On Sun, 28 May 2006 12:19:04 -0400, Michael Bayer <[EMAIL PROTECTED]> wrote:
creating the postgres engine with the separate QueuePool, like youre doing, is a good idea to get a better result here. the "threadlocal" strategy uses this silly "TLEngine" subclass which is only trying to do that old "engine.begin()/engine.commit()" thing, which id rather get rid of, as soon as people tell me they can use the Transaction object that whole thing is gone. if youre having weird transactions hanging open types of problems i would suspect that might be where its happening, as it does try to maintain state (any chance I can get a fully working test program ?). The regular ComposedSQLEngine does not maintain any state (the underlying pool of course does).
But it seems that creating the pool on my own has its own share of problems because now even using plain strategy causes the deadlocks.
anyway your problem using the pool is just the "pool" argument not being propigated, and also there needed to be an exception raise for a bad URL, which if you SVN up to changeset 1533 youll get. the program below illustrates how to connect to postgres with your own pool:
Indeed this works but has the same deadlock problem now.
please try it out and let me know how it goes. the QueuePool in version 0.2 had to change slightly from its design in 0.1 to support "checkin/checkout" counters, as a result of the new requirement that people can explicitly call "close()" on a returned ConnectionFairy as opposed to waiting for __del__() to take care of things cleanly...other than that it is the same code. The regular ComposedSQLEngine in turn doesnt have anything to say about those connections, its totally stateless. anything producing a deadlock is something i need to know about and be able to reproduce ASAP....thanks.
Technically it's here: http://72.232.181.139/hg/stiq.cgi you'll need sqlalchemy, psycopg2, postgres8, twisted, nevow and formal to run the database tests. formal is here: svn://pollenation.net/forms/trunk but I doubt you have the time to prepare all these things. I'll try to see if I can manage to provide a test that only needs the first 4 elements of the list. Anyway the source in postgres.py module in stiq/storage/postgres.py can be used without the rest of the system and the unittests are pretty simple. HTH ------------------------------------------------------- All the advantages of Linux Managed Hosting--Without the Cost and Risk! Fully trained technicians. The highest number of Red Hat certifications in the hosting industry. Fanatical Support. Click to learn more http://sel.as-us.falkag.net/sel?cmd=lnk&kid=107521&bid=248729&dat=121642 _______________________________________________ Sqlalchemy-users mailing list Sqlalchemy-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sqlalchemy-users
