topic Re: Activiti engine increases CPU usage and thread count. in Alfresco Archive

Activiti engine increases CPU usage and thread count.

mahesh_yadav — Thu, 24 Apr 2014 07:08:27 GMT

Here is the issue that I am facing.I am using simple workflow with a script task and I am using below script task.def x = 0def y = 5while ( y > 0 ) { x++}which makes the execution as infinite. I have script task as 'async'. Also the 'lockTimeInMillis' setting i set it to 120000(2 mins). For ab

Re: Activiti engine increases CPU usage and thread count.

jbarrez — Thu, 24 Apr 2014 07:48:13 GMT

Yes, the jobs will be locked for a certain amount of time, before they are can be picked up by other threads.

Solution for this 'problem': limit the thread pool or set the lock time very very high.
Or put a timeout on the threadpool.

But if your job is infite … it doesnt sound like there is a right solution. Nor is there a use case for it?

Re: Activiti engine increases CPU usage and thread count.

mahesh_yadav — Fri, 25 Apr 2014 11:42:36 GMT

Thanks for you response.

Actually I was able to resolve the infinite loop issue in script task. I followed below approach.

1) Persisted task entry in my db for first call and set name of thread (it is async thread from activiti).
2) The above thread hangs in script task.
3) When activiti retries, I check db if entry exist in my db then i know that this is internal retry and not the retry because of failure (as i already disabled exception retry by activiti).
4) In this case I get all thread and find the thread with the current step id and stop it. After this throw exception so that this thread also dies.