[Zope] Strange session behavior [confirmed bug]

[Chris McDonough]

Thanks for tracking this down!  I will take a quick look but please do
file a collector issue if possible.

On Fri, 2003-01-24 at 00:52, Andrew Athan wrote:
> 
> How do I "officially" notify Zope maintainers of a possible bug?
> 
> My theory is that these strange sessioning bugs are in part because
> _getCurrentBucket() is called by get(x), and sometimes expires objects.
> However, it expires them without taking into account that we are
> currently asking for "x".
> 
> Therefore, given the discrete timeslice behavior of the expiration
> algorithm, we get prematurely expired because x is in the old slice!
> 
> A.
> 
> -----Original Message-----
> From: zope-admin@zope.org [mailto:zope-admin@zope.org] On Behalf Of
> Andrew Athan
> Sent: Thursday, January 23, 2003 11:21 PM
> To: 'Chris McDonough'
> Cc: zope@zope.org
> Subject: RE: [Zope] Strange session behavior
> 
> 
> 
> Zope is definitely not crashing.  The behavior is more apparent when I
> set the limits in the session data manager (time & # of subobjects) to
> 0.  Strange, since these are supposed to be special values that mean
> infinity.
> 
> I bet this is a problem in OOBtree or in the bucketing mechanism of
> Transience.py
> 
> A.
> 
> 
> -----Original Message-----
> From: zope-admin@zope.org [mailto:zope-admin@zope.org] On Behalf Of
> Chris McDonough
> Sent: Thursday, January 23, 2003 11:05 PM
> To: Andrew Athan
> Cc: zope@zope.org
> Subject: RE: [Zope] Strange session behavior
> 
> 
> Hi Andrew,
> 
> Is it possible that Zope is crashing during the test?  Might you try
> pointing the session data manager at a different transient object
> container (one not in the temp folder)?
> 
> On Thu, 2003-01-23 at 22:48, Andrew Athan wrote:
> > Stranger and stranger.  When the objects disappear, there is no slew
> > of calls to the deleteScript ... it is looking like the session data 
> > manager just goes "poof"
> >  
> > A.
> > 
> > -----Original Message-----
> > From: zope-admin@zope.org [mailto:zope-admin@zope.org] On Behalf Of
> > Andrew Athan
> > Sent: Thursday, January 23, 2003 10:32 PM
> > To: zope@zope.org
> > Subject: RE: [Zope] Strange session behavior
> > 
> > 
> > Further information:
> >  
> > By printing request['_ZopeId'] I am able to see that the session ID is
> 
> > being maintained even after the session data disappears (thus, cookies
> 
> > are working fine).  The problem is probably NOT in the browser ID
> > manager.
> >  
> > By monitoring the transient object folder after setting all timeouts
> > to 0 and using "ab -n 1000 http://localhost:8080/debug_test" to hit my
> 
> > little debug ZPT I see that the number of objects in the transient
> > folder is periodically reset to 0 through no obvious action of my own.
> >  
> > Any clues or known bugs here?
> >  
> > Andrew Athan
> > 
> > -----Original Message-----
> > From: zope-admin@zope.org [mailto:zope-admin@zope.org] On Behalf Of
> > Andrew Athan
> > Sent: Thursday, January 23, 2003 9:49 PM
> > To: zope@zope.org
> > Subject: [Zope] Strange session behavior
> > 
> > 
> >  
> > Hi, I'm using Zope 2.6.1b1 (but the same behavior is exhibited by
> > 2.6.0) and IE6 on XP.  Before I spend a long time debugging this I 
> > thought I'd ask the list:
> >  
> > Either IE's cookie handling (doubt it, since I tried this with highly
> > permissive privacy settinngs) or Zope's browser id manager, or Zope's 
> > session manager or Zope's transient objects folder is misbehaving.
> >  
> > Symptom:  Session data is periodically and intermittently lost within
> > a period of time much much shorter than the transient object timeout.
> >  
> > To test this I use a single IE window reloading the very same
> > "test.html" ZPT that simply checks for the existance of the key 'foo' 
> > in REQUEST.SESSION and reports the result (and sets it to 1 always).
> >  
> > Preliminary evidence is that the problem is exacerbated by concurrent
> > request handling.  I test this using a windows client that utilizes 
> > the WinHTTP COM+ object to generate requests running on a separate 
> > machine (no chance of IE stepping on itself).
> >  
> > Of possible relevance is that external python methods are invoked to
> > fulfill the WinHTTP generated requests.
> >  
> > Any initial hints on where to look?
> >  
> > Thanks,
> > Andrew Athan
> >  
> > 
> 
> 
> 
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