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

    https://github.com/apache/spark/pull/6166#discussion_r30452124
  
    --- Diff: 
yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala ---
    @@ -262,6 +266,50 @@ private[spark] class ApplicationMaster(
     
       private def runDriver(securityMgr: SecurityManager): Unit = {
         addAmIpFilter()
    +    if (isClusterMode) {
    +      val containerId = ConverterUtils.toContainerId(
    +        
System.getenv(ApplicationConstants.Environment.CONTAINER_ID.name()))
    +      val yarnClient = YarnClient.createYarnClient()
    +      yarnClient.init(yarnConf)
    +      yarnClient.start()
    +      val addresses =
    --- End diff --
    
    The intent here is to ensure that we compare all possible hostnames for 
this node against the one that is in the NodeReport. It is possible there are 
multiple interfaces with different hostnames, so better be safe.


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