From: Junio C Hamano <gitster@pobox.com>
Date: Wed, 03 Jun 2020 20:39:28 GMT
Subject: Re: Huge push upload despite only having a tiny change
Message-ID: <xmqqpnafriin.fsf@gitster.c.googlers.com>
In-Reply-To: <20200603015314.GA253041@google.com>

Jonathan Nieder <jrnieder@gmail.com> writes:

> There is one trick a server can use to mitigate this: advertise some
> refs that don't exist!  If you advertise a ref ".have", then Git
> will understand that the server has that object but it is not an
> actual ref.  Gerrit uses this trick in its HackPushNegotiateHook[1]
> to advertise a few recent commits.
> ...
> Summary: (1) try fetching first (2) let's improve
> HackPushNegotiateHook#advertiseRefs (3) let's improve "git push"
> protocol to make this a problem of the past.

In the meantime, perhaps we can teach receive-pack the same "let's
advertise a few recent commits as if they exist as tips of refs" as
well?