Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4688#discussion_r25526105
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala ---
@@ -256,6 +256,12 @@ private[spark] class ApplicationMaster(
private def runDriver(securityMgr: SecurityManager): Unit = {
addAmIpFilter()
+
+ // This must be done before SparkContext is initialized, since the
CoarseGrainedSchedulerBackend
+ // is started at that time. That is what schedules the re-logins. It
is scheduled only if the
+ // principal is actually setup. So we make sure it is available.
+ SparkHadoopUtil.get.setPrincipalAndKeytabForLogin(
+ System.getenv("SPARK_PRINCIPAL"), System.getenv("SPARK_KEYTAB"))
--- End diff --
Oh, but `SPARK_YARN_STAGING_DIR` is used internally, it's not
user-configurable. It seems like these two options are user-configurable,
right? If they're not, env variables are probably fine.
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