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https://issues.apache.org/jira/browse/SPARK-2878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14088678#comment-14088678
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Soren Macbeth commented on SPARK-2878:
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Great find!
This has definitely bitten me. I found a lame workround, but It would be
fantastic to have this well and truly fixed. Flambo needs kryo to function (not
to mention that kryo is much faster than java serialization almost all the
time).
> 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
>
> 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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