Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/16923#discussion_r102358896 --- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala --- @@ -106,21 +106,27 @@ private[hive] class HiveClientImpl( // Set up kerberos credentials for UserGroupInformation.loginUser within // current class loader - // Instead of using the spark conf of the current spark context, a new - // instance of SparkConf is needed for the original value of spark.yarn.keytab - // and spark.yarn.principal set in SparkSubmit, as yarn.Client resets the - // keytab configuration for the link name in distributed cache - if (sparkConf.contains("spark.yarn.principal") && sparkConf.contains("spark.yarn.keytab")) { + if (sparkConf.contains("spark.yarn.principal")) { --- End diff -- One sort of hacky way is to have `ApplicationMaster.scala` override the value of `KEYTAB` in the configuration with the value of `AM_KEYTAB`. Then this code just needs to look at "spark.yarn.keytab" to cover both cases.
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