I have an “always running” workflow that holds a state like a semaphore. Before every Activity execution that depends on this semaphore state, I have a Workflow code snippet that loops “forever” until the semaphore is “green”: Pseudo-code: export async function waitForGreenState(): Promise<Semaph…

A common approach for this kind of thing is to have myWorkflow send a “requestLock” signal to the semaphore Workflow, with its own Workflow ID as argument, then wait for an incoming “lockGranted” signal. The semaphore workflow maintain a list of pending requests. When the semaphore become green, th…

For context, this polling is done every 30s now. I wanna avoid a “subscriber” pattern because the workflow using semaphore-state-workflow-id can be stopped any time and re-started with the same id, so we would lose control of what other workflows are waiting for the signal. I also want to avoid ma…

For every 30 seconds, you can fail the activity with 30 seconds retry interval. That would avoid growing workflow history indefinitely if polling takes long time.

But then I would need to not set a maximumAttempts (or set it to 0), right?

Just don’t set them. I personally would never use maximuAttempts. ScheduleToClose timeout makes much more sense to me.

I get your point and agree with it, but in our context the requirement is the exact opposite :sweat_smile: In our use case, how long the workflow takes to complete is secondary, we rather know that our activity is failing earlier and that we need to take action, so the activities are coded with the…

I think the timeout is more predictable than the retry count. And it can be short if your use case requires this.

Wait for condition between retries

Community Support

maxim June 22, 2023, 6:24pm 2

I wouldn’t poll from the workflow: What is the best practice for a polling activity? - #2 by maxim

Topic		Replies	Views
Java wait for signal and retry the activity if not received within some seconds Community Support java-sdk	1	647	September 19, 2023
What is the best practice for a polling activity? Community Support go-sdk , activity , polling	20	19925	November 25, 2024
Resume / retry activity upon receiving signal in a workflow Community Support java-sdk , general-impl	7	578	March 26, 2024
Long polling inside workflows or activities Community Support polling	8	2447	March 22, 2024
Long polling workflow with pending activities Community Support go-sdk	3	377	May 28, 2024

Wait for condition between retries

Related topics