Temporal UI (local) is just showing 8 running workflows at a time

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1

Hi all,

Temporal UI (local) is just showing 8 running workflows at a time.
9th workflow is not showing up.
When a signal is sent to the 9th workflow, WorkflowNotFoundException is thrown.

But after terminating one of the 8 running workflows, the 9th one shows up.

Is there any limit to the number of workflows that can be run at a time?

Temporal version used is 1.23.2

Thanks,
Joe

2

There is no limit on the number of open workflows. My guess is that the code that starts workflows is blocked on something.

3

Hi @maxim,

While checking the Temporal server logs, I am seeing the following error message:
"msg":"service failures","operation":"StartWorkflowExecution","wf-namespace":"temporal-system","error":"Not enough hosts to serve the request"

Could this be the issue?

Thanks,
Joe

4

It looks like your service is not configured correctly. How do you run it?

5

Hi @maxim,

I am running a Spring Boot application locally.
For starting worker and executing workflow, I have taken reference from HelloActivity.java.

For starting the Temporal server, I am using the below command:
temporal server start-dev --dynamic-config-value frontend.enableUpdateWorkflowExecution=true

Thanks,
Joe

6

I’m not sure what could cause this. Have you tried upgrading the temporal version?

brew upgrade temporal?

7

Yes, I am running on:
temporal version 0.11.0 (server 1.22.4) (ui 2.21.3)

8

I don’t think your issue is caused by the service. Have you checked your starter code?

9

Hi @maxim,

Figured out the issue: The controller used to trigger the workflow was annotated with @Async, but the workflow was started synchronously. It seems like there is some thread limit associated with using @Async.

Starting the workflow asynchronously did the trick.

Thanks,
Joe

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