[Zope] Re: [Warning] Potential serious Session/TemporaryStorage problem

[Dennis Allison]

Dieter --
   
   Which version of Filestorage/TemporaryStorage has this error?  Are you
   going to do a patch?  

   I'm also tracking a problem with Temporary Stroage which might be
   related.  I use session variables rather heavily and, occasionally,
   a running session loses its variables.  The problem manifests
   itself as a KeyError when referencing the session.   Other sessionss
   in the same Zope appear unaffected.  And it is not a timeout problem.
   

On Wed, 1 Sep 2004, Dieter Maurer wrote:

> Dieter Maurer wrote at 2004-9-1 20:45 +0200:
> > ...
> >Recently, strange session related "Conflict Errors" have been reported.
> >
> >The strange thing about these conflicts is that the timestamp
> >when the object was read from the ZODB is *AFTER* the timestamp
> >the object has at commit time. Apparently, the object state
> >jumped backward in time. When the object is modified, this
> >results in a "ConflictError". However, when the object is only
> >read, then old data is used -- probably without anyone noticing
> >this.
> > ...
> >I will try to localize the place where this jumping backward in
> >time happens.
> 
> The implementors of "ZODB.FileStorage.FileStorage.store"
> and "tempstorage.TemporaryStorage.TemporaryStorage.store"
> have simply been a bit confused about what is old and what is new:
> the two values are interchanged: "was" is the serial at commit time,
> "now" is the serial at load time. Thus, the "was serial" must be larger
> than the "now serial".
> 
> -- 
> Dieter
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