Re: [Extra] Benjamin Kaduk's Discuss on draft-ietf-extra-imap-fetch-preview-03: (with DISCUSS and COMMENT)

Michael Slusarz <michael.slusarz@open-xchange.com> Thu, 25 April 2019 03:52 UTC

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Date: Wed, 24 Apr 2019 21:52:19 -0600 (MDT)
From: Michael Slusarz <michael.slusarz@open-xchange.com>
To: Alexey Melnikov <aamelnikov@fastmail.fm>, Michael Slusarz <michael.slusarz=40open-xchange.com@dmarc.ietf.org>, Benjamin Kaduk <kaduk@mit.edu>, Adam Roach via Datatracker <noreply@ietf.org>, The IESG <iesg@ietf.org>
Cc: extra@ietf.org, Bron Gondwana <brong@fastmailteam.com>, extra-chairs@ietf.org, draft-ietf-extra-imap-fetch-preview@ietf.org
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Subject: Re: [Extra] Benjamin Kaduk's Discuss on draft-ietf-extra-imap-fetch-preview-03: (with DISCUSS and COMMENT)
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> On April 11, 2019 at 4:29 AM Alexey Melnikov <aamelnikov@fastmail.fm> wrote:
> 
> Hi Michael,
> 
> On Thu, Apr 11, 2019, at 3:32 AM, Michael Slusarz wrote:
> 
> > More broadly, any IMAP command should be subject to this kind of 
> > truncation if there is concern that completion risks resource 
> > starvation as a consequence.  (On that note, I thought there was some 
> > sort of "resource limitation" response code defined for this kind of 
> > situation, e.g. in RFC 5530, but it looks like there isn't.  Maybe we 
> > need something like this).
> 
> I think we have TEMPFAIL for this: <https://www.iana.org/assignments/imap-response-codes/imap-response-codes.xhtml#imap-response-codes-1>

As a bare response code, this seems like the correct answer.  But in RFC 5259, TEMPFAIL is defined as a "transcoding request [that] failed temporarily".  My opinion: I don't think that maps to failing a[ny] IMAP request due to resource constraints.

michael