[ZODB-Dev] Re: BTrees strangeness (was [Zope-dev] Zope 2.X BIG Session problems - blocker - our site dies - need help of experience Zope developer, please)

[michael]

On 10/03/2004, at 6:29 AM, Chris McDonough wrote:

> On Tue, 2004-03-09 at 06:36, Alex V. Koval wrote:
>> I have enabled 400 error_log ex exceptions to keep, and during 3 days 
>> I
>> got 2 errors
>> on the site:
>>
>> Time	Username (User Id)	Exception	
>> 16:35:01 	Anonymous User (None) 	KeyError: 1078763620 	
>> 21:59:05 	Anonymous User (None) 	KeyError: 1078696720

I have been trying on and off to recreate this error via brute force 
loading of the simplest possible site that uses sessions. I failed to 
see this particular KeyError *until* I tried reading a session variable 
from standard_error_message. Now I can recreate these quite frequently.

My *guess* is that this error happens when a ZODB conflict error is 
thrown from Transience while rendering standard_error_message.

I need to do some more testing and probably worth detailing just how 
I'm doing the tests. Currently using Zope 2.7.0, Python 2.3.3. Yet to 
try with the Transience branch. Or use FileStorage. Just happy to have 
actually provoked this error in some kind of test arena :-)

Michael