[11u] Proposal: Switch jdk11u development to Git/Skara with 11.0.13 cycle

[Lindenmaier, Goetz]

Hi,

could you please start a mail thread of its own
for discussing the move of 8u to git?

This mail thread is about moving 11u to git.

Best regards,
  Goetz.



> -----Original Message-----
> From: Andrew Hughes <gnu.andrew at redhat.com>
> Sent: Thursday, February 25, 2021 6:07 AM
> To: Langer, Christoph <christoph.langer at sap.com>
> Cc: Andrew Haley <aph at redhat.com>; jdk-updates-dev at openjdk.java.net;
> jdk8u-dev at openjdk.java.net; Lindenmaier, Goetz
> <goetz.lindenmaier at sap.com>; Severin Gehwolf <sgehwolf at redhat.com>
> Subject: Re: [11u] Proposal: Switch jdk11u development to Git/Skara with
> 11.0.13 cycle
> 
> On 08:38 Fri 12 Feb     , Langer, Christoph wrote:
> > Hi Andrew,
> >
> > you have valid concerns which I hope we can get sorted out until the
> proposed 11u switch. Let me answer in detail:
> >
> > > I have still not seen any answer to my question of how a bulk update is
> > > pushed for the CPU.
> >
> > I think generally this is kind of answered. For the 11u <-> 11u-dev merges
> we can use a facility called "Merge PR", something like people used to merge
> jdk16 back into jdk [0].
> > Although I've not yet done it myself and will need to talk to Skara folks to
> get it explained better, I think this is what we can use.
> >
> > For working on the CPU I hope to be able to use "git bundle" to distribute
> the state of work on vuln-dev (Similar to what we do with hg bundle now)
> and eventually push the release via a Merge PR. I will explore this in detail in
> the next weeks and see if it's bound to work. In case I don't see it working,
> I'd consider it a showstopper. So I'll update you on this soon, in time before
> the advised github switch.
> >
> > > My own attempts to backport to jdk13u suggest the tooling still needs
> > > work on this, or at least better documentation. [0]
> >
> > I think you have a point here. As far as I know the "git backport" command
> does not exist yet and also the process to backport a change by commenting
> "/backport" on the original change in the jdk repository is not activated yet.
> I've brought this up to the skara team and they said that they hope to be able
> to enable it soon [1]. At the moment a backport would work like
> documented in the manual steps of this link [2] - which is not too convenient.
> I'll approach Skara folks again about that.
> >
> 
> This all sounds like deploying this in just four months is too soon
> for me. Why not allow Skara to mature first, if we must use it at all?
> 
> Can we not just switch 11u to git only and retain the existing processes that
> work fine?
> 
> > > OpenJDK 16, the first release to use git during development, has not
> > > even been released yet. Why the rush?
> >
> > Well, I would not consider it to be in a rush, given the proposal of switching
> in about 4 months from now. But overall, to align processes, to me it seems
> favorable to go to git with 11u and we should not overly delay it. At that time
> JDK16 and its first update release 16.0.1 will have been delivered out of git
> (as well as a few jdk13u update releases).
> >
> 
> It's less git I'm concerned about, than that it seems to bring along
> Skara with it. I found jcheck painful enough with Mercurial. Skara
> terrifies me and seems to steal a lot of control away from us.
> 
> > > I don't see any reason at all to start altering 8u at such a late
> > > stage in its development.  All risk and no gain.
> >
> > That's a different discussion which I won't take part in as I'm not involved
> so much in 8u. The only point I have on that is that there's no reason to
> couple the decisions for 8 and 11, as was stated by Severin and Goetz already.
> >
> 
> No, I agree on that. 8u is quite different and doesn't suffer from the painfully
> slow monorepo 11u does.
> 
> > Best regards
> > Christoph
> >
> > [0] https://github.com/openjdk/jdk/pull/2392
> > [1] https://mail.openjdk.java.net/pipermail/skara-dev/2021-
> January/004051.html
> > [2] https://wiki.openjdk.java.net/display/SKARA/Backports#Backports-CLI
> >
> 
> --
> Andrew :)
> 
> Senior Free Java Software Engineer
> OpenJDK Package Owner
> Red Hat, Inc. (http://www.redhat.com)
> 
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