Hi Enrico,

Only set spark.kryo.registrationRequired if you want to forbid any classes you have not explicitly registered - see http://spark.apache.org/docs/latest/configuration.html

Spark Configuration. Spark Properties. Dynamically Loading Spark Properties; Viewing Spark Properties; Available Properties. Application Properties; Runtime Environment
To enable kryo, you just need spark.serializer=org.apache.spark.serializer.KryoSerializer. There is some info here - http://spark.apache.org/docs/latest/tuning.html


From: Enrico DUrso <enrico.durso@everis.com>
Sent: 10 January 2017 11:10
To: user@spark.apache.org
Subject: Kryo On Spark 1.6.0


I am trying to use Kryo on Spark 1.6.0.
I am able to register my own classes and it works, but when I set “spark.kryo.registrationRequired “ to true, I get an error about a scala class:
“Class is not registered: scala.collection.mutable.WrappedArray$ofRef”.

Any of you has already solved this issue in Java? I found the code to solve it in Scala, but unable to register this class in Java.



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