Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/4688#discussion_r29286856
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala ---
@@ -271,6 +283,9 @@ private[spark] class ApplicationMaster(
rpcEnv = RpcEnv.create("sparkYarnAM", Utils.localHostName, 0,
sparkConf, securityMgr)
waitForSparkDriver()
addAmIpFilter()
+ // If a principal and keytab have been set, use that to create new
credentials for executors
+ // periodically
+ delegationTokenRenewerOption.foreach(_.scheduleLoginFromKeytab())
--- End diff --
is this one needed? We call this above already in run() if credentials
file present
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