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Re: [quicwg/base-drafts] Use a "stream" for transmitting CIDs (#1826)

Kazuho Oku <notifications@github.com> Tue, 02 October 2018 19:16 UTC

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Subject: Re: [quicwg/base-drafts] Use a "stream" for transmitting CIDs (#1826)
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> I'm wondering if we really need two different framing layers here (one for the CID frame and one for the CID message). Could we just introduce a sequence number for NEW_CID (which would be limited by MAX_NEW_CID), and keep RETIRE_CID as separate frame?

IMO, the costs with that approach are:
* Without using a "stream", you'd need to do book-keeping of each CID being received by the NEW_CID frame, because the frames can arrive out-of-order. "Stream" guarantees in-order-delivery and therefore you only need to maintain a counter.
* Not carrying NEW_CID and RETIRE_CID as a "message" on top of "streams" also means that you would have a retransmission logic specific to those frames.

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