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https://issues.apache.org/jira/browse/SPARK-2878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Wendell resolved SPARK-2878.
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Resolution: Fixed
Fixed by SPARK-3046 via:
https://github.com/apache/spark/pull/1972
> Inconsistent Kryo serialisation with custom Kryo Registrator
> ------------------------------------------------------------
>
> Key: SPARK-2878
> URL: https://issues.apache.org/jira/browse/SPARK-2878
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.0.0, 1.0.2
> Environment: Linux RedHat EL 6, 4-node Spark cluster.
> Reporter: Graham Dennis
> Assignee: Graham Dennis
> Priority: Critical
>
> The custom Kryo Registrator (a class with the
> org.apache.spark.serializer.KryoRegistrator trait) is not used with every
> Kryo instance created, and this causes inconsistent serialisation and
> deserialisation.
> The Kryo Registrator is sometimes not used because of a ClassNotFound
> exception that only occurs if it *isn't* the Worker thread (of an Executor)
> that tries to create the KryoRegistrator.
> A complete description of the problem and a project reproducing the problem
> can be found at https://github.com/GrahamDennis/spark-kryo-serialisation
> I have currently only tested this with Spark 1.0.0, but will try to test
> against 1.0.2.
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