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

    https://github.com/apache/spark/pull/13543#discussion_r66501686
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/master/MasterArguments.scala ---
    @@ -20,18 +20,24 @@ package org.apache.spark.deploy.master
     import scala.annotation.tailrec
     
     import org.apache.spark.SparkConf
    +import org.apache.spark.internal.Logging
     import org.apache.spark.util.{IntParam, Utils}
     
     /**
      * Command-line parser for the master.
      */
    -private[master] class MasterArguments(args: Array[String], conf: 
SparkConf) {
    +private[master] class MasterArguments(args: Array[String], conf: 
SparkConf) extends Logging {
       var host = Utils.localHostName()
       var port = 7077
       var webUiPort = 8080
       var propertiesFile: String = null
     
       // Check for settings in environment variables
    +  if (System.getenv("SPARK_MASTER_IP") != null) {
    +    logWarning("SPARK_MASTER_IP is deprecated, please use 
SPARK_MASTER_HOST")
    +    host = System.getenv("SPARK_MASTER_IP")
    +  }
    +
       if (System.getenv("SPARK_MASTER_HOST") != null) {
    --- End diff --
    
    The script sets --host to the value of SPARK_MASTER_HOST though, and I 
think that's considered the only valid way to start the master. It is a little 
behavior change but I was wondering if it's best to go ahead and move any 
unofficial use case away from env variables anyway.


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