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

    https://github.com/apache/spark/pull/5321#discussion_r27639338
  
    --- Diff: core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala 
---
    @@ -93,6 +91,9 @@ class SparkHadoopUtil extends Logging {
             if (key.startsWith("spark.hadoop.")) {
               hadoopConf.set(key.substring("spark.hadoop.".length), value)
             }
    +        if (key.startsWith("spark.yarn.")) {
    --- End diff --
    
    This is simple but feels hacky. You're setting non-Hadoop props in the 
Hadoop config and relying on Hadoop doing some variable expansion.


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