Github user harishreedharan commented on a diff in the pull request:
https://github.com/apache/spark/pull/5823#discussion_r29487432
--- Diff:
core/src/main/scala/org/apache/spark/executor/CoarseGrainedExecutorBackend.scala
---
@@ -168,6 +170,26 @@ private[spark] object CoarseGrainedExecutorBackend
extends Logging {
driverConf.set(key, value)
}
}
+ // Delegation Token Updater is not supported in Hadoop 1, so use
reflection.
+ // Can't use Option[ExecutorDelegationTokenUpdater] because it is
built only in YARN
+ // profile, so use Option[Any] since even the stop method call will
be via reflection.
+ var tokenUpdaterOption: Option[Any] = None
+ var tokenUpdaterClass: Option[Class[_]] = None
--- End diff --
I didn't want to add more methods to `SparkHadoopUtil` and
`YarnSparkHadoopUtil`, but since that gets rid of the reflection and also
guarantees that `addCredentials` gets called only in YARN mode, I guess it is
worth it.
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