Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/14065#discussion_r73417691
--- Diff: core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala
---
@@ -338,15 +312,15 @@ class SparkHadoopUtil extends Logging {
}
/**
- * Start a thread to periodically update the current user's credentials
with new delegation
- * tokens so that writes to HDFS do not fail.
+ * Start a thread to periodically update the current user's credentials
with new credentials so
+ * that access to security service do not fail.
--- End diff --
nit: s/security/secured; "does not fail"
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