Re: [Json] Regarding JSON text sequence ambiguities (Re: serializing sequences of JSON values)

Nico Williams <nico@cryptonector.com> Fri, 14 March 2014 04:17 UTC

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Date: Thu, 13 Mar 2014 23:17:21 -0500
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From: Nico Williams <nico@cryptonector.com>
To: =?UTF-8?Q?Martin_J=2E_D=C3=BCrst?= <duerst@it.aoyama.ac.jp>
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Subject: Re: [Json] Regarding JSON text sequence ambiguities (Re: serializing sequences of JSON values)
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On Thu, Mar 13, 2014 at 10:57 PM, "Martin J. Dürst"
<duerst@it.aoyama.ac.jp> wrote:
> The JSON text sequence idea comes from a minor inconvenience of JSON arrays.

Hmm?  For me it comes from jq, and there it's just... natural, nothing
to do with inconveniences of JSON arrays, and everything to do with
the need to have indeterminate-length streams of values.

Exploring that further there's the fact that non-online JSON parsers
can be used to construct JSON text sequence parsers that handle each
text in a non-online manner, but the sequence in an online manner --
this makes a world of a difference when processing large amounts of
data encoded in JSON:

 - One big array + not-online parser -> can't process more than fits
in memory parsed, and can't start until it's all parsed.

 - JSON text sequence + not-online parser -> no limit based on number
of texts, just size of each text.

Needless to say, online parsers can handle huge texts just fine, but
they are very difficult to use.  JSON text sequences are just the
sweet spot for easy of use and performance.

> The benefit of JSON is that it is simple and straightforward, but that's
> apparently lost on most people in this discussion ;-(.

Which is why people want to use it more and more, even for large
datasets, and then you run into the need for an online parser.  Or
JSON text sequencing.

Nico
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