From: Jeff King <peff@peff.net>
To: Jonathan Nieder <jrnieder@gmail.com>
Cc: Jonathan Tan <jonathantanmy@google.com>, git@vger.kernel.org
Subject: Re: [PATCH] gc: do not warn about too many loose objects
Date: Mon, 16 Jul 2018 18:43:37 -0400 [thread overview]
Message-ID: <20180716224337.GB12482@sigill.intra.peff.net> (raw)
In-Reply-To: <20180716220306.GI11513@aiede.svl.corp.google.com>
On Mon, Jul 16, 2018 at 03:03:06PM -0700, Jonathan Nieder wrote:
> Jeff King wrote:
>
> > I don't think any command should report failure of its _own_ operation
> > if "gc --auto" failed. And grepping around the source code shows that we
> > typically ignore it.
>
> Oh, good point. In non-daemon mode, we don't let "gc --auto" failure
> cause the invoking command to fail, but in daemon mode we do. That
> should be a straightforward fix; patch coming in a moment.
OK, that definitely sounds like a bug. I'm still confused how that could
happen, though, since from the caller's perspective they ignore git-gc's
exit code either way. I guess I'll see in your patch. :)
> > What I was trying to say earlier is that we _did_ build this
> > rate-limiting, and I think it is a bug that the non-daemon case does not
> > rate-limit (but nobody noticed, because the default is daemonizing).
> >
> > So the fix is not "rip out the rate-limiting in daemon mode", but rather
> > "extend it to the non-daemon case".
>
> Can you point me to some discussion about building that rate-limiting?
> The commit message for v2.12.2~17^2 (gc: ignore old gc.log files,
> 2017-02-10) definitely doesn't describe that as its intent.
I think that commit is a loosening of the rate-limiting (because we'd
refuse to progress for something that was actually time-based). But the
original stopping comes from this discussion, I think:
https://public-inbox.org/git/xmqqlhijznpm.fsf@gitster.dls.corp.google.com/
(I didn't read the whole thread, but that was what I hit by blaming the
log code and then tracing that back to the list).
> This is the kind of review that Dscho often complains about, where
> someone tries to fix something small but significant to users and gets
> told to build something larger that was not their itch instead.
I don't know how to say more emphatically that I am not asking anyone to
build something larger (like cruft packfiles). I'm just trying to bring
up an impact that the author didn't consider (and that IMHO would be a
regression). Isn't that what reviews are for?
I only mention packfiles because as the discussion turns to "well, all
of these solutions are mediocre hacks" (because they absolutely are),
it's important to realize that there _is_ a right solution, and we even
already know about it. Even if we don't work on it now, knowing that
it's there makes it easier to decide about the various hacks.
> The comments about the "Why is 'git commit' so slow?" experience and
> how having the warning helps with that are well taken. I think we
> should be able to find a way to keep the warning in a v2 of this
> patch. But the rest about rate-limiting and putting unreachable
> objects in packs etc as a blocker for this are demoralizing, since
> they gives the feeling that even if I handle the cases that are
> handled today well, it will never be enough for the project unless I
> solve the larger problems that were already there.
I really don't know why we are having such trouble communicating. I've
tried to make it clear several times that the pack thing is not
something I expect your or Jonathan Tan to work on, but obviously I
failed. I'd be _delighted_ if you wanted to work on it, but AFAICT this
patch is purely motivated by:
1. there's a funny exit code thing going on (0 on the first run, -1 on
the second)
2. the warning is not actionable by users
I disagree with the second, and I think we've discussed easy solutions
for the first.
-Peff
next prev parent reply other threads:[~2018-07-16 22:43 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-16 17:27 [PATCH] gc: do not warn about too many loose objects Jonathan Tan
2018-07-16 17:51 ` Jeff King
2018-07-16 18:22 ` Jonathan Nieder
2018-07-16 18:52 ` Jeff King
2018-07-16 19:09 ` Jonathan Nieder
2018-07-16 19:41 ` Jeff King
2018-07-16 19:54 ` Jonathan Nieder
2018-07-16 20:29 ` Jeff King
2018-07-16 20:37 ` Jonathan Nieder
2018-07-16 21:09 ` Jeff King
2018-07-16 21:40 ` Jonathan Nieder
2018-07-16 21:45 ` Jeff King
2018-07-16 22:03 ` Jonathan Nieder
2018-07-16 22:43 ` Jeff King [this message]
2018-07-16 22:56 ` Jonathan Nieder
2018-07-16 23:26 ` Jeff King
2018-07-17 1:53 ` Jonathan Nieder
2018-07-17 8:59 ` Ævar Arnfjörð Bjarmason
2018-07-17 14:03 ` Jonathan Nieder
2018-07-17 15:24 ` Ævar Arnfjörð Bjarmason
2018-07-17 20:27 ` Jeff King
2018-07-18 13:11 ` Ævar Arnfjörð Bjarmason
2018-07-18 17:29 ` Jeff King
2018-07-17 15:59 ` Duy Nguyen
2018-07-17 18:09 ` Junio C Hamano
2018-07-16 19:15 ` Elijah Newren
2018-07-16 19:19 ` Jonathan Nieder
2018-07-16 20:21 ` Elijah Newren
2018-07-16 20:35 ` Jeff King
2018-07-16 20:56 ` Jonathan Nieder
2018-07-16 21:12 ` Jeff King
2018-07-16 19:52 ` Jeff King
2018-07-16 20:16 ` Elijah Newren
2018-07-16 20:38 ` Jeff King
2018-07-16 21:09 ` Elijah Newren
2018-07-16 21:21 ` Jeff King
2018-07-16 22:07 ` Elijah Newren
2018-07-16 22:55 ` Jeff King
2018-07-16 23:06 ` Elijah Newren
2018-07-16 21:31 ` Jonathan Nieder
2018-07-17 6:51 ` [PATCH v2 0/3] gc --auto: do not return error for prior errors in daemonized mode Jonathan Nieder
2018-07-17 6:53 ` [PATCH 1/3] gc: improve handling of errors reading gc.log Jonathan Nieder
2018-07-17 18:19 ` Junio C Hamano
2018-07-17 19:58 ` Jeff King
2018-07-17 6:54 ` [PATCH 2/3] gc: exit with status 128 on failure Jonathan Nieder
2018-07-17 18:22 ` Junio C Hamano
2018-07-17 19:59 ` Jeff King
2018-09-17 18:33 ` Jeff King
2018-09-17 18:40 ` Jonathan Nieder
2018-09-18 17:30 ` Jeff King
2018-07-17 6:57 ` [PATCH 3/3] gc: do not return error for prior errors in daemonized mode Jonathan Nieder
2018-07-17 20:13 ` Jeff King
2018-07-18 16:21 ` Junio C Hamano
2018-07-18 17:22 ` Jeff King
2018-07-18 18:19 ` Junio C Hamano
2018-07-18 19:06 ` Jeff King
2018-07-18 19:55 ` Junio C Hamano
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