Re: Re: closed connection during Zope2 request

Connections have close callbacks.  Maybe you can add a close callback
that helps you debug where this is happening.  In your callback,
you'll probably want to inspect the stack frame to filter out expected
cases.

Jim

On Fri, Sep 30, 2016 at 8:02 AM, Mauro Amico <[email protected]> wrote:
> Thanks Jens, I know the common case, but I think that we are not in a common
> case.
> Objects "disconnected" are everytime different and not correlated to a
> custom package (that are very limited).
> The stack trace below is making me crazy ... but probably there is nothing
> strange on that, it's only something that I don't understand or that I don't
> see ...
>
> Any other hints?
>
> Thx again,
> Mauro.
>
> ...
> File
> "/opt/cache/buildout/eggs/zope.tal-3.5.2-py2.7.egg/zope/tal/talinterpreter.py",
> line 182, in __init__
>      self.program = program
> File
> "/opt/cache/buildout/eggs/Zope2-2.13.23-py2.7.egg/App/ZApplication.py",
> line 84, in __del__
>      self._jar.close()
> File
> "/opt/cache/buildout/eggs/ZODB3-3.10.5-py2.7-linux-x86_64.egg/ZODB/Connection.py",
> line 384, in close
>      self.setDebugInfo("%s" % traceback.format_stack())
>
> ----------------------------
> ...
> File
> "/opt/cache/buildout/eggs/Products.PlonePAS-5.0.9-py2.7.egg/Products/PlonePAS/plugins/ufactory.py",
> line 72, in _getPAS
>      return self.acl_users
> File
> "/opt/cache/buildout/eggs/Zope2-2.13.23-py2.7.egg/App/ZApplication.py",
> line 84, in __del__
>      self._jar.close()
> File
> "/opt/cache/buildout/eggs/ZODB3-3.10.5-py2.7-linux-x86_64.egg/ZODB/Connection.py",
> line 384, in close
>      self.setDebugInfo("%s" % traceback.format_stack())
>
> ----------------------------
> ...
> File
> "/opt/cache/buildout/eggs/Zope2-2.13.23-py2.7.egg/Products/PageTemplates/Expressions.py",
> line 88, in trustedBoboAwareZopeTraverse
>      path_items = list(path_items)
> File
> "/opt/cache/buildout/eggs/Zope2-2.13.23-py2.7.egg/App/ZApplication.py",
> line 84, in __del__
>      self._jar.close()
> File
> "/opt/cache/buildout/eggs/ZODB3-3.10.5-py2.7-linux-x86_64.egg/ZODB/Connection.py",
> line 384, in close
>
>
>
> On Thu, Sep 29, 2016 at 10:26 PM, Jens W. Klein <[email protected]>
> wrote:
>>
>> The most common case when this appears is when you set an persistent
>> object to an non persistent which is bound (as part of a dict, list or
>> attribute, ... or alike) to a global or a thread local variable and then
>> survives the request/response cycle.
>>
>> Most commonly here it a wrong usage of caches or some kind of registries.
>>
>> Jens
>>
>> On 2016-09-29 18:43, Mauro Amico wrote:
>> > Hi.
>> >
>> > We keep running into errors like "ZODB.Connection Shouldn't load state
>> > for ...", but they don't seem to be due to the usual persistent objects
>> > cached in ramcache
>> > or similar, because we have those errors in several different situations
>> > and on different installations with different custom packages.
>> >
>> > By analyzing on depth we noticed a weird behavior. It looks like the
>> > connection is somehow closed in the middle of a request. We tried to get
>> > more info saving the stack in the _debug_info of the connection with
>> > traceback.format_stack() everytime the connection close happens, in
>> > order to eventually print it in case of exception like "ZODB.Connection
>> > Shouldn't load state for ..."
>> >
>> > Below you can find some lines of the stack traces that we get when we
>> > run into the errors.
>> > What looks weird to us is that apparently it suddenly calls the __del__
>> > of a ZApplication.Cleanup instance that's on hold on the request,
>> > therefore closing the ZODB connection.
>> >
>> > Any ideas about why this is happening or about what else we can
>> > investigate on?
>> >
>> > Thanks in advance
>> >
>> > Mauro.
>> >
>> > ...
>> > File
>> >
>> > "/opt/cache/buildout/eggs/zope.tal-3.5.2-py2.7.egg/zope/tal/talinterpreter.py",
>> > line 182, in __init__
>> >     self.program = program
>> > File
>> > "/opt/cache/buildout/eggs/Zope2-2.13.23-py2.7.egg/App/ZApplication.py",
>> > line 84, in __del__
>> >     self._jar.close()
>> > File
>> >
>> > "/opt/cache/buildout/eggs/ZODB3-3.10.5-py2.7-linux-x86_64.egg/ZODB/Connection.py",
>> > line 384, in close
>> >     self.setDebugInfo("%s" % traceback.format_stack())
>> >
>> > ----------------------------
>> >
>> > ...
>> > File
>> >
>> > "/opt/cache/buildout/eggs/Products.PlonePAS-5.0.9-py2.7.egg/Products/PlonePAS/plugins/ufactory.py",
>> > line 72, in _getPAS
>> >     return self.acl_users
>> > File
>> > "/opt/cache/buildout/eggs/Zope2-2.13.23-py2.7.egg/App/ZApplication.py",
>> > line 84, in __del__
>> >     self._jar.close()
>> > File
>> >
>> > "/opt/cache/buildout/eggs/ZODB3-3.10.5-py2.7-linux-x86_64.egg/ZODB/Connection.py",
>> > line 384, in close
>> >     self.setDebugInfo("%s" % traceback.format_stack())
>> >
>> > ----------------------------
>> >
>> > ...
>> > File
>> >
>> > "/opt/cache/buildout/eggs/Zope2-2.13.23-py2.7.egg/Products/PageTemplates/Expressions.py",
>> > line 88, in trustedBoboAwareZopeTraverse
>> >     path_items = list(path_items)
>> > File
>> > "/opt/cache/buildout/eggs/Zope2-2.13.23-py2.7.egg/App/ZApplication.py",
>> > line 84, in __del__
>> >     self._jar.close()
>> > File
>> >
>> > "/opt/cache/buildout/eggs/ZODB3-3.10.5-py2.7-linux-x86_64.egg/ZODB/Connection.py",
>> > line 384, in close
>> >
>>
>>
>> --
>> Klein & Partner KG, member of BlueDynamics Alliance
>>
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>
>
>
>
> --
> Mauro
>
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-- 
Jim Fulton
http://jimfulton.info

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