Re: [PATCH] Revert "fetch: default to protocol version 2"

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On Wed, Apr 22, 2020 at 08:50:47AM -0700, Jonathan Nieder wrote:

> This reverts commit 684ceae32dae726c6a5c693b257b156926aba8b7.
> 
> Users fetching from linux-next and other kernel remotes are reporting
> that the limited ref advertisement causes negotiation to reach
> MAX_IN_VAIN, resulting in too-large fetches.

OK, now that we have data I think this strategy is reasonable.

That said, it will take a while to make it to a release, so we very well
may have brought v2 and v0 to parity in the meantime.

> > To get you unstuck, the immediate workaround is to drop back to the
> > older protocol, like:
> >
> >   git -c protocol.version=0 fetch --all
> 
> By the way, I'd recommend the immediate workaround of
> 
> 	git fetch --negotiation-tip=refs/remotes/xo/* xo
> 
> instead.  But that's a separate subject.

It seems like if we are fetching with refspec X/*:Y/* that we should
perhaps automatically select our local Y/* negotiation tips.

That said, neither it (nor the manual version above) would help the case
I've been testing with. It's a first fetch from "xo", which can reuse
history we already have from other remotes.

I agree it's a good workaround for folks doing their daily fetches,
though.

-Peff



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