Something like p-map can be useful if you care about concurrency over a bunch of async tasks + simpl

Something like p-map can be useful if you care about concurrency over a bunch of async tasks + simplifies failure handling: https://www.npmjs.com/package/p-map

but if you just need a while loop, use a while loop!

SSODaLC Are there any rules/consequence to using while loops in a step? I want to retr...

Matt SilverlockOP•10/28/25, 4:48 PM

Just note that (this is not specific to Workflows) that while (condition) { await step.do(...) } while (condition) { await step.do(...) } will block on each

await

await

before it iterates.

xenophyte1234•10/29/25, 3:53 AM

question about waitForEvent, sometimes, even the event is fired, the waitForEvent is still waiting. This happens to the workflow that has waited for more than 20 minutes, do I miss something? Is it because I put the waitForEvent inside a step.do?

Xxenophyte1234 question about waitForEvent, sometimes, even the event is fired, the waitForEven...

Hunter Bertoson•10/29/25, 4:09 AM

Could be. I would not do that. waitForEvent is its own step.

Olriko•10/29/25, 8:49 AM

Hello, there is a plan to support the new framework https://useworkflow.dev/ ?

Workflow DevKit - Make any TypeScript Function Durable

"use workflow" brings durability, reliability, and observability to async JavaScript. Build apps and AI Agents that can suspend, resume, and maintain state with ease.

MMatt Silverlock Just note that (this is not specific to Workflows) that `while (condition) { awa...

SODaLC•10/29/25, 12:53 PM

it does sound so simple after saying that. I was just more worried about how the workflow would resume if sleeping inside a while loop and if i would encounter potential billing runaways from the loops.

MMatt Silverlock Something like p-map can be useful if you care about concurrency over a bunch of...

SODaLC•10/29/25, 12:57 PM

now that is pretty cool, definitely useful for my project, thanks

xvvvyz•10/29/25, 8:07 PM

what is the expected behavior when you terminate a workflow?

it says it's not implemented locally, and in cloudflare steps continue to run.

couldn't find details in the docs.

Lulu•10/29/25, 8:57 PM

So I am really confused about the use cases of Workflows vs Queues. Seems like anything you could do in one you could also do in the other. Are there specific parameters (like limits, costs, performance, etc.) that I should keep in mind when deciding?

Paul•10/29/25, 9:34 PM

I have a pattern I'm using now where a Consuming Worker is pulling events off a Queue and then it just starts a Workflow. Are there plans to support Workflows as Queue consumers, so we can drop the consuming Worker form the flow?

OOlriko Hello, there is a plan to support the new framework https://useworkflow.dev/ ?

Paul•10/29/25, 9:52 PM

That framework looks really interesting, but it wasn't clear reading the site, does this have some kind of bridge to Cloudflare Workflows? Maybe I missed it, but I was hoping there was some kind of way to just deploy your Typescript funciton into a Cloudflare Workflow?

vijayaraagavan•10/30/25, 7:19 AM

How to get updates from workflow other than polling? Does polling every second cause rate limiting?

Vvijayaraagavan How to get updates from workflow other than polling? Does polling every second c...

1984 Ford Laser•10/30/25, 9:03 AM

You could have the Workflow send an event to a Worker or something to track updates

Tuna•10/30/25, 9:31 AM

can i call a workflow from a step inside a workflow??

D Trombett•10/30/25, 9:35 AM

Yes

ajay | dreamlit.ai•10/30/25, 2:56 PM

Hey @avenceslau We have been encountering Workflow instances that occasionally are terminating on their own while running and aren't throwing an error as expected. It seems to occur about once a day now, and it requires manual intervention for us to kick the workflow off again.

Essentially these Workflow instances appear to be receiving a "terminate" signal but we are not the ones initiating them. Any idea on what might be up?

scook•10/30/25, 7:40 PM

Correct me if I'm wrong, but is there really not a way to use wrangler CLI to trigger a workflow for local dev??

jepcd•10/31/25, 12:49 AM

minor suggestion: display error messages on the dashboard/api

currently, a

throw new NonRetryableError("File too big!")

throw new NonRetryableError("File too big!")

just shows up as

The execution of the Workflow instance was terminated, as a step threw an NonRetryableError and it was not handled

The execution of the Workflow instance was terminated, as a step threw an NonRetryableError and it was not handled

PPaul That framework looks really interesting, but it wasn't clear reading the site, d...

Olriko•10/31/25, 10:58 AM

No bridge to Cloudflare Workflows currently exists, but since the framework is open source, a Cloudflare world (https://useworkflow.dev/docs/deploying/world) is possible. Imo, the syntax is cleaner than the current CF class approach.

Nathan Scheele•10/31/25, 3:47 PM

I started getting the following error when sending events to a Workflow Instance that is waiting. See attached for implementation of waitForEvent and sendEvent. This setup has been working fine up until now. This seems to only be an issue locally; deployed versions are working as expected.

error.txt877B

sendEvent.ts147B

waitForEvent.ts185B

OOlriko No bridge to Cloudflare Workflows currently exists, but since the framework is o...

Paul•10/31/25, 3:50 PM

My analysis indicates it's not a fit.

cloudflare-adapter-analysis.pdf1.56MB

jepcd•11/1/25, 12:16 AM

I'm seeing a lot of persistent internal server errors when accessing the workflows dashboard.

Additionally, some steps still show as running, around 20 minutes after I terminated the instance. Is that expected?

fwiw this was probably caused by some bad workflow code I was testing that causes the step hang, but I wouldn't expect the dashboard to internal server error.

Instance ID: 1ededc19-f498-4e11-947d-b3cbb507cf18

Sathyamshu•11/1/25, 12:29 AM

Why is there a limit for the concurrent workflow invocations (10k)

This blocks the things a lot.

Assume a workflow is used to remind after 30 days sign-up.
If 10k users sign up in a day or week...

That's it.. can't invoke any other workflow.

Is there any solution for this??
How to approach this kindaa things?
Or
Is it better to implement on own using workers and some other ?,

SSathyamshu Why is there a limit for the concurrent workflow invocations (10k) This blocks ...

1984 Ford Laser•11/1/25, 12:40 AM

You could combine with Queues for batching and delays

SSathyamshu Why is there a limit for the concurrent workflow invocations (10k) This blocks ...

Seekerdasbatatas•11/1/25, 10:45 AM

If an instance is in a waitingwaiting state (following your example, sleeping for 30 days), it does not count towards the concurrent invocation limit - only instances with a runningrunning state will count towards the limit

SSeekerdasbatatas If an instance is in a `waiting` state (following your example, sleeping for 30 ...

Sathyamshu•11/1/25, 12:32 PM

okay...got it...!

but still, why is there a limit? can't they be just like the workers with no concurrent limits for invocations/executions?

Am I thinking right??

SSathyamshu okay...got it...! but still, why is there a limit? can't they be just like the...

Seekerdasbatatas•11/1/25, 12:42 PM

Workers are stateless and don't need to store state - Workflows are inherently stateful because we need to ensure that your instances always run in a timely fashion, even if some attempt fails (so we need to persist your step returns and metadata) - hence the limit, but we are working to potentially increase it even further :soontm:

InspectorT•11/2/25, 3:20 PM

Any info on if Workflow bindings will be supported in wrangler's getPlatformProxy API?

1984 Ford Laser•11/4/25, 4:38 AM

Can Workflows be paused/restarted from within the instance itself? Minus the REST API

Celestial Rose•11/4/25, 8:15 AM

hey ! this is kind of a n00b question but asking anyway

i am using caches.default on a Worker to cache a R2 file being server. I see that the response headers show CACHE HIT and a Max Age. If I fetch it with Cache Control no-store using fetch, is it still being served the Cached R2 file ? Or is the request header overriding the Worker's Cache behaviour ? Thanks !

CCelestial Rose hey ! this is kind of a n00b question but asking anyway 😂 i am using caches.def...

Celestial Rose•11/4/25, 8:16 AM

I am 100% sure its still serving the Cached key but just to make sure.

森森@VerseLink (RW)when i run workflow locally, occasionally i get this error ``` workerd/jsg/setup...

divby0•11/4/25, 8:19 AM

This happens to me to, the second I try to launch browser rendering inside a workflow. This should be a supported usecase, right?

Ddivby0 This happens to me to, the second I try to launch browser rendering inside a wor...

Seekerdasbatatas•11/4/25, 9:42 AM

does this happen only within local dev?

divby0•11/4/25, 9:48 AM

For now I only tested in local, thinking I don't even need to deploy it if I can't get it working local. Only thing I tried was setting the browser remote:true option which didn't (remarkably) make any difference, but crashed the whole miniflare process.

Does that suffice or would actually deploying the application help? I don't have the deployment set up right now but could get to it soon

Ddivby0 For now I only tested in local, thinking I don't even need to deploy it if I can...

Seekerdasbatatas•11/4/25, 9:50 AM

it shouldn't happen in a production env AFAIK, but ty for letting us know, I'll raise it with the rest of the team :MeowHeartCloudflare: (and sorry for inconvenience)

SODaLC•11/4/25, 2:14 PM

Does a step fail silently if the returned amount is more than the 1MiB? Its the only conclusion i can reach as to why my step is constantly restarting.

1984 Ford Laser•11/5/25, 1:11 AM

Has anyone tried creating a flow where a Workflow is paused when an error occurs (after an appropriate number of retries), a user/client is notified of an issue, manual intervention occurs, then the Workflow is resumed from the same point (before the current step perhaps) to continue executing? This feels like it would be very involved to orchestrate, and I would need to call out to the REST API or another Worker to be able to pause the invocation from within

.r20•11/5/25, 6:31 PM

We are seeing an overwhelming amount of "Attempt failed due to internal workflows error" again

.r20•11/5/25, 6:34 PM

What's weird is it's saying
The execution of the Workflow instance was terminated, as a step threw an NonRetryableError and it was not handled

and the internal workflows error as well

xvvvyz•11/6/25, 5:16 AM

If I have a workflow that executes steps in parallel and one step fails while the others are still running, what happens? Do the others finish or are they terminated?

SSeekerdasbatatas it shouldn't happen in a production env AFAIK, but ty for letting us know, I'll ...

divby0•11/6/25, 8:35 AM

Something else I noticed: The success rate is much lower than 50%, maybe 20%. But its not per browser launch, its per wrangler launch (process?) meaning its sticky. If it works once, it works until the next restart, even across hot reloads. If I restart, I might have to try 5-6 times until I hit success. Maybe that helps diagnosing

stephen•11/6/25, 4:44 PM

I need architecture / design guidance on my Workflow.

I have my MAIN workflow with several steps. It's working fine as-is. In step N, it produces a file (sends it to R2). As soon as the file drops onto R2, I want another, independent workflow (Worker + DO + WF) to start. How best do I trigger my other workflow so that my MAIN workflow doesn't get bogged down by the multi-step processing of this other workflow?

Sstephen I need architecture / design guidance on my Workflow. I have my MAIN workflow w...

stephen•11/6/25, 4:50 PM

Docs AI wasn't any help.

Screenshot_2025-11-06_at_10.48.49_AM.png

Sstephen I need architecture / design guidance on my Workflow. I have my MAIN workflow w...

PhoenixSpace•11/6/25, 5:06 PM

You can trigger the start of the workflow from the main one via workers bindings, but if you want true separation of concerns, why not use a queue? You can push a message to start the next one or use https://developers.cloudflare.com/reference-architecture/diagrams/storage/event-notifications-for-storage/

Cloudflare Docs

Event notifications for storage

Use Cloudflare Workers or an external service to monitor for notifications about data changes and then handle them appropriately.

PPhoenixSpace You can trigger the start of the workflow from the main one via workers bindings...

stephen•11/6/25, 5:11 PM

Thanks! This is why I asked.

I'll look into Queues.

Sstephen I need architecture / design guidance on my Workflow. I have my MAIN workflow w...

Matt SilverlockOP•11/6/25, 10:06 PM

You can also just... call the other Workflow. Call it, and if it successfully starts, that's it. Your "main" Workflow instance won't be blocked.

Sstephen I need architecture / design guidance on my Workflow. I have my MAIN workflow w...

Matt SilverlockOP•11/6/25, 10:07 PM

await step.do("kick off next workflow", {
    return await env.WORKFLOW.create(...)
})

await step.do("kick off next workflow", {
    return await env.WORKFLOW.create(...)
})

There's nothing special here. If the other workflow fails to start, it'll fail the step — just like any other API call — and invoke your retry logic. If it starts, it'll return the instance data and the step will be successful.

confusionprevails•11/7/25, 12:07 PM

is the workflow API docs site down?
https://developers.cloudflare.com/api/resources/workflows/methods/list/

confusionprevails•11/7/25, 12:12 PM

Another question -- where do i see logs for workflows, eg any logging that workflow does, how do i see those logs?

scook•11/8/25, 6:36 PM

I had a workflow that failed in production with nothing more than

internal error

internal error

. It shows "Errored" in the dashboard. Is there any more investigation I can do to know what happened? Instance: bd1a0c85-6f10-451d-a91b-ee229909d0a6

HK•11/8/25, 7:12 PM

how can I deploy a workflow in a nextjs or tanstack start wrangler project? where do I export the workflow class. workflows needs to be exported in a

src/index.ts

src/index.ts

Something like p-map can be useful if you care about concurrency over a bunch of async tasks + simpl

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