[alto] ALTO for realtime data?

Börje Ohlman <borje.ohlman@ericsson.com> Tue, 04 December 2018 12:53 UTC

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Thread-Topic: ALTO for realtime data?
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Date: Tue, 4 Dec 2018 12:52:53 +0000
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Subject: [alto] ALTO for realtime data?
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I’m interested in finding out if there are thoughts on making it possible to use ALTO for realtime data in the future, or at least possible to use it for data that is being updated quite frequently. Examples of such data could be available bandwidth on links, available storage capacity in caches or CPU load in processing resources.

One possible way to enable such use of ALTO could be to provide a pub/sub option for communication between ALTO clients and servers. Another option is that clients polls the servers at certain intervals. While the pub/sub alternative would be nice it probably would mean substantial changes to the ALTO architecture and protocols. I found an old (2012) draft proposing this draft-madhavan-alto-subscription-01. Does anyone know if this work has continued in some shape or form? If not, does anybody have any history to tell about it? The problem the draft is primarily addressing is to avoid multiple redundant requests for parameter values that have not changed.

I would like to propose a more lightweight mechanism to reduce this problem. We could introduce the possibility for responses from ALTO servers to indicate an expected freshness period for the returned value giving the client a hint to when it makes sense to make the next request.

I by no means consider myself an ALTO expert, so if this functionality already is provided in the existing protocols or it has been already discussed at length, please inform me and accept my apologies for wasting bandwidth on the mailing list.

	Börje Ohlman