> On 16 Oct 2020, at 17:48, Pierre Rogier <[email protected]> wrote:
> 
> Hi William,
> I agree with your architecture points and that is why I said my proposal is a 
> less appealing trade off. 
> 
> My real concern is your last point:
>  we just do not know and IMHO we are unable to predict what (or if) config 
> will cause problems, and I am afraid we will only discover it when people 
> start to complain.
> So I still think that the benefit/risk ratio is bad) 
> 

I think this wasn't my point. The thing is *any* change will have that 
"unknown" risk. Our job is to qualify and identify as many of those risks as we 
can, to remove them as unknowns. Think about the work recently to merge the 
changelog to the main db, or BDB to LMDB work, even changing from perl to 
python for installation. These are all significantly larger changes, which 
would be "much riskier" but all of them have been managed effectively by the 
team communicating, coordinating, analysing, designing and testing changes.

So I really don't accept this "unknown" risk argument. I have laid out a design 
that explores the configuration, how it works today and how the values are 
currently trusted, and a process to manage and understand this change in a way 
to minimise the risk. There are associated tests, and it passes with address 
sanitiser, and other test cases for mapping trees, replication and others.

If we just say "unknown risk" at every change we make we'd never progress. We 
may as well packup and go home, the project is completed.

So I still stand by my design and the PR I have submitted in this case, and if 
there are concerns about esoteric configurations, then we should identify and 
understand them too beyond the testing I have already provided.

—
Sincerely,

William Brown

Senior Software Engineer, 389 Directory Server
SUSE Labs, Australia
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