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https://issues.apache.org/jira/browse/SPARK-34658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17299225#comment-17299225
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Hyukjin Kwon commented on SPARK-34658:
--------------------------------------

For mailing list, please take a look here: 
https://spark.apache.org/community.html
Sure, let's see how it gose :-)

> Kryo serializer not working with Spark SQL module
> -------------------------------------------------
>
>                 Key: SPARK-34658
>                 URL: https://issues.apache.org/jira/browse/SPARK-34658
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.0.1, 3.0.2, 3.1.1
>            Reporter: Nafis Sadat
>            Priority: Minor
>
> Hey all,
> I apologize if this has already been explored, but I keep getting this error 
> whenever I have the Kryo registration required in my Spark app. The error is 
> below; I have tried many a different types of combination to register this 
> class but I just can't get anything to work, and so any help will be highly 
> appreciated!
>  
> {code:java}
> Caused by: com.esotericsoftware.kryo.KryoException: 
> java.lang.IllegalArgumentException: Class is not registered: 
> org.apache.spark.sql.execution.datasources.InMemoryFileIndex$Seriali
> zableBlockLocation[]
> Note: To register this class use: 
> kryo.register(org.apache.spark.sql.execution.datasources.InMemoryFileIndex$SerializableBlockLocation[].class);
> Serialization trace:
> blockLocations 
> (org.apache.spark.sql.execution.datasources.InMemoryFileIndex$SerializableFileStatus)
> array (scala.collection.mutable.ArrayBuffer)
> {code}
>  
> I've tried all kinds of things to get these classes to be registered, but 
> it's just not working for me..



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