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Spring schedulers in a load balanced environment

I have multiple quartz cron jobs in a load balanced environment. Currently, these jobs run on every node, which is not desirable. I want a node to only start a specific scheduler, and if a node crashes, the other node has to start a scheduler that targets the crashed node. How can this be done with spring 2.5.6 / tomcat load balancer.

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I think there are several aspects to this question.

First, Quartz has API methods to pause and resume the Scheduler, or even individual triggers and jobs

eg. http://www.jarvana.com/jarvana/view/opensymphony/quartz/1.6.1/quartz-1.6.1-javadoc.jar!/org/quartz/Scheduler.html#standby ()

I would create a spring bean with a link to the scheduler or trigger Quartz and a simple boolean isMasterNode to persist the state. Then I expose two calls to the restricted web service, makeMaster and makeSlave, which will call Scheduler.resume () or standby / pause, respectively.



Finall, the big question is how and with what you determine that another node has crashed.

If you are using a hardware loadbalancer to control this, you can configure it to call WSM 'makeMaster' on the new 'primary' node, which in turn calls Scheduler.resume () or similar.

HTH

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