Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9272#discussion_r44863636
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/ClientWrapper.scala ---
@@ -149,6 +151,26 @@ private[hive] class ClientWrapper(
val original = Thread.currentThread().getContextClassLoader
// Switch to the initClassLoader.
Thread.currentThread().setContextClassLoader(initClassLoader)
+
+ // 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
specified by user,
+ // as yarn.Client resets it for the link name in distributed cache
+ val sparkConf = new SparkConf
+ if (sparkConf.contains("spark.yarn.principal") &&
sparkConf.contains("spark.yarn.keytab")) {
--- End diff --
Let's make it clear that we set these two settings in SparkSubmit.
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