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https://issues.apache.org/jira/browse/HADOOP-6162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12732972#action_12732972
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Chris Douglas commented on HADOOP-6162:
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On second thought, this issue should be in common; the MapFileOutputFormat
changes can be moved to a MR issue.
> MapFile doesn't work with serializables other than Writables
> ------------------------------------------------------------
>
> Key: HADOOP-6162
> URL: https://issues.apache.org/jira/browse/HADOOP-6162
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Justin Patterson
> Attachments: HADOOP-6129.patch
>
>
> Since 0.18 (I think), SequenceFiles have supported serializing arbitrary
> objects through the serialization framework. MapFiles still don't. They
> require WritableComparable keys and Writable values.
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