Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/9272#discussion_r43867512
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/ClientWrapper.scala ---
@@ -150,6 +152,14 @@ private[hive] class ClientWrapper(
val original = Thread.currentThread().getContextClassLoader
// Switch to the initClassLoader.
Thread.currentThread().setContextClassLoader(initClassLoader)
+
+ val sparkConf = new SparkConf
+ if (sparkConf.contains("spark.yarn.principal") &&
sparkConf.contains("spark.yarn.keytab")) {
+ UserGroupInformation.loginUserFromKeytab(
--- End diff --
before calling this, actually verify that the keytab file exists and fail
with a message including the property name, to help people debug the problem.
UGI internal exceptions are rarely informative enough
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