I'm trying to use SQLObject (0.9.3) in conjunction with the threading
module. I'm at a bit of a loss as to where to start debugging this one,
so I'll present my mini-example and see if others can help. This is
using MySQL, with MySQLdb 1.2.2 (latest version) & SQLObject 0.9.3.
class A(SQLObject):
class sqlmeta:
createSQL = {'mysql': 'ALTER TABLE a ENGINE InnoDB'}
cacheValues = False
value = IntCol(alternateID=True)
def thr1():
for i in range(1000):
try:
A(value=1)
except dberrors.DuplicateEntryError:
a = A.byValue(1)
for i in range(nthreads):
t = threading.Thread(target=thr1,args=())
t.start()
If I start 1 thread (nthreads=1), this completes fine.
If I start many threads (nthreads=10), I get a bunch of exceptions, with
more exceptions, and quicker, if nthreads is large, like 100.
The MySQLdb error:
Exception _mysql_exceptions.ProgrammingError: (2014, "Commands out of
sync; you can't run this command now") in <bound method
Cursor.__del__ of <MySQLdb.cursors.Cursor object at 0x2a99c68ad0>>
ignored
is pretty consistent, and sometimes I get an "InterfaceError" from
sqlobject.
If I change "a = A.byValue(1)" to "pass" the exceptions go away...it
seems like the exception puts the connection in a bad state.
If I get rid of the InnoDB alter table (and thereby lose row-based
locking) then I get lots of the MySQLdb exceptions, with the InnoDB
alter table I get only a few.
If I change cacheValues to True, w/ InnoDB, I get no significant
increase in the number of these exceptions, but they do still occur.
I don't see anything especially suspicious if I enable debug and
debugOutput.
This seems a little similar to the errors at:
http://sourceforge.net/tracker/index.php?func=detail&aid=1407684&group_id=74338&atid=540674
but I checked the 0.9.3 code and this patch is applied.
Can anyone offer any insight?
Thanks,
nathan
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