[ZODB-Dev] Disconected Error

[Guido van Rossum]

> I keep getting Disconnected Errors with my ZEO. They always arise
> when I use the undo tab in the ZMI. I see from searching the mailing
> lists that I am not the only one to experience these errors arising
> from undo behaviour. But, as far as I can see, there is no
> indication in the list archives of the root cause of this problem
> and how to get around it. When I mount the Data.fs directly, without
> using the ZEO, there is no problem. Can anyone tell me what is going
> wrong?

I'm out of my league here, but I believe Undo can take very long (it
has to crawl through the entire database looking for relevant
records).

> My system configuration is:
>   
>   Zope Version: (Zope 2.6.1 (source release, python 2.1, linux2), python 2.1.3, sunos5)
>   ZEO: 2.0.1b1
>   Python Version: 2.1.3 (#2, Aug 31 2002, 19:15:40) [GCC 2.95.3 20010315 (release)]
>   System Platform: sunos5 
> 
> Sample traceback:
> 
>   Time  2003/02/28 13:32:16.014 GMT+1
>   User Name (User Id) admin (admin)
>   Request URL http://hal.dfki.uni-sb.de:19080/plone/portal_navigation/manage_UndoForm
>   Exception Type DisconnectedError
>   Exception Value
> 
>   Traceback (innermost last):
> 
>       * Module ZPublisher.Publish, line 98, in publish
>       * Module ZPublisher.mapply, line 88, in mapply
>       * Module ZPublisher.Publish, line 39, in call_object
>       * Module Shared.DC.Scripts.Bindings, line 252, in __call__
>       * Module Shared.DC.Scripts.Bindings, line 283, in _bindAndExec
>       * Module App.special_dtml, line 174, in _exec
>       * Module App.Undo, line 93, in undoable_transactions
>       * Module ZEO.ClientStorage, line 745, in undoInfo
>       * Module ZEO.ServerStub, line 130, in undoInfo
>       * Module ZEO.zrpc.connection, line 317, in call
>       * Module ZEO.zrpc.connection, line 376, in wait

This means that the ZEO server disconnected you.  Can you look in the
server logs to see if there's a reason?  If necessary, increase the
logging level.

--Guido van Rossum (home page: http://www.python.org/~guido/)