sweisdb commented on code in PR #45425:
URL: https://github.com/apache/spark/pull/45425#discussion_r1546872088


##########
common/network-common/src/main/java/org/apache/spark/network/crypto/README.md:
##########
@@ -1,6 +1,20 @@
-Forward Secure Auth Protocol
+Forward Secure Auth Protocol v1.1
 ==============================================
 
+Deprecation Notice
+------------------
+This is a bespoke key exchange protocol that was implemented before Spark 
supported TLS (aka SSL) for RPC
+calls. It is recommended that Spark users upgrade to using TLS for RPC calls 
between Spark processes. This protocol
+will be deprecated and removed in the long-term.

Review Comment:
   Fixing this.



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