We're occasionally seeing this exception thrown out of
mapper.configure_mappers when using SQLSoup in our webapp:
File
"/home/glados/.virtualenvs/pod-glance/local/lib/python2.7/site-packages/sqlsoup.py"
, line 455, in __getattr__
return self.entity(attr)
File
"/home/glados/.virtualenvs/pod-glance/local/lib/python2.7/site-packages/sqlsoup.py"
, line 452, in entity
return self.map_to(attr, tablename=attr, schema=schema)
File
"/home/glados/.virtualenvs/pod-glance/local/lib/python2.7/site-packages/sqlsoup.py"
, line 363, in map_to
mapper_args
File
"/home/glados/.virtualenvs/pod-glance/local/lib/python2.7/site-packages/sqlsoup.py"
, line 172, in _class_for_table
for k in mappr.iterate_properties:
File
"/home/glados/.virtualenvs/pod-glance/local/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py"
, line 1819, in iterate_properties
configure_mappers()
File
"/home/glados/.virtualenvs/pod-glance/local/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py"
, line 2677, in configure_mappers
for mapper in list(_mapper_registry):
File "/usr/lib/python2.7/weakref.py", line 327, in iterkeys
for wr in self.data.iterkeys():
RuntimeError: dictionary changed size during iteration
I saw a previous thread about this
<https://groups.google.com/forum/#!searchin/sqlalchemy/%22RuntimeError$3A$20dictionary$20changed$20size$20during$20iteration%22/sqlalchemy/Qcwzn_GqUdQ/7n28bZqfPKYJ>
and
indeed we are creating new SQLSoup instances per request not per process.
But I also note that since then, it seems that sqlalchemy does use
a _CONFIGURE_MUTEX to avoid unsynchronized reference to _mapper_registry.
Any idea what might be causing this?
Thanks,
Chung
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