1. Terry: Chrome has 500MB file pushed up. Using Gerrit, feature work
becomes stale over a few days, then push. For a few months pushes would
push gigabytes of data.
2. Stolee: where we do the tree walk, we are doing it from the merge
base.
Jonathan N: Minh rescued us by advertising more .have refs to avoid it
being pushed. In protocol V2 for push there are 3 major changes
proposed: one, abbreviating ref advertisement; two, adding negotiation;
three, push to fast moving ref if you don’t care if its a fast
forward. Are there other cases?
3. Minh: performance on reachability. Would help to know what branch you
are pushing.
4. Peff: I might be pushing a random sha, without a branch.
5. Brian: I’ve seen cases with 80k refs, we tried then to send minimal
amounts of objects. We spend a lot of time negotiating, to eventually
only send 4 objects. It’s not very efficient, you could just spend
less time on that and send a few more objects.
6. Minh: can we invert the pattern? Just send the new thing, and then
the server says give me more.
7. Peff: You’ll get N+1 issues.
8. Jonathan N: I like Jeff Hostetler’s idea in Zoom chat. You can look
at the branch and see when the author changes and use that as a crude
heuristic to ask the server if they have that commit.