[jira] [Commented] (SPARK-2878) Inconsistent Kryo serialisation with custom Kryo Registrator

["Graham Dennis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-2878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14087424#comment-14087424 ] 

Graham Dennis commented on SPARK-2878:
--------------------------------------

I've now reproduced this with Spark 1.0.2

> 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
>         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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