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https://issues.apache.org/jira/browse/SPARK-2421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14056677#comment-14056677
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Xuefu Zhang commented on SPARK-2421:
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CC [~rxin], [~hshreedharan]
> Spark should treat writable as serializable for keys
> ----------------------------------------------------
>
> Key: SPARK-2421
> URL: https://issues.apache.org/jira/browse/SPARK-2421
> Project: Spark
> Issue Type: Improvement
> Components: Input/Output, Java API
> Affects Versions: 1.0.0
> Reporter: Xuefu Zhang
>
> It seems that Spark requires the key be serializable (class implement
> Serializable interface). In Hadoop world, Writable interface is used for the
> same purpose. A lot of existing classes, while writable, are not considered
> by Spark as Serializable. It would be nice if Spark can treate Writable as
> serializable and automatically serialize and de-serialize these classes using
> writable interface.
> This is identified in HIVE-7279, but its benefits are seen global.
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