srowen commented on a change in pull request #31059:
URL: https://github.com/apache/spark/pull/31059#discussion_r552677651



##########
File path: docs/tuning.md
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@@ -50,7 +50,7 @@ in your operations) and performance. It provides two 
serialization libraries:
   Java serialization is flexible but often quite slow, and leads to large
   serialized formats for many classes.
 * [Kryo serialization](https://github.com/EsotericSoftware/kryo): Spark can 
also use
-  the Kryo library (version 4) to serialize objects more quickly. Kryo is 
significantly
+  the Kryo library (version 5) to serialize objects more quickly. Kryo is 
significantly

Review comment:
       This is fine; we can also just delete the version reference here.




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