client.CoreV1Api.read_namespaced_pod(pod_name, pod_namespace) returning incomplete data for several minutes after pod is deployed

[chickling123]

client.CoreV1Api.read_namespaced_pod(pod_name, pod_namespace) returns incomplete data for several minutes after pod is deployed if it is queried as soon as pod is deployed.

A bit more detail ...
I am deploying a pod and then immediately using the read_namespaced_pod method to determine the pod IP. Here is an outline of the code I am running. pod_ip is set to None for several minutes after the pod is deployed, and well after I can query the pod IP using kubectl describe pod <pod_name> . Presumably the read_namespaced_pod is returning a cached result that contains incomplete data.

pod = read_namespaced_pod(pod_name, pod_namespace)
pod_ip = pod.status.pod_ip

I've worked around this for now by inserting a 10s sleep after a pod is deployed before attempting to determine the pod_ip. That appears to be consistently working.

[showjason]

Hi, I guess it's due to the pod status is not running, the network is creating and ip for this pod is not ready.
When the pod status is running, which means a certain ip has been assigned to the pod, meanwhile it also has been added to the pod status section and stored in etcd. After that you can run your code to get the pod ip.

[roycaihw]

/assign @showjason