Graceful shutdown of one workflow instance. about workflow

[Randgalt]

You are in control of submitting new tasks. So, you could just stop submitting new tasks and then use the admin APIs to watch for current tasks to finish. Does that work for you?

[gs-rchejerla]

Thank you for response.
In my use case, there are set of workflow instances running. I wanted to take down one instance without affecting other workflow instance.

I can very well kill that instance I wanted to take down, according to Nirmata's design other instances will pick-up running tasks(if idempotent) automatically.

But, in my case, these tasks are very time consuming ones, so I don't want to terminate them abnormally. So I was looking for any other ways to tell workflow manager to stop listening to new tasks, then I can wait till completion of already running tasks and terminate that instance.

Thank you again.

[Randgalt]

OK - it's definitely possible. I don't have time to do it right now. I'd appreciate a PR or I'll get to it when I can.

[gs-rchejerla]

I forked the project, will add the feature of stopping workflow gracefully in workflowmanager API.
Before I start, could you please tell me, if any thing I need to know.

Thank you.

[Randgalt]

You'd:

• Add an API to WorkflowManager - something like gracefulShutdown(maxWait)
• The main work is in SimpleQueue - Call shutdown on the executorService then awaitTermination

Something like that

[gs-rchejerla]

Thank you for the quick response, will send pull request once done with that.