It’s worth clarifying that CEP-10 has been broken up into phases, and this will 
be a roll-up branch for only the first portion.

I think we should be cautious about how we approach the idea of feature 
branches, as there is significant overhead for everyone as branches grow - the 
CEP-10 and CEP-14 work has had significant additional overhead introduced by 
this. There are also additional risks introduced during frequent or long term 
rebases, as they are hard to review.

I think the idea is good, but ideally if feature development is expected to 
span more than a single quarter it would be best to target phased incorporation 
into mainline, and not defer everything to the final moment. I think it also 
helps focus review, testing, documentation etc. to have manageable chunks of 
work merged long before any perceived deadline.


From: Jeremiah D Jordan <jeremiah.jor...@gmail.com>
Date: Friday, 17 September 2021 at 20:50
To: Cassandra DEV <dev@cassandra.apache.org>
Subject: Re: [DISCUSS] CASSANDRA-16922 CEP-10: Major Prerequisites (Phase 1)
> As these progress through review, the aim is to roll them up into a single 
> branch and merge that to trunk together, keeping the separate commits for the 
> specific JIRAs.

I think this is a great idea.  Where do you see the “Roll Up Branch” living?  
Does the project want to start keeping long lived feature branches in the 
apache/cassandra repository?  Or should the roll up branch still be kept in a 
fork?

Caleb expressed interest in following this development model for SAI as well, 
and I think it makes sense for all of the larger CEPs to develop them in longer 
lived feature branches to be merged into trunk once they are complete.

-Jeremiah

> On Sep 17, 2021, at 1:52 PM, Sam Tunnicliffe <s...@beobal.com> wrote:
>
> This umbrella issue covers the major structural refactorings to enable the 
> higher level pieces of CEP-10. The current proposal is to post separate 
> patches for each JIRA to lessen the review burden as much as possible. 
> However, the patches are incremental, so there is a dependency from one to 
> the next. As these progress through review, the aim is to roll them up into a 
> single branch and merge that to trunk together, keeping the separate commits 
> for the specific JIRAs.
>
> These patches are not intended to introduce any significant new behaviour, 
> they're largely just introducing new abstractions to enable pieces of the 
> system to be swapped out when running simulations.These patches are 
> foundational to the CEP-10 work and so getting them landed is something of a 
> priority. They have been produced collaboratively by several committers, but 
> obviously further review and feedback is strongly encouraged. That said, 
> allocating requisite time and resources to such large and complex changesets 
> can be challenging, so we have a balance to strike.
>
> Whilst the 2 committer review requirement can technically be satisfied 
> already, it's reasonable to give fair warning and opportunity to contribute 
> before we start moving this forward. Notwithstanding that, there are some 
> failing tests still to address, mostly due to changes made in trunk since 
> this work was started and subsequently encountered during rebase.
>
> Thanks,
> Sam
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