Couldn't complete task Exception while resolving duedate 'P30S': P30S

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I am using the camunda-external-task-client-js lib to create create a simple node js app that will complete a external send message task

This external send message task works, but after the task complete method call, it gives the below error even though I have not set any duedate for my task

couldn’t complete task d813a33c-a620-11e8-af48-f49634ab846c, ENGINE-09027 Exception while resolving duedate ‘P30S’: P30S

raiseexceptionexternaltask
raiseexceptionexternaltask1331×572 56.5 KB

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Is this supposed to be 30 seconds? Its PT30S.
One of your timers is likely not configured correctly.

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also make sure to use timers that are larger than 1 minute. Camunda has issues with very short times.

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Thanks Stephen. it worked when i changed it to Minutes.

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I still have difficulties with the cyclic starts. No matter whether I try cron expressions or

R3/PT2M

with this entry, the cockpit shows these process instances:

CamundaTimers
CamundaTimers1313×256 11.1 KB

As you can see, the start times do not have anything to do with “start every 2 minutes”. What am I missing?

By the way: does Camunda plan to solve the issues with seconds? At least for test purposes, it would be very helpful.

Regards
Christian
.

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Hi @cjacob,

maybe this topic helps you further: Timer Execution too slow

Hope this helps, Ingo

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Hi Ingo,

your reply was a good starting point, but I had to research a little bit more, since I’m using Spring Boot. Finally, I ended up with this entries in my application.yaml:

camunda.bpm:
  job-execution:
    wait-time-in-millis: 500
    max-wait: 800

With these settings, even a cron expression of “0/5 * * * * ?” (which means “every 5 seconds”) triggered almost in time. But now I have some more questions:

  • Which implications do these values for wait-time-in-millis and max-wait have?
  • Why do I need them at all?

If the implications are stressing some resources too much, I’d rather think about using Spring’s capabilities of timed triggers and create a new process instance from there with runtimeService.createProcessInstanceByKey(…). Unfortunately, with this Spring approach my BPM model could not carry the timed starter event symbol any more…

Regards,
Christian

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Hi @cjacob,

sorry for the late reply,

The settings are all about balancing resource consumption over accuracy with timers.

For the most use cases, you don’t care about a time difference of a minute when you wait for time that will expire in several days. For this reason, the engine implemented a increasing wait interval between job acquisitions, if there are no jobs to execute.

You can control the interval with the max-wait setting: https://docs.camunda.org/manual/7.12/reference/deployment-descriptors/tags/job-executor/#job-acquisition-configuration-properties

Your configuration makes the engine to ask the database every half a second for new jobs.

It depends on the overall performance requirements to your system if it’s worth to check for this small intervals or not.

Hope this helps, Ingo

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