EJB 3 clustered timers (thorntail 2.2.0)

[markus.s]

Hello,

has anyone successfully used the java ee timer function in a clustered setup ?

With the following configuration I had no success.

Tried it on one machine with 2 thorntail instances and one database but timers are triggered on every instance.

Maybe someone has a hint for me:

swarm:
  ejb3:
    timer-service:
      default-data-store: clustered-store
      thread-pool-name: default
      database-data-stores:
        clustered-store:
          database: oracle
          datasource-jndi-name: java:jboss/datasources/my_ds
          partition: timer
          refresh-interval: 60000
  datasources:
    data-sources:
      my_ds:
        user-name: my_ds
        driver-name: oracle
        initial-pool-size: 3
        . . .

-------------------

@Singleton
@Startup
public class ScheduleSample {

    @Resource
    private TimerService timerService;

    @Schedule(hour = "*", minute = "*", second = "*/40", info = "Every second timer", persistent = true)
    public void printDate() {
        System.out.println("### <It is " + LocalDateTime.now() + "> ###");
    }

}

KR

Markus

[john-als]

seems to work for me, how do the content in the database looks? 

TABLE, jboss_ejb_timer ? 

[markus.s]

Yes, it is jboss_ejb_timer table.

On startup of each of both instances a new entry is created by thorntail in that table. Probably that is the root cause... not sure.

96fa7f01-4da1-4bb8-9167-332380a3c371,52403b5d-a508-4ffc-88e9-1b950ddb1476.52403b5d-a508-4ffc-88e9-1b950ddb1476.ScheduleSample,,0,24.09.2018 15:16:00,000000,24.09.2018 15:15:40,018000,,ACTIVE,*/40,*,*,*,*,*,*,,,,1,printDate,ScheduleSample,,1,timer,

130b7849-bf20-4d09-8014-cd848dba7dfa,9f268875-2cf5-4945-88b8-2a447442800b.9f268875-2cf5-4945-88b8-2a447442800b.ScheduleSample,,0,24.09.2018 15:16:00,000000,24.09.2018 15:15:40,018000,,ACTIVE,*/40,*,*,*,*,*,*,,,,1,printDate,ScheduleSample,,1,timer,

[john-als]

yeah the timed_object_id seems generated for each node? how are you running it? this is mine

c124bdc9-de45-47c9-be72-7afb9e6f4313 timer-1.0.0-SNAPSHOT.timer-1.0.0-SNAPSHOT.TimerService (null) 0 2018-09-24 15:36:00 2018-09-24 15:35:50 (null) BD4SRXZlcnkgc2Vjb25kIHRpbWVy ACTIVE */10 * * * * * * (null) (null) (null) true se.cluster.TimerService printDate true timer (null)

[markus.s]

what do you mean by "how are you running it?"

[markus.s]

ok, my fault. running it as a standalone process via IDE is not a good idea.

thorntail generates a UUID war file name

thanks ...

[john-als]

Great! =) 

[markus.s]

Nevertheless, you have to be careful with deployments.

Normally you choose a new version number with a new deployment which can cause trouble on multiple servers.

So for a short while it is possible having multiple timers being active...

[john-als]

Use final name in maven so it's have same file name depending on versions, not perfect but it works. Should be nice to configure the name

[john-als]