Github user mridulm commented on a diff in the pull request: https://github.com/apache/spark/pull/16788#discussion_r105319198 --- Diff: core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala --- @@ -151,9 +152,13 @@ object SparkSubmit extends CommandLineUtils { val (childArgs, childClasspath, sysProps, childMainClass) = prepareSubmitEnvironment(args) def doRunMain(): Unit = { + if (args.principal != null && args.keytab!= null) { + KerberosUser.securize(args.principal, args.keytab) --- End diff -- This will cause multiple UGI.loginUserFromKeytab (in yarn case it happens in SparkSubmit.prepareSubmitEnvironment) - which causes various issues. In an application, there must be only one call to UGI.loginUserFromKeytab; if more than one, random things fail (dfs client, metastore, etc) due to the way the loginUser is cached/used and hadoop ipc renews unfortunately.
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