Clustering cron jobs with Hazelcast

[Roger]

I'd like to have way to make cron jobs (or Quartz jobs) fault-tolerant
using Hazelcast. What I want is that the job can be scheduled
identically on all servers in the cluster, but only one will actually
try to run it. Anyone got any ideas about how to achieve this?

regards,
Roger Armstrong
Armstrong Consulting GmbH

[Talip Ozturk]

Create a local scheduled executor on each node. Register your cron job
with the local scheduled executor service and wrap your cron job
execution with one of the following two logics.

1. If you don't care to balance the execution then let the first
member in the cluster always execute the cron job.

Set<Member> members = Hazelcast.getCluster.getMembers();
if (members.next().localMember()) { // only first member will execute
the scheduled cron job.
cronjob.run();
}

2. If you want to balance the execution then let the first member fire
the execution of the cron job in the cluster.

Set<Member> members = Hazelcast.getCluster.getMembers();
if (members.next().localMember()) {
Hazelcast.getExecutorService().execute(cronjob); // execute
the cron job somewhere in the cluster.
}

AtomicNumber counter = Hazelcast.getAtomicNumber(cronJobName);
long current = counter.get();
if (counter.compareAndSet(current, current+1)) {
cronjob.run();
}

Object cronJobId = cronjob.getId();
Set set
Lock lock = Hazelcast.getLock(cronJobId);
lock.lock();
if (
cronjob.run();
lock.unlock();

twitter @oztalip

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[Talip Ozturk]

Please ignore the last part of my email below, starting with
AtomicNumber. I was trying other options...

twitter @oztalip