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From "Graham Dennis (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-2878) Inconsistent Kryo serialisation with custom Kryo Registrator
Date Wed, 06 Aug 2014 09:59:12 GMT

     [ https://issues.apache.org/jira/browse/SPARK-2878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Graham Dennis updated SPARK-2878:
---------------------------------

    Affects Version/s: 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, 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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