Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/7394#discussion_r34800237
--- Diff:
yarn/src/main/scala/org/apache/spark/scheduler/cluster/YarnClientSchedulerBackend.scala
---
@@ -61,6 +60,12 @@ private[spark] class YarnClientSchedulerBackend(
// to the executors
super.start()
+ // SPARK-8851: In yarn-client mode, the AM still does the credentials
refresh. The driver
+ // reads the credentials from HDFS, just like the executors and
updates its own credentials
+ // cache.
+ if (conf.contains("spark.yarn.credentials.file")) {
+ YarnSparkHadoopUtil.get.startExecutorDelegationTokenRenewer(conf)
+ }
waitForApplication()
--- End diff --
it might make sense to move the startExecutorDelegationTokenRenewer til
after waitforApplication since it won't update the credentials until
application master is running anyway
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