Hi ,
I noticed an unexpected behaviour when running two scheduler processes.
The situation is this :
A db with a table like :
db.define_table('taba',
Field('fa', unique=True, requires = IS_NOT_IN_DB(db,'taba.fa')),
Field('fb'))
a task (same function different args) distributed to the processes which
contains a :
ret = db.taba.validate_and_insert(fa='something', fb='somethingelse')
this generates an exception like so :
File "/opt/web2py/gluon/packages/dal/pydal/objects.py", line 737, in
validate_and_insert
response.id = self.insert(**new_fields)
File "/opt/web2py/gluon/packages/dal/pydal/objects.py", line 712, in
insert
ret = self._db._adapter.insert(self, self._listify(fields))
File "/opt/web2py/gluon/packages/dal/pydal/adapters/base.py", line 739, in
insert
raise e
IntegrityError: duplicate key value violates unique constraint "taba_fa_key"
DETAIL: Key (fa)=(something) already exists.
and task fails
This doesn't happen when running a single scheduler process so I guess the
two scheduler processes collide(….they try to write the same value to the
db at the same time……)
how do I fix this ? Why can't the two processes cooperate ? Am I limited to
running a single sched process ?
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