Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/14065#discussion_r71046990
--- 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 --
From my understanding you should never get to this code when
`CREDENTIALS_RENEWAL_TIME` is not set, so you should use `.get` to force and
exception in case the config is not set.
If indeed that situation can occur and you really need a default value, it
should be declared in the constant itself and not here where it's used.
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