Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/14065#discussion_r71107536
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/security/AMDelegationTokenRenewer.scala
---
@@ -69,6 +71,9 @@ private[yarn] class AMDelegationTokenRenewer(
private val freshHadoopConf =
hadoopUtil.getConfBypassingFSCache(hadoopConf, new
Path(credentialsFile).toUri.getScheme)
+ @volatile private var timeOfNextRenewal =
+ sparkConf.get(CREDENTIALS_RENEWAL_TIME).getOrElse(Long.MaxValue)
--- End diff --
One possible scenario from current code is that if principal and keytab is
configured, but all credential are non-renewable or disabled. In such case
`CREDENTIALS_RENEWAL_TIME` may be empty but `AMDelegationTokenRenewer` will
still be started because it only relies on principal configured or not.
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