topic Re: What happens to processes after server restart (Critical) ? in Alfresco Archive

What happens to processes after server restart (Critical) ?

sazzadul — Fri, 02 Dec 2011 14:04:26 GMT

Hi,I have an issue with activiti which seems to be a showstopper. I have raised this issue earlier in this forum but didn't get any proper answer.Here is the scenrio: I hava a processdef(long running) with several servicetasks and if the server gets restarted during the execution of say servicetask3

Re: What happens to processes after server restart (Critical) ?

sazzadul — Sat, 03 Dec 2011 11:19:15 GMT

Please let me know if this isn't supported and do guide me of a workaround/solution to the problem.

This is very critical for us to fix and we would very much like to go in production as soon as this issue is solved.

I can also add a similiar method like runtimeservice.signal() for service task if you just tell me where in code to look for.

Thanks in advance.

Re: What happens to processes after server restart (Critical) ?

heymjo — Mon, 05 Dec 2011 12:39:53 GMT

This is probably not something that activiti can cater for. If you need your application to be restart-proof you'll have to do this yourself. Adding shutdown hooks is one thing but they are not guaranteed to execute so you're pretty much in the same boat.

How was your application coping with this before you added activiti ?

EDIT and why can't you just do a manual update to the table to reset the status from active?

Re: What happens to processes after server restart (Critical) ?

trademak — Mon, 05 Dec 2011 13:36:05 GMT

Hi,

When you implement these service tasks using async continuations, the process execution should definitely be restarted after a server restart.
The job executor retries 3 times and then sets the job in a failed state. So maybe that happens in your case.
Then you can restart a job manually via the Activiti Explorer or automatically using the Activiti API.

Best regards,

Re: What happens to processes after server restart (Critical) ?

sazzadul — Mon, 05 Dec 2011 13:40:54 GMT

First and formost thank you for your reply.

We are using IBM websphere process server which has has this restart-proof capability.

EDIT and why can't you just do a manual update to the table to reset the status from active?

I can very well update the status but that itself will not trigger the execution of my JavaDelegate class and thus not update the hist tabell.

So I need to send a sinal so that activiti engine continues the flow from where it left as I do for the case of Receivetask.

Adding shutdown hooks is one thing

I am not sure what you are pointing at here. Could you please elaborate ?

Thanks again.

Re: What happens to processes after server restart (Critical) ?

sazzadul — Mon, 05 Dec 2011 13:45:16 GMT

When you implement these service tasks using async continuations, the process execution should definitely be restarted after a server restart.

Best regards,

OK, now I see the problem, you are quite correct about the job executor. It indeed run but from an another instance ( I saw this exception:
org.activiti.engine.ActivitiException: couldn't instantiate class storebrand.crm.servicetask.ServiceTaskThreeDelegate)

We have several webapps with job executor sharing the same db. But I guess the job execution is universal. So I need to add some functionality around
to make it work as a whole.

Then you can restart a job manually via the Activiti Explorer or automatically using the Activiti API.

I found the function call ManagementService.executeJob(String jobId)

And thanks a lot for your reply.

Re: What happens to processes after server restart (Critical) ?

heymjo — Tue, 06 Dec 2011 08:00:21 GMT

About the shutdown hooks: never mind. I thought it would be possible to add some task clean up stuff as a VM shutdown hook, but this IBM process server already seems way beyond that.