[Building Sakai] Preventing ScheduledInvocationRunner from running on a node

[Steve Swinsburg]

Yep sounds reasonable. We need to be flexible for clusters. 
Cheers
Steve

Sent from my iPhone

On 22/03/2013, at 3:23, David Adams <da1 at vt.edu> wrote:

> We ran into similar problems when we tried to add an "admin" server to
> our cluster with a different URL. The practice of background jobs
> self-registering and being completely unmanageable is very problematic.
> Seems like at the very simplest, you could just add a property that
> would allow disabling this job on a per-server basis. Sample patch
> attached.
> 
> I can't see any reason why disabling this on one or a few nodes would
> be a problem so long as it's running somewhere.
> 
> -dave
> 
> Seth Theriault wrote:
>> Hello,
>> 
>> By default, a Sakai server registers a ScheduledInvocationRunner job
>> at startup. This job runs every 10 minutes and queries the
>> SCHEDULER_DELAYED_INVOCATION table for tasks to be executed. Reminders
>> and notifications from Evaluation, Forums, and Content are done this
>> way.
>> 
>> I am wondering if there is any danger in NOT registering this job on a
>> single node in a cluster of Sakai servers. Locally, we have a "feeds"
>> server that is not user-facing but accesses the same database and
>> other data -- including this table -- as the other servers. People are
>> getting reminders from this server -- which has a different URL -- and
>> it's confusing.
>> 
>> Looking at:
>> 
>> jobscheduler/scheduler-component-shared/src/java/org/sakaiproject/component/app/scheduler/ScheduledInvocationManagerImpl.java
>> 
>> there doesn't currently seem to be a method to prevent
>> auto-registration of the job on a particular node, but I think that
>> could be easily done.
>> 
>> Opinions?
>> 
>> Seth
> <disable-sir.patch>
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