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https://issues.apache.org/jira/browse/SPARK-2421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15148776#comment-15148776
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Sean Owen commented on SPARK-2421:
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Pretty much the same reason in all cases: no activity in 16 months, a
nice-to-have (i.e. not a known bug), nobody asking for it or putting any work
into or reason to expect activity. It's more fruitful to reflect reality -- and
then if desired ask, why is nobody (like yourself) working on it if you are
interested?
Or: reopen it but please, only if there is a good-faith reason to expect
someone will work on it imminently. Remember, things can be reopened later.
Worst case, new issues can be opened. We can also make a different resolution
like "Later" if people find that softer.
> 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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