External Task worker completing only 1 task each time.

[E_S]

Would like an input with this issue.
while creating BPMN I set serviceTask that has timeout above 3 minutes as external tasks as such:

per the user guide.
but when I ran the same process multiple times with the same task, the extrenalTaskHandler is not running tasks beyond the first unless the previous one is done. aka, running the tasks from the same topic synchronously instead of fetching max tasks of 10 and running them all parallelly.
I define my ExternalTaskHandler as such:

My assumption is that the worker that subscribed to specific topic should fetch all available tasks and run them parallelly. Can you advice on what I’m doing wrong? feeling like I’m missing some property config to allow it to run 10 tasks at the same time.

[hassang]

Hi @E_S

You can find the answer to your question in the following post

Multiple External Task Client instances

Hi @MichiDahm, this is expected behavior as you fetch up to 10 tasks. They will be handled sequentially in their handler. Each task takes 8 seconds and some milliseconds. So the 3rd task is unlocked before completion (locktime is 18 seconds) and is picked up in the fetch again. My proposal to use maxTasks=1 and lockTime long enough to complete the task. Then you can scale up starting additional workers for your topic. Hope this helps, Ingo