that looks pretty much like modules are being reloaded in process.   
Either get web.py to not reload the "sqlalchemy" modules, or if it has
to, then get it to fully load "sqlalchemy" completely.   I see that
"reload(mod)" right in the stack trace there.




On 6/26/14, 1:14 PM, Dustin Oprea wrote:
> I'm using SQLAlchemy with web.py, and have used it many times in the
> past. I'm working on a project using gevent/greenlets, and everything
> has been fine for a couple of months, until today.
>
> Suddenly, I'm getting these at a time when I'm not even receiving any
> requests. Does anyone have any advice or steps to troubleshoot?
>
>     Traceback (most recent call last):
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     237, in process
>         return p(lambda: process(processors))
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     565, in processor
>         h()
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     661, in __call__
>         self.check(mod)
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     680, in check
>         reload(mod)
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/reflection.py",
>     line 58, in <module>
>         class Inspector(object):
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/reflection.py",
>     line 136, in Inspector
>         @inspection._inspects(Connectable)
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/inspection.py",
>     line 84, in decorate
>         "registered" % type_)
>     AssertionError: Type <class
>     'sqlalchemy.engine.interfaces.Connectable'> is already registered
>
>     Traceback (most recent call last):
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     237, in process
>         return p(lambda: process(processors))
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     565, in processor
>         h()
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     661, in __call__
>         self.check(mod)
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     680, in check
>         reload(mod)
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/reflection.py",
>     line 58, in <module>
>         class Inspector(object):
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/reflection.py",
>     line 136, in Inspector
>         @inspection._inspects(Connectable)
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/inspection.py",
>     line 84, in decorate
>         "registered" % type_)
>     AssertionError: Type <class
>     'sqlalchemy.engine.interfaces.Connectable'> is already registered
>
>     Traceback (most recent call last):
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     237, in process
>         return p(lambda: process(processors))
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     565, in processor
>         h()
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     661, in __call__
>         self.check(mod)
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     680, in check
>         reload(mod)
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/reflection.py",
>     line 58, in <module>
>         class Inspector(object):
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/reflection.py",
>     line 136, in Inspector
>         @inspection._inspects(Connectable)
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/inspection.py",
>     line 84, in decorate
>         "registered" % type_)
>     AssertionError: Type <class
>     'sqlalchemy.engine.interfaces.Connectable'> is already registered
>
>     Traceback (most recent call last):
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     237, in process
>         return p(lambda: process(processors))
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     565, in processor
>         h()
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     661, in __call__
>         self.check(mod)
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     680, in check
>         reload(mod)
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/reflection.py",
>     line 58, in <module>
>         class Inspector(object):
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/reflection.py",
>     line 136, in Inspector
>         @inspection._inspects(Connectable)
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/inspection.py",
>     line 84, in decorate
>         "registered" % type_)
>     AssertionError: Type <class
>     'sqlalchemy.engine.interfaces.Connectable'> is already registered
>
>     Traceback (most recent call last):
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     237, in process
>         return p(lambda: process(processors))
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     565, in processor
>         h()
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     661, in __call__
>         self.check(mod)
>       File
>     "/usr/local/lib/python2.7/dist-packages/web/application.py", line
>     680, in check
>         reload(mod)
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/reflection.py",
>     line 58, in <module>
>         class Inspector(object):
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/reflection.py",
>     line 136, in Inspector
>         @inspection._inspects(Connectable)
>       File
>     "/usr/local/lib/python2.7/dist-packages/sqlalchemy/inspection.py",
>     line 84, in decorate
>         "registered" % type_)
>     AssertionError: Type <class
>     'sqlalchemy.engine.interfaces.Connectable'> is already registered
>
>
>
>
> Dustin
>
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