Questions related to the Cadence workflow engine
Product questions related to Uber Cadence Workflow Engine.
Questions tagged [cadence-workflow]
207 questions
45
votes
4 answers
Temporal workflow vs Cadence workflow
How is temporal.io related to cadenceworkflow.io? What should be used if starting a new project depending on the cadence workflow service?
Felix Mamonov
- 475
- 1
- 4
- 7
7
votes
2 answers
I don't get workflow, workflow automation or workflow orchestration
Why do we need special software like Uber's Cadence or Camunda or Activiti? If it's just a sequence of tasks then why can't we just code it? I've trying to read Camunda and Cadence's docs and just can't get into it. My company wants to use. The…
Zàf Mohammed
- 127
- 1
- 9
6
votes
1 answer
What is a good use case for a child workflow in Temporal or Uber Cadence?
I am trying to understand the use cases for a child workflow with Temporal/Uber Cadence. What is the advantage of a child workflow vs. simply splitting your workflow into functions? I have a rather complex workflow that I am considering splitting…
Maxim Fateev
- 6,458
- 3
- 20
- 35
5
votes
1 answer
What is the best way/pattern to process a signal in Cadence/Temporal workflow
When using signal like the doc suggests:
public class MyWorkflow{
public Output myWorkflwMethod(Input input){
...
}
public void mySignalMethod(request){
// do actual processing here.
...
}
}
I may run into the below…
Long Quanzheng
- 2,076
- 1
- 10
- 22
5
votes
1 answer
How to set proper timeout values for Cadence activities(local and regular activities, with or without retry)?
So there are so many timeout values:
For local activity:
ScheduleToClose timeout
For regular activity without retry:
ScheduleToStart timeout
ScheduleToClose timeout
StartToClose timeout
Heartbeat timeout
And then more values in…
Long Quanzheng
- 2,076
- 1
- 10
- 22
5
votes
2 answers
What exactly is a Cadence decision task?
Activity tasks are pretty easy to understand since it's executing an activity...but what is a decision task? Does the worker run through the workflow from beginning (using records of completed activities) until it hits the next "meaningful" thing it…
byang223
- 95
- 1
- 7
4
votes
1 answer
How does multi-threading works in Cadence/Temporal workflow?
In Cadence/Temporal workflow programming:
Native threading library is not allowed. E.g. in Java, threads must be created through Async.procedure or Async.function and in Golang, threads must be created through workflow.Go. So why?
Is there any…
Long Quanzheng
- 2,076
- 1
- 10
- 22
4
votes
1 answer
How to create custom workflow definitions?
We have requirements to let our users create their own workflows. Those workflows can have simple yes / no branching as well as waiting for a signal from an external event. This wouldn’t be such a problem if we had well established workflow…
martinni39
- 323
- 3
- 10
3
votes
1 answer
How to get `context.Context` from `workflow.Context`?
I'm implementing a Cadence Workflow that needs to call functions with context.Context parameters. How do I go about getting a context.Context from the workflow.Context? Is it just a matter of ctx.(*context.Context)?
Noel Yap
- 18,822
- 21
- 92
- 144
3
votes
1 answer
Workflow task failure.com.uber.cadence.internal.worker.WorkflowExecutionException: java.lang.IllegalAccessException
i am trying to execute the Cadence java client example provided in the https://cadenceworkflow.io/docs/06_javaclient/01_quick_start and getting the below exception when i am starting a work flow using the CLI
09:45:02.123 [Workflow Executor…
Pavan Kumar
- 31
- 5
3
votes
1 answer
Sending external events to a workflow
In our cadence workflow we often need to wait a certain amount of time for external events before continuing (ie Email read, link clicked, etc..).
I was wondering what was the best way to notify our workflows of these events. Are signals the right…
martinni39
- 323
- 3
- 10
2
votes
2 answers
Should I use child workflow or use activity to start new workflow
Like the title. Seems like both ways should work but child workflow seems easier.
Long Quanzheng
- 2,076
- 1
- 10
- 22
2
votes
1 answer
If we use multiple taskqueue in temporal, how my worker know which one to poll task?
If I set 10 video taskqueue in temporal matching, if we have 5 matching services, temporal will assign 2 video taskqueue for each matching service?
If I set 10 video taskqueue in temporal matching, if we have 50 workers for them, how are they…
zheyi yi
- 129
- 10
2
votes
1 answer
How to measure number of running workflows in cadence
I'd like to monitor in Prometheus number of cadence workflows currently running.
I checked metrics which are exported by different cadence services (like cadence_history, cadence_worker, cadence_frontend and so on) and the only workflows-related…
trivelt
- 1,913
- 3
- 22
- 44
2
votes
1 answer
Very high number of threads in active use in Cadence cluster
While performing the load testing of the cadence cluster, we are seeing extremely high number of threads ( > 4000) and it constantly remains like this consuming high CPU and memory. It remains like this, when there are no external signals or active…
Ezio
- 2,837
- 2
- 29
- 45