Re: closed connection during Zope2 request

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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