topic Re: clustering with async tasks and the async executor in Alfresco Archive

clustering with async tasks and the async executor

amalinky — Tue, 31 May 2016 21:21:38 GMT

Greetings! I'm using Activiti 5.17 with SpringBoot, using an external postgres DB. I have a bunch of established simple workflows that are all some number of Java service tasks in a row, like startEvent -> serviceTask1 -> serviceTask2 -> theEnd. These are submitted by an external scheduler

Re: clustering with async tasks and the async executor

amalinky — Tue, 31 May 2016 21:23:40 GMT

My XML got eaten

Here's the test BPMN referred to above (hopefully):

<process id="AsyncPOCWF" name="Async POC WF">

        <serviceTask id="task-1" name="Task 1" activiti:class="com.blahblah.AsyncPOCTest" activiti:async="true" />
        <serviceTask id="task-2" name="Task 2" activiti:class="com.blahblah.AsyncPOCTest" activiti:async="true" />
        <serviceTask id="task-3" name="Task 3" activiti:class="com.blahblah.AsyncPOCTest" activiti:async="true" />
        <serviceTask id="task-4" name="Task 4" activiti:class="com.blahblah.AsyncPOCTest" activiti:async="true" />
        <serviceTask id="task-5" name="Task 5" activiti:class="com.blahblah.AsyncPOCTest" activiti:async="true" />

        <startEvent id="theStart"/>
        <sequenceFlow sourceRef="theStart" targetRef="task-1"/>
        <sequenceFlow sourceRef="task-1" targetRef="task-2"/>
        <sequenceFlow sourceRef="task-2" targetRef="task-3"/>
        <sequenceFlow sourceRef="task-3" targetRef="task-4"/>
        <sequenceFlow sourceRef="task-4" targetRef="task-5"/>
        <sequenceFlow sourceRef="task-5" targetRef="theEnd"/>
        <endEvent id="theEnd"/>
</process>

Re: clustering with async tasks and the async executor

jbarrez — Fri, 03 Jun 2016 07:48:32 GMT

The 'problem' is that the Async executor will continue to take on work on the same, unless its queue is full …

so if you give it more work … it'll not be able to cope. And I think the default is 100 indeed 😉
Or you can make the queue size smaller to force that behaviour.