Github user StephanEwen commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2917#discussion_r90510382
  
    --- Diff: flink-core/src/main/java/org/apache/flink/util/NetUtils.java ---
    @@ -309,6 +313,19 @@ public static ServerSocket 
createSocketFromPorts(Iterator<Integer> portsIterator
                return null;
        }
     
    +   /**
    +    * Returns the wildcard address to listen on all interfaces.
    +    * @return Either 0.0.0.0 or :: depending on the IP setup.
    +    */
    +   public static String getWildcardIPAddress() {
    --- End diff --
    
    You could move that code into a static initializer. That way you don't need 
to lock and check if it was set before.


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