gaborgsomogyi commented on a change in pull request #23348: [SPARK-25857][core] 
Add developer documentation regarding delegation tokens.
URL: https://github.com/apache/spark/pull/23348#discussion_r245320048
 
 

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 File path: core/src/main/scala/org/apache/spark/deploy/security/README.md
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+# Delegation Token Handling In Spark
+
+This document aims to explain and demistify delegation tokens as they are used 
by Spark, since
+this topic is generally a huge source of confusion.
+
+
+## What are delegation tokens?
+
+Delegation tokens (DTs from now on) are authentication tokens used by some 
services to replace
+Kerberos service tokens. Many services in the Hadoop ecosystem have support 
for DTs, since they
 
 Review comment:
   The point here not the list but the fact there are services [which are] + 
[which aren't] in the Hadoop ecosystem. It's a minor thing so no strong opinion.

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