zhoulii commented on pull request #12849:
URL: https://github.com/apache/flink/pull/12849#issuecomment-655387112
`final ClusterDescriptor<String> kubernetesClusterDescriptor =
kubernetesClusterClientFactory.createClusterDescriptor(configuration);`
above code will create **KubernetesClusterDescriptor**, and in
[KubernetesClusterDescriptor construct
method](https://github.com/apache/flink/blob/master/flink-kubernetes/src/main/java/org/apache/flink/kubernetes/KubernetesClusterDescriptor.java#L79)
，we already check the value of clusterId, if clusterId value is null，a
NullPointerException will be thrown.
so, when execute code `if (clusterId != null &&
kubeClient.getRestService(clusterId).isPresent())` ，clusterId must not be null
@KarmaGYZ
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