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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