Open Stack

Hi,

I recently noticed the influx of big patches hitting Gerrit (especially in
fuel-web, but I also heard that there was a couple of big ones in library).
I think that patches that have 1000 LOC are simply too big to review
thoroughly and reliably.

I would argue that there should be a limit to patch size, either a soft one
(i.e. written down in contributor guidelines) or a hard one (e.g. enforced
by gate job).

I think that we need a discussion whether we really need this limit, what
should it be, and how to enforce it.

I personally think that most patches that are over 400 LOC could be easily
split into at least two smaller changes.

Regarding the limit enforcement - I think we should go with the soft limit,
with X LOC written as a guideline and giving the reviewers a possibility to
give -1s to patches that are too big, but also giving the possibility to
merge bigger changes if it's absolutely necessary (in really rare cases the
changes simply cannot be split). We may mix in the hard limit for
ridiculously large patches (twice the "soft limit" would be good in my
opinion), so the gate would automatically reject such patches, forcing
contributor to split his patch.

Please share your thoughts on this.

Regards,
Maciej Kwiek
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