AEM as Cloud Service - Scheduler Trigger Twice

Question

I have created a scheduler which looks for the content fragment and updates its properties once a day. The job works okey on local cloud sdk. But on cloud environment; scheduler is getting activated twice and as it tries to update same content fragment it throws "javax.jcr.InvalidItemStateException: OakState0001: Unresolved conflicts" error.

The code looks like this

@Component(immediate = true, service = Runnable.class,property = {
        "scheduler.expression=0 0 2 ? * *"
})
public class TestScheduledTask  implements Runnable {

How can i make job trigger only once on cloud environment?

joerghoh · Accepted Answer

try "LEADER" (all caps).

See https://github.com/apache/sling-org-apache-sling-commons-scheduler/blob/08cbef57b9623e842486624b1e29bcb1754eae54/src/main/java/org/apache/sling/commons/scheduler/impl/QuartzScheduler.java#L267

joerghoh · Answer

In AEM as a Cloud Service you have a cluster of authors, typically 2 or more instances. So you need to restrict this job to run only on one node.

The easiest way to achieve this is specifying it as an additional property:

@Component(immediate = true, service = Runnable.class,property = {
        "scheduler.expression=0 0 2 ? * *",
        "scheduler.runOn=Leader"
})
public class TestScheduledTask  implements Runnable {

See:

https://sling.apache.org/documentation/bundles/scheduler-service-commons-scheduler.html#scheduling-the-job-just-once-in-a-cluster-1

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