[OpenAFS] Re: [OpenAFS-devel] 1.6 and post-1.6 OpenAFS branch management and schedule

Derrick Brashear shadow@dementia.org
Thu, 17 Jun 2010 08:24:05 -0400

Considering it a showstopper when you admit one graph earlier that  
you're already running with a patched tree seems a bit overblown,  
perhaps? The tree is now gold and patches may no longer be applied?


On Jun 17, 2010, at 3:30 AM, Rainer Toebbicke <rtb@pclella.cern.ch>  

> Russ Allbery schrieb:
>> I'm aware of the following (largish) things that we want to  
>> deprecate or
>> remove:
>> * --enable-fast-restart and --enable-bitmap-later are earlier  
>> attempts to
>>  solve the problem that is solved in a more complete way by demand
>>  attach.  Demand attach will be available in 1.6 but not enabled by
>>  default.  These two options will conflict with demand-attach; in  
>> other
>>  words, you won't be able to enable either of them and demand  
>> attach at
>>  the same time.
>>  At the point at which we make demand attach the default, rather than
>>  optional behavior, I believe we should remove the code for these two
>>  flags.  I think that should be for either 1.10 or 2.0 based on
>>  experience with running 1.6 in production.  In the meantime,  
>> please be
>>  aware that most of the developers don't build with those flags by
>>  default and the code is not heavily tested.
> I'm concerned about removing the code for fast-restart and bitmap- 
> later just because DAFS becomes the default.
> We've been running with our own "on-demand-attach" since 5-6 years  
> in 1.2 and 1.4 with perfect satisfaction, and given its size and  
> impact on the code I'd rather wait until DAFS gets a decent share of  
> debugging before considering to move to it.
> On the other hand, salvaging a complete file server just because of  
> a crash is not an option, and removing anything that's required for  
> it, be it fast-restart, bitmap-later or whatever, becomes a show- 
> stopper!
> -- 
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 
> =-=-=-=-=
> Rainer Toebbicke
> European Laboratory for Particle Physics(CERN) - Geneva, Switzerland
> Phone: +41 22 767 8985       Fax: +41 22 767 7155
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