Re: Call for Consensus: Moving HTTP/3, QPACK and Recovery to the Late-Stage Process

Ian Swett <ianswett@google.com> Wed, 13 November 2019 14:39 UTC

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From: Ian Swett <ianswett@google.com>
Date: Wed, 13 Nov 2019 09:39:26 -0500
Message-ID: <CAKcm_gPJw3rNgTRCATN9==Nno4Q--X433r4LCjiGytr_VJ3pGg@mail.gmail.com>
Subject: Re: Call for Consensus: Moving HTTP/3, QPACK and Recovery to the Late-Stage Process
To: Martin Duke <martin.h.duke@gmail.com>
Cc: Mike Bishop <mbishop@evequefou.be>, Lars Eggert <lars@eggert.org>, Mark Nottingham <mnot@mnot.net>, IETF QUIC WG <quic@ietf.org>, Roy Fielding <fielding@gbiv.com>
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I'm not aware of anything important in-flight( :) ) for recovery.  #3066
<https://github.com/quicwg/base-drafts/pull/3066> has been in the editor's
copy for over a week now, and did not quite make -24, so I would recommend
reading the editors copy.  There is one handshake optimization PR(#3080
<https://github.com/quicwg/base-drafts/pull/3080>) and an alternate
solution to the amplification deadlock(#3162
<https://github.com/quicwg/base-drafts/pull/3162>), but neither is critical
in my opinion.

There is a possibility of the discard keys conversation changing recovery,
though at least one solution(HANDSHAKE_DONE
<https://github.com/quicwg/base-drafts/pull/3145>) does not require any
changes.  If changes are required, I expect them to be ~2-3 sentences.

On Tue, Nov 12, 2019 at 7:43 PM Martin Duke <martin.h.duke@gmail.com>; wrote:

> Put another way, I think Gorry's planned review of draft-24 is probably
> premature.
>
> On Tue, Nov 12, 2019 at 4:42 PM Martin Duke <martin.h.duke@gmail.com>;
> wrote:
>
>> IMO the recovery draft is in the midst of a major revision dealing with
>> the aftereffects of discarding the crypto timeout. Ian still has a bunch of
>> stuff in flight for this. When all of those PRs land I would like to have a
>> short period to review the working draft and see if it looks good.
>>
>> On Mon, Nov 11, 2019 at 7:40 AM Mike Bishop <mbishop@evequefou.be>; wrote:
>>
>>> I'll also note that it's relatively easy from a spec perspective to
>>> allow trailers to arrive before the end of the body, or to allow multiple
>>> sets of trailers to arrive.  I suspect most clients won't process trailers
>>> until they have the body anyway, but the real question is what clients do
>>> with multiple trailer sets.  I'm not certain whether that's in our scope or
>>> not, but that's a separate conversation.  Feel free to open an issue for
>>> that specific discussion.
>>>
>>> -----Original Message-----
>>> From: QUIC <quic-bounces@ietf.org>; On Behalf Of Mark Nottingham
>>> Sent: Sunday, November 10, 2019 8:01 PM
>>> To: Roy Fielding <fielding@gbiv.com>;
>>> Cc: Lars Eggert <lars@eggert.org>;; IETF QUIC WG <quic@ietf.org>;
>>> Subject: Re: Call for Consensus: Moving HTTP/3, QPACK and Recovery to
>>> the Late-Stage Process
>>>
>>> Hi Roy,
>>>
>>> Responding to the parts relevant to this CfC.
>>>
>>> > On 7 Nov 2019, at 5:39 am, Roy T. Fielding <fielding@gbiv.com>; wrote:
>>> >
>>> >> On Nov 5, 2019, at 5:01 PM, Mark Nottingham <mnot@mnot.net>; wrote:
>>> >>
>>> >> Previously, we've moved to the 'late-stage process' documented at [1]
>>> for the Transport and TLS drafts. The chairs and editors now feel that it's
>>> time to move the Recovery, HTTP/3, and QPACK drafts to that process as well.
>>> >>
>>> >> As before, this is because we're getting to a stage we feel the
>>> documents would benefit from slower and slightly more formal process, so
>>> that the rate of change is not so high, changes that do occur are
>>> well-vetted, and the documents get closer to reflecting consensus in the
>>> working group.
>>> >
>>> > I don't think that process has worked well for QUIC.
>>>
>>> Noted.
>>>
>>> > There are specific issues that are contentious enough to timebox and
>>> > conclude, in a formal (and faster) fashion than was done before.
>>> > That makes sense when needed for a specific issue. I don't know of any
>>> > such issues for those three drafts. IOW, I don't know of any issues
>>> > for which it makes sense for the Chairs to pre-empt the specification
>>> > authors in deciding what can or cannot result in changes to the drafts
>>> > just because of the timing of when the issue was raised.
>>>
>>> You misunderstand the process; the Chairs aren't pre-empting anything,
>>> the group is attempting to agree to a path to completing this work.
>>>
>>> > The late-stage process seems to focus all of our energy into
>>> > in/out-of-scope arguments rather than actual text in the
>>> specifications.
>>>
>>> I don't see any evidence for that claim; what makes you believe that?
>>>
>>> > The last interim spent easily twice as much time discussing process
>>> > and process planning than it did HTTP/3. Prior interims were worse.
>>>
>>> We spent a day talking about transport and TLS, part of a morning
>>> talking about planning the future of our work (if you want to call that
>>> "process and process planning") and the bulk of the (longer) afternoon
>>> session talking about H3. This isn't surprising, since our goal for the
>>> meeting was to get the Transport and TLS documents close to finished.
>>>
>>> > I don't even recall the last time contents of the HTTP/3 spec being
>>> > discussed on list, outside of very specific issues related to
>>> transport.
>>> > I would like to see HTTP/3 written with HTTP in mind, not as a set of
>>> > diffs against h2.
>>>
>>> That is by charter; we're largely limited to mapping H2 onto QUIC.
>>>
>>> > This is not a small undertaking, but it isn't a massive one either..
>>> > Basically, import the bits of h2 that are necessary to explain
>>> > HTTP/3's operation and intent, and then start referencing the
>>> > http-core drafts instead of 723x. Yes, I know that is risky, but it is
>>> the right thing to do.
>>> > And it needs to be done before http-core is finished, since that
>>> > effort exists largely to place the right content (in the right places)
>>> > for
>>> > HTTP/3 to reference.
>>>
>>> AIUI that is still our intent, and shouldn't be impeded by the
>>> late-stage process, since that work should be editorial.
>>>
>>> > I have no idea what the status is with QPACK, but we should learn a
>>> > lesson from the last time and make sure the fixed compression
>>> > dictionary (if any) is based on traffic at more than one proxy or
>>> > origin server. Or at least have each of the major deployments generate
>>> > their local "best" encoding and do some cross-testing of the N choices
>>> > (plus one or two based on a hand-crafted expert merge).
>>> >
>>> > I would like for HTTP/3 to have a mechanism for communicating metadata
>>> > (like trailers) in mid-stream, both for requests (e.g., priority) and
>>> > responses (e.g., chained sigs). That has been a design goal for HTTP
>>> > since 1995 or so. HTTP/1.1 had it, albeit limited to chunked
>>> extensions.
>>> > It has been proposed multiple times and keeps getting postponed
>>> > because of "concern about scope". This is not a semantics issue (they
>>> > are just optional trailers that arrive early) -- it is a multiplex
>>> > framing issue (a new frame type and expectation to process).
>>>
>>> Where are the multiple proposals you refer to? We've been working on h3
>>> now for more than three years. If you submit them now, they'll be design
>>> issues.
>>>
>>> I'd say that the Late-Stage process (or at least the proposal of
>>> adopting it) is working exactly as intended here -- making people realise
>>> that if they still have issues / changes that they want discussed, they
>>> need to bring them to our attention now, not as we go to WGLC.
>>>
>>> Cheers,
>>>
>>> --
>>> Mark Nottingham   https://www.mnot.net/
>>>
>>>