Clustering EJB3 Timers

hpalma Jun 16, 2008 12:38 PM

Hi,

i would like to use EJB Timer services in a clustered JBoss 4.2.1 environment. We are using active / passive cluster configuration so only one cluster node will be active at a given time. My questions are:

- Are the timer services state persisted across the cluster ?
- Does this state in the JBoss implementation include timer restoration ? As in, if my timer is supposed to expire in 10 minutes when the cluster node goes down is it going to expire in 10 minutes when the new cluster node takes over ?

Thanks.

1. Re: Clustering EJB3 Timers

pferraro Jun 17, 2008 12:24 PM (in response to hpalma)

The EJB Timer service is not yet clusterable in JBoss.
This scheduled to be implemented in 5.x.

If a clustered timer is indeed necessary, rather than the standard timer service, you could instead configure JBoss to use a QuartzService:
http://www.opensymphony.com/quartz/api/org/quartz/ee/jmx/jboss/package-summary.html
When configured with a JDBCJobStore, the quartz scheduler is clusterable, as documented here:
http://www.opensymphony.com/quartz/wikidocs/ConfigJDBCJobStoreClustering.html
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