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

    https://github.com/apache/spark/pull/18648#discussion_r132189977
  
    --- Diff: core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala 
---
    @@ -136,8 +136,15 @@ class SparkHadoopUtil extends Logging {
     
       def getSecretKeyFromUserCredentials(key: String): Array[Byte] = { null }
     
    -  def loginUserFromKeytab(principalName: String, keytabFilename: String) {
    -    UserGroupInformation.loginUserFromKeytab(principalName, keytabFilename)
    +  def loginUserFromKeytab(principalName: String, keytabFilename: String): 
Unit = {
    +    if (!new File(keytabFilename).exists()) {
    +      throw new SparkException(s"Keytab file: ${keytabFilename}" +
    +        " specified in spark.yarn.keytab does not exist")
    --- End diff --
    
    ok,notice that


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