[Qgis-developer] Processing algorithms and API breaks

Victor Olaya volayaf at gmail.com
Mon Mar 7 00:39:37 PST 2016

I would say that the "agrresive" approach (introducing API breaks
without waiting for next version) is a better option. Changes are
small and will be easy to adapt to (in most cases, it will happen that
an algorithm that changes is not used in any model, or just by a
handful of users). So the improvement-vs-annoyment ratio is high...

My 2 cents

2016-03-07 9:13 GMT+01:00 Alexander Bruy <alexander.bruy at gmail.com>:
> Hi all,
> Processing, became an important part of QGIS. More and more users use it
> and rely on it, especially when they developed their own models and scripts.
> So we should keep Processing algorithms as stable as possible and don't
> change their descriptions.
> On other hand there are many bugreports and feature requests which require
> changing algorithms description to be fixed/impelemented. This can be considired
> as "API" break, as scripts and models which use affected algorithms
> and were developed before such changes will not work. For example,
> there were many
> PR about fixing GRASS and SAGA algs, which change their descriptions. Time
> from time we also fix bugs in native QGIS algs and also need to change
> algorithm description, e.g. by replacing one parameter type with another or
> adding new parameter.
> I see only two solutions:
> 1. Postpone such changes for next major QGIS release when API break is
> allowed. In this case all existing scripts/models will work. But we
> should live
> with bugs and without some features, even if fix already available and keep the
> code of this fixes in sync with master until next major release.
> 2. Allow "API" breaks in Processing. In this case we create additional pressure
> on the authors of 3rd party models/scripts and force them to follow Processing
> changes and update their code accordingly.
> What do you think, which approach we should choose?
> --
> Alexander Bruy
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