to understand the source of the problems as I have a feeling this > problem will always show up (as the other David has noticed this > problem with FileSession as well) as long as we're inheriting our > session handler from BaseSession. > > Thanks, > Harish > > On Nov 26, 2007, at 11:21 AM, David Lenwell wrote: > >> yeah .. its very broken for me too .. What I am working on is my >> own session handler.. I don't feel that mysql is a valid >> replacement because it puts unnecessary load on your database server. >> >> We are debating on open sourcing the code I am working on. if I win >> the argument that open source can be good for us then I will >> contribute my code to the project. >> >> >> On Nov 26, 2007, at 10:55 AM, David Janes wrote: >> >>> All I can say is "we too" -- we're using FileSession. We have not >>> been >>> able to come up with a cure, though we've minimized use of sessions >>> which brings the frequency down significantly. >>> >>> Regards, etc... >>> David >>> >>> On Nov 26, 2007 1:39 PM, Harish Agarwal <harish at octopart.com> wrote: >>>> I'm using session handling with ModPython 3.3.1. Originally I was >>>> using DbmSession and have since transitioned to a custom MySQL >>>> Session >>>> handler. With both session types, however, I've noticed that >>>> session >>>> initialization intermittently hangs (not forever, but takes as >>>> long as >>>> four minutes to complete), at a low-ish (a handful of times every >>>> hour, while receiving, say, on order of a thousand or so requests >>>> every hour) frequency which seems to scale with the amount of >>>> traffic >>>> we're receiving. I had read that long DbmSession cleanups can >>>> cause >>>> problems, which is why I transitioned to the MySQL system, which >>>> takes >>>> < 1 second to complete, but I'm still noticing the long session >>>> init >>>> times. >>>> >>>> >>>> I put some debugging statements into the code and it seems to be >>>> related to session locking. In particular, it is this function >>>> call >>>> in the lock method of the BaseSession class: >>>> >>>> >>>> _apache._global_lock(self._req.server, self._sid) >>>> >>>> >>>> which is taking some time to complete. I'm not familiar with >>>> _apache._global_lock (is it used to apply a mutex lock to the >>>> session?) and am having trouble finding information describing its >>>> usage - but it seems likely that this is the root cause. In the >>>> past >>>> I've had problems with session locking but have since >>>> transitioned the >>>> code to ensure that only one session is created per request, as >>>> such: >>>> >>>> if not hasattr(req,'session'): >>>> req.session = Session.MySQLSession(req) >>>> >>>> >>>> Can anyone tell me if this kind of behavior is normal or is >>>> indicative >>>> of some common configuration or coding error? Any help would be >>>> greatly appreciated. >>>> >>>> Thanks, >>>> -Harish >>>> _______________________________________________ >>>> Mod_python mailing list >>>> Mod_python at modpython.org >>>> http://mailman.modpython.org/mailman/listinfo/mod_python >>>> >>> >>> >>> >>> -- >>> David Janes >>> Founder, BlogMatrix >>> http://www.blogmatrix.com >>> http://blogmatrix.blogmatrix.com >>> _______________________________________________ >>> Mod_python mailing list >>> Mod_python at modpython.org >>> http://mailman.modpython.org/mailman/listinfo/mod_python >> > > _______________________________________________ > Mod_python mailing list > Mod_python at modpython.org > http://mailman.modpython.org/mailman/listinfo/mod_python
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