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Re: Input on request for link relation
Jan -- The text you're concerned about is part of the draft protocol at http://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-core-0.2.html#contentdistribution so I think this is a (legitimate) question/critique of the draft spec and should be taken up over at http://groups.google.com/group/pubsubhubbub. (+Brett).
On Thu, Sep 10, 2009 at 4:57 PM, Jan Algermissen <algermissen1971@xxxxxxx>
Section 7.3 says:
On Sep 11, 2009, at 1:31 AM, John Panzer wrote:
Without getting into the appropriate discussion form question, what hub resource semantics (and link relation definition) are you referring to exactly? I can't seem to find it, and it's hard to understand your objection without it.
"If, after a content fetch, the hub determines that the topic feed content has changed, the hub MUST send information about the changes to each of the subscribers to the topic."
I understand this to imply that subscribers expect the hub to definitely send the notifications. What if the hub decides not to due to the number of subscribers it has? Or to turn this around: how would a subscriber ever know whether not receiving notifications means that there are not updates or that the hub stopped sending notifications.
On Thu, Sep 10, 2009 at 12:40 PM, Jan Algermissen <algermissen1971@xxxxxxx> wrote:
not sure the following it is appropriate to discuss this here, so please redirect me to the proper place if so.
Hubs are being discovered by clients by way of the 'hub' link relation. I am
concerned that the semantics of a hub resource (provided by the link relation
definition) are imposing obligations on the server that are contrary what one
would expect to see in the HTTP world.
Or in other words: I think that the assumptions a client makes about the behaviour
of a hub are too rigid. If a hub has more subscribers than it knows it can handle
it might well decide not to notify them. A situation like this is impossible to
prevent by the specification and I think the server should therefore explicitly be
given much more freedom regarding its behavior upon a ping.
Especially given the use of Atom which in a sense implies a very unconstrained
(Sorry if this discussion is already going on elsewhere)
On Sep 10, 2009, at 7:30 PM, Lisa Dusseault wrote:
Comments welcome on the following request
General Request for Assignments (link-relations)
Contact Name :
Type of Assignment :
I want to add a new Atom Link Relation type for the PubSubHubbub protocol
(http://pubsubhubbub.googlecode.com). The relation type is "hub".
The new is used for discovery of Hubs,
which enables real-time notifications of entries in Atom and RSS feeds.
Without making the relation type official, we're not in compliance with the
Additional Info :