#Troubleshooting common problems with distributed workloads for users

If you are experiencing errors in Alauda AI relating to distributed workloads, read this section to understand what could be causing the problem, and how to resolve the problem.

If the problem is not documented here or in the release notes, contact Alauda Support.

#My Ray cluster is in a suspended state

#Problem

The resource quota specified in the cluster queue configuration might be insufficient, or the resource flavor might not yet be created.

#Diagnosis

The Ray cluster head pod or worker pods remain in a suspended state.

#Resolution

1. In Administrator view, navigate to Clusters -> Resources.

2. Check the workload resource: i. Click Search, and from the Resources list, select Workload. ii. Select the workload resource that is created with the Ray cluster resource, and click the YAML tab. iii. Check the text in the status.conditions.message field, which provides the reason for the suspended state, as shown in the following example:

   status:
     conditions:
       - lastTransitionTime: '2024-05-29T13:05:09Z'
         message: "couldn't assign flavors to pod set small-group-jobtest12: insufficient quota for nvidia.com/gpu in flavor default-flavor in ClusterQueue"

3. Check the Ray cluster resource: i. Click Search, and from the Resources list, select RayCluster. ii. Select the Ray cluster resource, and click the YAML tab. iii. Check the text in the status.conditions.message field.

4. Check the cluster queue resource: i. Click Search, and from the Resources list, select ClusterQueue. ii. Check your cluster queue configuration to ensure that the resources that you requested are within the limits defined for the project. iii. Either reduce your requested resources, or contact your administrator to request more resources.

#My Ray cluster is in a failed state

#Problem

You might have insufficient resources.

#Diagnosis

The Ray cluster head pod or worker pods are not running. When a Ray cluster is created, it initially enters a failed state. This failed state usually resolves after the reconciliation process completes and the Ray cluster pods are running.

#Resolution

If the failed state persists, complete the following steps:

1. In Administrator view, navigate to Clusters -> Resources.
2. Click Search, and from the Resources list, select Pod.
3. Click your pod name to open the pod details page.
4. Click the Events tab, and review the pod events to identify the cause of the problem.
5. If you cannot resolve the problem, contact your administrator to request assistance.

#I see a "failed to call webhook" error message for Kueue

#Problem

After you run the cluster.apply() command, the following error is shown:

ApiException: (500)
Reason: Internal Server Error
HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"Internal error occurred: failed calling webhook \"mraycluster.kb.io\": failed to call webhook: Post \"https://kueue-webhook-service.redhat-ods-applications.svc:443/mutate-ray-io-v1-raycluster?timeout=10s\": no endpoints available for service \"kueue-webhook-service\"","reason":"InternalError","details":{"causes":[{"message":"failed calling webhook \"mraycluster.kb.io\": failed to call webhook: Post \"https://kueue-webhook-service.redhat-ods-applications.svc:443/mutate-ray-io-v1-raycluster?timeout=10s\": no endpoints available for service \"kueue-webhook-service\""}]},"code":500}

#Diagnosis

The Kueue pod might not be running.

#Resolution

Contact your administrator to request assistance.

#My Ray cluster does not start

#Problem

After you run the cluster.apply() command, when you run either the cluster.details() command or the cluster.status() command, the Ray Cluster remains in the Starting status instead of changing to the Ready status. No pods are created.

#Diagnosis

1. In Administrator view, navigate to Clusters -> Resources.

2. Check the workload resource: i. Click Search, and from the Resources list, select Workload. ii. Select the workload resource that is created with the Ray cluster resource, and click the YAML tab. iii. Check the text in the status.conditions.message field, which provides the reason for remaining in the Starting state.

3. Check the Ray cluster resource: i. Click Search, and from the Resources list, select RayCluster. ii. Select the Ray cluster resource, and click the YAML tab. iii. Check the text in the status.conditions.message field.

#Resolution

If you cannot resolve the problem, contact your administrator to request assistance.

#I see a "Default Local Queue not found" error message

#Problem

After you run the cluster.apply() command, the following error is shown:

Default Local Queue with kueue.x-k8s.io/default-queue: true annotation not found please create a default Local Queue or provide the local_queue name in Cluster Configuration.

#Diagnosis

No default local queue is defined, and a local queue is not specified in the cluster configuration.

#Resolution

1. In Administrator view, navigate to Clusters -> Resources.
2. Click Search, and from the Resources list, select LocalQueue.
3. Resolve the problem in one of the following ways:
   • If a local queue exists, add it to your cluster configuration as follows:

     local_queue="<local_queue_name>"
   • If no local queue exists, contact your administrator to request assistance.

#I see a "local_queue provided does not exist" error message

#Problem

After you run the cluster.apply() command, the following error is shown:

local_queue provided does not exist or is not in this namespace. Please provide the correct local_queue name in Cluster Configuration.

#Diagnosis

An incorrect value is specified for the local queue in the cluster configuration, or an incorrect default local queue is defined. The specified local queue either does not exist, or exists in a different namespace.

#Resolution

1. In Administrator view, navigate to Clusters -> Resources.
2. Click Search, and from the Resources list, select LocalQueue.
3. Resolve the problem in one of the following ways:
   • If a local queue exists, ensure that you spelled the local queue name correctly in your cluster configuration, and that the namespace value in the cluster configuration matches your project name. If you do not specify a namespace value in the cluster configuration, the Ray cluster is created in the current project.
   • If no local queue exists, contact your administrator to request assistance.

#My pod provisioned by Kueue is terminated before my image is pulled

#Problem

Kueue waits for a period of time before marking a workload as ready for all of the workload pods to become provisioned and running. By default, Kueue waits for 5 minutes. If the pod image is very large and is still being pulled after the 5-minute waiting period elapses, Kueue fails the workload and terminates the related pods.

#Diagnosis

1. In Administrator view, navigate to Clusters -> Resources.
2. Click Search, and from the Resources list, select Pod.
3. Click the Ray head pod name to open the pod details page.
4. Click the Events tab, and review the pod events to check whether the image pull completed successfully.

#Resolution

If the pod takes more than 5 minutes to pull the image, contact your administrator to request assistance.