topic Re: Task Migration using Activiti in distributed way in Alfresco Archive

Task Migration using Activiti in distributed way

asshetye — Fri, 14 Jun 2013 17:54:37 GMT

Hi,I am involved in research project where I need to migrate task over a set of host machines (i.e. to run the task in the data proximity rather than migrating the data like general scientific workflows.). The migration will be done by evaluating certain constraints in the process. I was wondering

Re: Task Migration using Activiti in distributed way

trademak — Mon, 17 Jun 2013 09:22:48 GMT

If you make the tasks in the process definition asynchronous our job executor will already do everything distributed (when using Activiti on multiple servers with the same database) by default. Or do you want specific distributed behavior?

Best regards,

Re: Task Migration using Activiti in distributed way

asshetye — Tue, 18 Jun 2013 00:43:04 GMT

Yes I want to particularly stop the task on one host and try to run it on different host (not halt the execution of task but halt the process before executing that task) and maybe bring back the control to the host originally running the process after finishing the task. Any ideas appreciated.

Best

Re: Task Migration using Activiti in distributed way

frederikherema1 — Tue, 18 Jun 2013 07:43:04 GMT

When an activity is marked as "async", the execution halts and the process-state is persisted. Next, the job is picked up by the job-executor and executes the "async" activity and all activities after it until a wait-state is reached, end is reached or another async-activity is reached.

You could, for example, disable the jobExecutor on machine1 and enable it only on machine2. All asynchronous activities are always executed on machine2. When you put receiveTasks of user tasks after the async-activities, machine1 can then see these tasks and complete them to continue execution of the process on machine1.

However, if you want to have a more flexible system, you should create you're own solution with some kind of queuing, combined with receive-task/signal mechanism to indicate the work on machine2 is finished.