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

    https://github.com/apache/spark/pull/15377#discussion_r83181601
  
    --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
    @@ -2479,20 +2483,35 @@ private[spark] class CallerContext(
        * [[org.apache.hadoop.ipc.CallerContext]], which was added in hadoop 
2.8.
        */
       def setCurrentContext(): Boolean = {
    -    var succeed = false
    -    try {
    -      // scalastyle:off classforname
    -      val callerContext = 
Class.forName("org.apache.hadoop.ipc.CallerContext")
    -      val Builder = 
Class.forName("org.apache.hadoop.ipc.CallerContext$Builder")
    -      // scalastyle:on classforname
    -      val builderInst = 
Builder.getConstructor(classOf[String]).newInstance(context)
    -      val hdfsContext = Builder.getMethod("build").invoke(builderInst)
    -      callerContext.getMethod("setCurrent", callerContext).invoke(null, 
hdfsContext)
    -      succeed = true
    -    } catch {
    -      case NonFatal(e) => logInfo("Fail to set Spark caller context", e)
    +    if (!CallerContext.callerContextSupported) {
    +      false
    +    } else {
    +      if 
(!SparkHadoopUtil.get.conf.getBoolean("hadoop.caller.context.enabled", false)) {
    +        logInfo("Hadoop caller context is not enabled")
    +        CallerContext.callerContextSupported = false
    +        false
    +      } else {
    +        try {
    +          // scalastyle:off classforname
    --- End diff --
    
    Remove this comment.


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