renxiaoyao opened a new pull request, #22433:
URL: https://github.com/apache/flink/pull/22433

   ## What is the purpose of the change
   
   * Add Hostname enum val to kubernetes NodeAddress type.* Class 
io.fabric8.kubernetes.api.model.NodeAddress.type contains 
'InternalIP','ExternalIP' and 'Hostname'. The InternalIP address is unavailable 
in the private cloud environment. But the hostname can be resolved by the DNS 
server. So 
'org.apache.flink.kubernetes.configuration.NodePortAddressType.NodePortAddressType'
 should add 'Hostname' enumeration value.
   
   
   ## Brief change log
   
   ```
       public enum NodePortAddressType {
           InternalIP,
           ExternalIP,
       }
   ```
   Upgrade to:
   ```
       public enum NodePortAddressType {
           InternalIP,
           ExternalIP,
           Hostname
       }
   ```
   
   
   ## Verifying this change
   
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`:  no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no
   
   


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