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Re: [netmod] RFC7952 JSON streaming decoding efficiency?

Robert Varga <nite@hq.sk> Thu, 28 February 2019 09:46 UTC

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To: "Rob Wilton (rwilton)" <rwilton@cisco.com>, "netmod@ietf.org" <netmod@ietf.org>
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From: Robert Varga <nite@hq.sk>
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Date: Thu, 28 Feb 2019 10:46:29 +0100
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Subject: Re: [netmod] RFC7952 JSON streaming decoding efficiency?
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On 28/02/2019 10:29, Rob Wilton (rwilton) wrote:
> Hi Robert,

Hey Rob,

> Isn't this just a limitation of JSON, in that the elements in an object are unordered (RFC 8259)?

Yes, but I believe this is object semantics leaking to on-wire format:
while a JSON object is inherently unordered, when emitting object to the
wire, implementations can choose to order the pairs to make
receiver-side processing more efficient.

I wonder if it would be of value to communicate such assumptions out of
band, like separate content-types. In case of RFC7952 the following
hints would be useful:
- the document does not contain metadata (i.e. plain RFC7951)
- "@" occurs as a first element in an object or not at all
- "@foo" occurs immediately after "foo" or not at all

This, of course, would be purely optional optimization...

Regards,
Robert

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