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

[Dennis Allison]

I think I have tracked down the problem here.  It was one program that did
not follow the usual copy-out modify copy-in mechanism required to trigger 
persistent stores (see Transcience API in The Zope Book).  I fixed that
and the problem seems to have (mostly) gone away although we are still
testing.


On Thu, 2 Sep 2004, Dieter Maurer wrote:

> Dennis Allison wrote at 2004-9-1 14:44 -0700:
> >Dieter --
> >   
> >   Which version of Filestorage/TemporaryStorage has this error?  Are you
> >   going to do a patch?  
> 
> As I have reported in the message you answered to, this
> is only a display problem: I have not discovered a serious
> problem -- the problem appears only in the "ConflictError" message.
> The two serials have been interchanged.
> 
> >   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.
> 
> Until today, I thought this were impossible.
> However, today, a colleague reported that he has seen
> occurrencies where individual session variables have disappeared
> (while others did not). He is has analysed the access logs
> and is sure that all session variable have been set.
> 
> Thus, almost surely, something is wrong with sessions or
> temporary storage. We just do not yet know what.
> 
> -- 
> Dieter
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