[Building Sakai] Displaying Users Present (or not)

[Matthew Buckett]

On 7 May 2010 13:55, Stephen Marquard <stephen.marquard at uct.ac.za> wrote:
> The 2.7 presence service also has support for expiring presence more aggressively if not renewed to
> handle cases such as where users close the browser (currently the presence for such a user would
> only go away when his/her session ended).

http://jira.sakaiproject.org/browse/SAK-5538

> However this conflicts to some extent with the portal-generated presence events because the
> presence would 'ping pong' (get expired and set again on page navigation). The portal-generated
> presence should really have a longer timeout (e.g. valid for 15 minutes or something) if presence is
> not being disabled.

I am looking at enable presence to be switched on/off on a per-site basis.

> As some of the reason why sites disabled presence is to reduce server load (especially for large
> sites where you might expected 400+ concurrent users in a site for assessment scenarios), I'm not
> sure if leaving the courier calls but not displaying the user list would really be a popular option.

What was the bottleneck when a large number of presence calls are
being made in one site?

-- 
  Matthew Buckett
  VLE Developer, LTG, Oxford University Computing Services