Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21466#discussion_r192034668
--- Diff:
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/security/YARNHadoopDelegationTokenManager.scala
---
@@ -44,6 +44,10 @@ private[yarn] class YARNHadoopDelegationTokenManager(
// public for testing
val credentialProviders = getCredentialProviders
+ if (credentialProviders.keys.nonEmpty) {
--- End diff --
Yup.
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