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https://issues.apache.org/jira/browse/SPARK-21569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16106054#comment-16106054
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Sean Owen commented on SPARK-21569:
-----------------------------------
Inline your repro here please; it's simple and makes this self-contained.
I suspect that class isn't supposed to be part of anything that's serialized,
in which case the change isn't to register it but figure out why something is
writing this.
> Internal Spark class needs to be kryo-registered
> ------------------------------------------------
>
> Key: SPARK-21569
> URL: https://issues.apache.org/jira/browse/SPARK-21569
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.2.0
> Reporter: Ryan Williams
>
> [Full repro here|https://github.com/ryan-williams/spark-bugs/tree/hf]
> As of 2.2.0, {{saveAsNewAPIHadoopFile}} jobs fail (when
> {{spark.kryo.registrationRequired=true}}) with:
> {code}
> java.lang.IllegalArgumentException: Class is not registered:
> org.apache.spark.internal.io.FileCommitProtocol$TaskCommitMessage
> Note: To register this class use:
> kryo.register(org.apache.spark.internal.io.FileCommitProtocol$TaskCommitMessage.class);
> at com.esotericsoftware.kryo.Kryo.getRegistration(Kryo.java:458)
> at
> com.esotericsoftware.kryo.util.DefaultClassResolver.writeClass(DefaultClassResolver.java:79)
> at com.esotericsoftware.kryo.Kryo.writeClass(Kryo.java:488)
> at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:593)
> at
> org.apache.spark.serializer.KryoSerializerInstance.serialize(KryoSerializer.scala:315)
> at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:383)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> This internal Spark class should be kryo-registered by Spark by default.
> This was not a problem in 2.1.1.
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