How to cancel or skip an ActivityTask which status is SCHEDULED

[maeer]

hello , I'm trying to cancel an ActivityTask in a workflow, its status like this :

Why I want to cancel ActivityTask:
Sometimes, To facilitate debugging,I want to specify the output of the ActivityTask, not run by the worker. In that case, the ActivityTask which is SCHEDULED should just be skipped ,then the next ActivityTask in the workflow should be SCHEDULED , and I use WorkflowExecutionSignaled event to specify the output of the skipped ActivityTask. And I want the ActivityTask which is skipped not polled by worker anymore.

Problem:
Now, I can not skip an ActivityTask, do you some ideas ?
Thank you !

[longquanzheng]

There is no such tool to skip a scheduled activity task . But You could write the workflow in a way that on receiving a signal then skip waiting for the results of the activity.

Could you tell more about the debugging? Do you just want to run a specific activity?

[maeer]

Sorry, I don’t quite understand the method you proposed. Do you mean put a worker to poll all the task in the tasklist, and determine whether complete by workflow ID and runID? That also need to store the workflow ID and runID of the skip task.

[maeer]

And if there is difficult to comminute in English, we can use Chinese. I use English just want to make others who have the same question easy to understand

[longquanzheng]

Yes basically. You should be able to do what you want by implementing the activity.

If you only want to complete activity by CLI, the activity implementation can just do a sleep forever then you can use CLI to complete it.

And sure, we can have some adhoc discussion on Slack. Either Chinese or English is fine. You should be able to find me on Cadence Slack.

[longquanzheng]

In Cadence there is no API start an activity by workflowID + activityID. The tasks are stored by tasklist and when calling PollForActivityTask to start them, worker doesn’t know which task until it receives one from the API response.

Technically it’s possible to add a new API like you said, just a bit tricky. I don’t think it’s worth the effort as we should have other way around.

For example, let a worker run to start all the activities but not return. Then you should be able to do whatever you want. There is no much difference compared to complete an scheduled activity, I believe.

[maeer]

OK, I'll use this method to solve this problem.
Thanks for your answer