[OpenAFS-devel] diagnosing my problem with ubik elections... bug in ubik

[Derek Atkins]

Other people might have IP Addresses that are lower than their memory
addresses :)

-derek

"Neulinger, Nathan" <nneul@umr.edu> writes:

> Well, turns out, that change for lowestHost DID fix my entire problem...
> 
> Unfortunately, when I added debugging I changed a 
> 
> if (x)
> 	return 0;
> 
> to a 
> 
> if (x)
> 	debug
> 	return 0;
> 
> (I hate the fact that openafs code is unmaintainable with tabstop=4. That's
> what got me messed up there.)
> 
> as soon as I fixed that, it started working after the 75 (BIGTIME) second
> delay.
> 
> What I'd like to know is - how come no one else has been impacted by that
> lowestHost thing? what is different about my setup that it's affecting them
> - is no one else running 3 database servers on linux boxes perhaps?
> 
> I'm going to back out all my debugging changes and come up with a minimal
> set of changes to verify that this indeed corrects the problem. 
> 
> -- Nathan
> 
> > -----Original Message-----
> > From: Neulinger, Nathan 
> > Sent: Tuesday, April 03, 2001 12:08 PM
> > To: 'Ken Hornstein'
> > Cc: 'openafs-devel@openafs.org'
> > Subject: RE: [OpenAFS-devel] diagnosing my problem with ubik
> > elections... bug in ubik 
> > 
> > 
> > Yeah, I've been waiting long enough... learned that much 
> > about the protocol already, head about to explode from it too...
> > 
> > I've let it sit overnight in a couple cases, it's just 
> > looping forever. I've about got it tracked down, has taken me 
> > a while to get enough debugging added to ubik stuff to where 
> > I can understand exactly how it works.
> > 
> > -- Nathan
> > 
> > > -----Original Message-----
> > > From: Ken Hornstein [mailto:kenh@cmf.nrl.navy.mil]
> > > Sent: Tuesday, April 03, 2001 12:03 PM
> > > To: Neulinger, Nathan
> > > Cc: 'openafs-devel@openafs.org'
> > > Subject: Re: [OpenAFS-devel] diagnosing my problem with ubik
> > > elections... bug in ubik 
> > > 
> > > 
> > > >Once I changed that, the lowestHost calculation is looking 
> > > much better.
> > > >Still not syncing up cause no one is ever sending a yes 
> > > vote, but I'm still
> > > >looking at that. 
> > > 
> > > Just FYI: as part of the protocol, no one can send a "yes" 
> > > vote for BIG
> > > seconds after startup (I think "BIG" is something like 90, 
> > but I don't
> > > remember).  If you're restarting it before that timer elapses, then
> > > that might be part of the problem.
> > > 
> > > I have a document which describes the basic Ubik protocol which IMHO
> > > is essential for debugging these sorts of things; Derrick, 
> > > maybe it should
> > > be added to the base distribution?  (If it isn't already).
> > > 
> > > --Ken
> > > 
> > 
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-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord@MIT.EDU                        PGP key available