[llvm-dev] [cfe-dev] RFC: Switching from Bugzilla to Github Issues [UPDATED]

Michael Kruse via llvm-dev llvm-dev at lists.llvm.org
Fri Apr 24 18:42:43 PDT 2020

Am Fr., 24. Apr. 2020 um 16:13 Uhr schrieb Sam McCall via cfe-dev
<cfe-dev at lists.llvm.org>:
> On Fri, Apr 24, 2020 at 9:03 PM Tom Stellard <tstellar at redhat.com> wrote:
>> On 04/24/2020 03:24 AM, Sam McCall wrote:
>> > clangd's experience using github issues to track bugs (in a separate repo) has been very positive, and I'm glad you're pushing on this!
>> >
>> > Part of this has been that our issue tracker has been scoped to our subproject only, which is a scope that the tool works well for (on the user and developer side).
>> > As such I don't think we should migrate clangd to a using the monorepo bugtracker. Email subscription to a label is better than nothing, but worse than a separate repo.
>> > Removing the clangd label from the monorepo bugtracker seems like the simplest thing, though I'm happy to work on auto-moving bugs if that's better.
>> >
>> > (I'd suggest considering the same for other subprojects, though I know that's not a popular opinion here)
>> I think it's important for everything in the monorepo to use the same bug tracker.
>> There are advantages to having code in the monorepo (e.g. free
>> updates for API changes, a more consistent build experience, etc.).
>> But there are also costs, as you have pointed out, like having to use
>> a less than ideal bug tracker.  It's really up to sub-projects
>> to make the decision about whether these benefits are worth the costs.
>> The flang developers have just gone through this process and have
>> had to make some sacrifices to get the code in, but ultimately felt the
>> sacrifices were worth it.
>> I think it hurts the ability of developers and users to collaborate effectively,
>> if the infrastructure for the project is spread across too many different places.
>> And good collaboration is key for a project of this size with some many tightly
>> connected components.
> (sorry, I should probably not tilt at this windmill. More on-topic stuff below, I promise!)
> Right, and I think having a single-project view of the LLVM organization is a mistake: it's a graph of projects, some are highly connected and some are not.
> The monorepo has a strong technical reason: the graph is connected and accepting a CI boundary anywhere is expensive in the absence of stable APIs.
> But this is much less true for bug tracking systems: the cost to crossing boundaries is smaller.
> For clangd, the benefit of sharing a tracker with clang AST+Sema is less than the cost of sharing a tracker with clang codegen, LLVM proper, LLD, flang, MLIR, ... (and the opposite is true for source control/CI).
> Anyway, this is going to depend on what part(s) of the project graph you touch: people connected to many parts will want to make coordinating with hundreds of people incrementally, while people connected to few parts are far better served by communicating only with the people they need to (communication famously scales badly).

I think there is another aspect important to mention. Users not
familiar with the LLVM developers tooling will see an official GitHub
project that allows submitting bugs. It is non-obvious that there is
another GitHub project just for bug tracking, especially if there are
multiple of those for different subprojects and even worse if the main
repository itself has an active issue tracker. As with the current
GitHub projects, we already had ~200 issues filed even though we did
not even intent to use GitHub for this.


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