The following is a list of questions (and, hopefully, answers) regarding the "Vancouver Prospectus", the proposal for Debian release management intended to take effect for etch (sarge+1), and assembled by the Debian release managers and archive administrators at a meeting in Vancouver, Canada in early March 2005.
- Why is the permitted number of buildds for an architecture restricted to 2 or 3?
- Steve Langasek seems to be saying the arch would be too slow to usefuly run many of the packages, would require more trust, slow down RC fix propigation... see ["1"] (ddaniels)
- How is it that none of the four architectures to be released with etch (i386, powerpc, ia64, amd64) have the bare minimum 2 buildds, and yet all are still considered releasable? (N+1 buildds are required; presumably N is 1 rather than 0, since most developers will not upload a binary package for each of the four architectures every time they release a new source package.)
- It seems that the minimum already includes one redundant machine. (ddaniels)
- How will it be determined if a newly proposed architecture has a large enough user base to consist of 10% of all mirror downloads before that new architecture is actually added to the mirrors?
- It like it'll be an ad-hoc survey of the mirrors (but how is that done?). (ddaniels)
- Three bodies (Security, System Administration, Release) are given independent veto power over the inclusion of an architecture.
- Does the entire team have to exercise this veto for it to be effective, or can one member of any team exercise this power effectively?
It seems to be the entire team that would need to veto as it's a concern that there won't be enough man hours to do the work. Iirc somone said it was a "common sence" no one to support it = veto. Steve Langasek said ["1"] "It's expected that each team would exercise that veto as a team, by reaching a consensus internally." (ddaniels)
- Is the availability of an able and willing Debian Developer to join one of these teams for the express purpose of caring for a given architecture expected to mitigate concerns that would otherwise lead to a veto?
- I would expect so, but the time for training needs to be available, and seen worthwhile. I suspect that someone would have to demonstrait their devotion to the team's work (like Jorg did?) and then arange to be trained. (ddaniels)
- How often can/should these bodies be petitioned for a reconsideration of their veto in light of underlying changes in circumstance?
- I'd guess when it's obvious that the underlying circumstances have changed. E.g. when a new member joins a team, or when opening r-c bug allowed into testing.... (ddaniels)
- How will the exercise of a veto be communicated to the Project?
- I'm guessing it'd be first through the porters, then possibly d-d, and maybe even d-d-a. I'd hope it'd be first porters, and then d-d-a. (ddaniels)
- The guidelines for eligibility as a released or mirrored architecture, and for inclusion in SCC, could be initially met, but later fail. For example, an architecture could fall below the 98% up-to-date mark. Does this spell automatic expulsion from the slate of releasable architectures? Similarly, for how long are the petititions for inclusion in SCC (5 developers and 50 users) assumed to remain valid?
- I'm guessing the biggest hold backs would be man hours for the teams, and archive space. So that would mean when space and/or man hours runs low they'd be looking to drop architectures. When space and/or man hours are available they'd be more receptive to adding architectures. (ddaniels)
What problems does the VancouverProspectus aim to solve? Mirror network space, d-i releases (wasn't a blocker before), security updates (mostly a kernel problem?), RC-bug fix "hand-holding" on the buildd's... Guesses:
- buildd system scaling (almost fixed?)
- setting up and maintaining buildd's (offers for help have been made)
- Archive Space (Alternative fixes include Ubuntu Universe model, better compression...)
- Time removing old versions (i.e. stale binaries) (Alternatives include automated scc for packages, giving recognized porters the ability to remove stale binaries)
- Space for out of date source (Alternatives include automated scc for packages)
- Mirror Bandwidth (Alternatives include rsync, making arch's selectable...)
- d-i support (wasn't a blocker before)
Security updates (http://lists.debian.org/debian-vote/2005/03/msg00683.html)
- "hand-holding" buildd's (mostly was a problem for kernels and shouldn't be for sarge)
- Setting up and maintaining buildd's
- Waiting for slow arch's to build (just be a lucky side effect)
- RC-bug fix "hand-holding" on buildd's (Alternatives include leaving it to the package maintainers, asking for help...)
- How will SCC releases be made? CD image only, scc.d.o only, not at all, added when ready to the mirror network? (ddaniels)
With the tier-1 release if pre-freeze tracked, and few RC bugs according to http://lists.debian.org/debian-release/2005/03/msg00168.html but where will the packages sit? (ddaniels)
- Will tier-1 releases (i.e. etch) block uploads for scc RC fixes? If changes needed for scc's are blocked then, will the Stable Release Managers accept package changes which are just intended to support a scc or other architecture? (ddaniels)
- I'm guess it's a package maintainer decision that could risk it not being included. I'd imagine the release teams will continue to allow RC fixes even if it is arch specific. (ddaniels)
Does VancouverProspectus solve other DebianRelease problems, such as quasi-exponential growth of packages? (["EGallego"])
- Exluding a "universe" package from a release due to bugs is easier than exlucing an architecture. I'd imagine lots of space would have to be available for archive growth and that removing extra architecures has done this. Some numbers might be nice though. (ddaniels)
["1"] <20050319024440.["GB11330"]@mauritius.dodds.net> http://lists.debian.org/debian-vote/2005/03/msg00741.html