[Building Sakai] User pre-caching and clustering

[Sam Ottenhoff]

Also, this was mentioned in another thread re LDAP, but what settings do
you currently have on your UserDirectoryService.callCache?  By default,
user information is cached for 5 minutes.  That is an incredibly low number
especially if your LDAP info rarely changes.

If you LDAP info changes very little, I recommend caching user information
for one day instead of 5 minutes:

memory.org.sakaiproject.user.api.UserDirectoryService=maxElementsInMemory=100000,timeToLiveSeconds=86400,timeToIdleSeconds=0


On Fri, May 9, 2014 at 12:21 AM, Aaron Zeckoski <azeckoski at unicon.net>wrote:

> Joshua,
> The time it takes is dependent on how fast your LDAP is, how good the
> connection is, and various other factors, but since Sakai 2.9 has no
> distributed caching you would have to load that on every server. It
> might be possible to distribute that cache in Sakai 10 by taking
> advantage of some of the work I and others at Unicon did to support
> distributed caching in Sakai. Unfortunately, certain object classes
> (like User) cannot be distributed without extra code work (they have
> to be made completely Serializable) so it would not be trivial but it
> is at least possible.
>
> Aside from switching to a distributed cache, you probably would have
> to find a way to create a faster intermediate source of the data which
> is not the LDAP (but gets the data from the LDAP) and write a provider
> to go against that source instead of LDAP. I don't think that is a
> very good solution though.
> -AZ
>
>
> On Thu, May 8, 2014 at 8:56 PM, Joshua Swink <joshua.swink at gmail.com>
> wrote:
> > I'm looking into the user pre-caching feature, and it appears that the
> daily
> > refresh would need to run on every node in a cluster.
> >
> > https://jira.sakaiproject.org/browse/KNL-826
> >
> > Is that the case? Does anyone have suggestions for running it on one
> node so
> > that the entire cluster has the info? I ask because it looks to be taking
> > about an hour to run.
> >
> > Josh
> >
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>
> --
> Aaron Zeckoski - Software Architect - http://tinyurl.com/azprofile
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