Dask-Kubernetes Example Internal Server Error

[isVoid]

When running dask_cuML_Exploration notebook, I ran into the following error:

kubernetes_asyncio.client.exceptions.ApiException: (500)
Reason: Internal Server Error
HTTP response headers: <CIMultiDictProxy('Audit-Id': '5ed8d1bf-dd87-4a29-ae0d-fa38c6dc254f', 'Cache-Control': 'no-cache, private', 'Content-Type': 'application/json', 'X-Kubernetes-Pf-Flowschema-Uid': 'db4c51d8-2442-4906-93b6-7ed03022eb2e', 'X-Kubernetes-Pf-Prioritylevel-Uid': 'aa178aa3-5472-418c-8f79-a301b839fda3', 'Date': 'Tue, 09 Aug 2022 01:17:22 GMT', 'Content-Length': '242')>
HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"The POST operation against Pod could not be completed at this time, please try again.","reason":"ServerTimeout","details":{"name":"POST","kind":"Pod"},"code":500}

The client environment is setup with this docker file:
https://github.com/isVoid/cloud-ml-examples/blob/f2683711b7ff5d1c3ae15ba41b4e828eccf8b2a3/dask/kubernetes/Dockerfile

Pod specs for worker and scheuler.

The cluster is setup on GCP and controlled from within the client's container.

[jacobtomlinson]

The ServerTimeout makes me wonder if this is one of those times where the GKE control plane goes unavailable due to resizing. What happens if you try again later?

[isVoid]

Tried 7 hours later and running into the same issue.

[isVoid]

In a local cluster, I tried setting up the pods with the same specs described above. The error I ran into this time is that when dask-kubernetes scale up a worker pod that has name defined, the control plan fails to scale up because attempts to create more worker pod using the same name defined in worker-spec.yaml. Not sure if this is the same 500 error I ran into as above, hopefully this may give some insight.

import dask_kubernetes
dask_kubernetes.__version__
'2022.7.0'

Environment from: https://jacobtomlinson.dev/posts/2022/running-kubeflow-inside-kind-with-gpu-support/

[jacobtomlinson]

I think this line should be name: dask-cuda-worker-{uuid} to ensure the name is unique.

cloud-ml-examples/dask/kubernetes/specs/worker-spec.yaml

Line 16 in f268371

name: dask-cuda-worker

[isVoid]

Doesn't seem to parameterize?

kubernetes_asyncio.client.exceptions.ApiException: (422)
Reason: Unprocessable Entity
HTTP response headers: <CIMultiDictProxy('Audit-Id': '01188928-aca4-4d94-9e8d-fc89df88e03f', 'Cache-Control': 'no-cache, private', 'Content-Type': 'application/json', 'X-Kubernetes-Pf-Flowschema-Uid': '7d3b09b3-048f-4edd-b335-46a87cfce5a2', 'X-Kubernetes-Pf-Prioritylevel-Uid': '13223eb9-a260-4d6f-b264-e6a6cede27c6', 'Date': 'Thu, 11 Aug 2022 22:00:17 GMT', 'Content-Length': '1537')>
HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"Pod \"gpu_worker\" is invalid: [metadata.name: Invalid value: \"gpu_worker\": a lowercase RFC 1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*'), spec.containers[0].name: Invalid value: \"dask-cuda-worker-{uuid}\": a lowercase RFC 1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character (e.g. 'my-name',  or '123-abc', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?')]","reason":"Invalid","details":{"name":"gpu_worker","kind":"Pod","causes":[{"reason":"FieldValueInvalid","message":"Invalid value: \"gpu_worker\": a lowercase RFC 1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')","field":"metadata.name"},{"reason":"FieldValueInvalid","message":"Invalid value: \"dask-cuda-worker-{uuid}\": a lowercase RFC 1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character (e.g. 'my-name',  or '123-abc', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?')","field":"spec.containers[0].name"}]},"code":422}

[jacobtomlinson]

Looks like you have an underscore in the name which is not a valid character.