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From: Stefan Beller <sbeller@google.com>
To: Eric Wong <e@80x24.org>, git <git@vger.kernel.org>,
	meta@public-inbox.org
Subject: Re: "IMAP IDLE"-like long-polling "git fetch"
Date: Wed, 9 Jan 2019 14:27:25 -0800
Message-ID: <CAGZ79kb9Tbnxe1mSnxpqT_FO6Gdi6wxd-r2YarHXRF1sVRyxLA@mail.gmail.com> (raw)
In-Reply-To: <20181229043858.GA28509@pure.paranoia.local>

On Fri, Dec 28, 2018 at 8:39 PM Konstantin Ryabitsev
<konstantin@linuxfoundation.org> wrote:
>
> On Sat, Dec 29, 2018 at 03:56:21AM +0000, Eric Wong wrote:
> > Hey all, I just added this to the TODO file for public-inbox[1] but
> > obviously it's intended for git.git (meta@public-inbox cc-ed):
> >
> > > +* Contribute something like IMAP IDLE for "git fetch".
> > > +  Inboxes (and any git repos) can be kept up-to-date without
> > > +  relying on polling.
> >
> > I would've thought somebody had done this by now, but I guess
> > it's dependent on a bunch of things (TLS layer nowadays, maybe
> > HTTP/2), so git-daemon support alone wouldn't cut it...
>
> Polling is not all bad, especially for large repository collections.

I disagree with that statement.

IIRC, More than half the bandwidth of Googles git servers are used
for ls-remote calls (i.e. polling a lot of repos, most of them did *not*
change, by build bots which are really eager to try again after a minute).

That is why we use a superproject, with all other repositories as
a submodule for polling, as that would slash the ls-remote traffic
approximately by the number of repositories.

There was an attempt in JGit to support this type of communication
of long polling at
https://git.eclipse.org/r/plugins/gitiles/jgit/jgit/+/2adc572628f9382ace5fbd791325dc64f7c968d3
but not a whole lot is left over in JGit as it was refactored at least
once again.

IIRC the issues where in the lack of protocol definition that made it
usable for a wider audience.

  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20181229034342.11543-1-e@80x24.org>
2018-12-29  3:56 ` Eric Wong
2018-12-29  4:38   ` Konstantin Ryabitsev
2018-12-29  6:13     ` Eric Wong
2019-01-09 22:27     ` Stefan Beller [this message]
2019-01-09 22:49       ` Konstantin Ryabitsev
2019-05-02  8:50       ` Eric Wong
2019-05-02  9:21         ` Ævar Arnfjörð Bjarmason
2019-05-02  9:42           ` Eric Wong

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