viirya commented on a change in pull request #31761:
URL: https://github.com/apache/spark/pull/31761#discussion_r590891367



##########
File path: core/src/main/scala/org/apache/spark/internal/config/package.scala
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@@ -691,6 +691,15 @@ package object config {
     .toSequence
     .createWithDefault(Nil)
 
+  private[spark] val KERBEROS_FILESYSTEM_RENEWAL_EXCLUDE =
+    ConfigBuilder("spark.kerberos.renewal.exclude.hadoopFileSystems")
+      .doc("The list of Hadoop filesystem URLs whose hosts will be excluded 
from " +

Review comment:
       From the user perspective, I think it is still possible they want to 
avoid renewal for defaultFs. If the defaultFs is just a remote HDFS that whose 
tokens cannot be renew from YARN?




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