[ZODB-Dev] another reason to stop supporting versions

[Christian Theune]

Hi,

Am Dienstag, den 24.04.2007, 17:01 -0400 schrieb Jim Fulton:
> I'm 99.9% sure that version commit and abort are broken in ZODB.DB.   
> The commit methods in CommitVersion, and AbortVersion (and  
> TransactionalUndo) call invalidate on the databse too soon -- before  
> the transaction has committed.  This can have a number of bad  
> effects, including causing inconsistent data in connections.
> 
> An argument for keeping version in the past was that they "worked".   
> Well, I think they don't work and I'm not interested in writing the  
> test to fix them.  Is anyone else?

Nope. However. We deprecated versions in Zope 2 a while ago disabling
the ability to add new versions but keeping existing versions alive.

We have to tell people what to do before the next update of Zope that
includes this change so they do not get locked out of existing data.

Unfortunately we have no numbers on how many people use versions. I
think I'll raise that question on Zope users and the German users list
to get a feeling on how many people react.

Christian

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