On 11/24/2014 06:27 PM, Moti Asayag wrote:
Hi Shubhendu,
----- Original Message -----
From: "Shubhendu Tripathi" <shtri...@redhat.com>
To: devel@ovirt.org
Sent: Monday, November 24, 2014 8:58:34 AM
Subject: [ovirt-devel] Certain questions about Quartz based scheduling in
oVirt
Hi All,
We are in a requirement where we need to schedule jobs at certain time
interval, hourly, daily, weekly and monthly (i.e. repetitive and cron
kind of scheduling).
I was trying to understand quartz based scheduling mechanism in oVirt to
achieve the scenarios.
Have some basic questions regarding the same -
1. Is there is mechanism to persist the scheduling data in oVirt ?
In ovirt we do not persist the jobs. The application reschedule the jobs when
it starts
and programmatically triggers jobs when required.
On packaging/services/ovirt-engine/ovirt-engine.xml.in we specify the job store
configuration
as RAMJobStore, which is a volatile:
<property name="org.quartz.jobStore.class"
value="org.quartz.simpl.RAMJobStore"/>
You may select other implementation. See:
http://quartz-scheduler.org/api/2.2.0/org/quartz/spi/JobStore.html
Would the correct approach then be to have multiple scheduler instances?
1. - that uses the in memory job store
2. that uses DB to persist the jobs.
The second instance would be used to schedule and manage any dynamic
jobs, for instance like the ones required for gluster volume snapshot
scheduling
Using a separate instance also would mean there's no change to existing
jobs that are scheduled in Backend bean.
2. How to tackle edit and rescheduling of jobs ?
You can have a look at org.ovirt.engine.core.utils.timer.SchedulerUtil
interface in
the 'scheduler' project which provides that functionality, and the related
classes.
But if not special requirements, i guess the shipped quartz implementation
should be
enough:
http://quartz-scheduler.org/documentation/quartz-2.x/tutorials/tutorial-lesson-05
Kindly guide on how to achieve these.
Thanks and Regards,
Shubhendu
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