[ http://issues.apache.org/jira/browse/HADOOP-689?page=all ]
Doug Cutting updated HADOOP-689:
--------------------------------
Status: Patch Available (was: Open)
> hadoop should provide a common way to wrap instances with different types
> into one type
> ---------------------------------------------------------------------------------------
>
> Key: HADOOP-689
> URL: http://issues.apache.org/jira/browse/HADOOP-689
> Project: Hadoop
> Issue Type: Improvement
> Components: io
> Environment: All environment
> Reporter: Feng Jiang
> Attachments: HADOOP-689.patch
>
>
> When two sequence files, which have same Key type but different Value types,
> are mapped out to reduce, multiple Value types is not allowed. In this case,
> we need a way to wrap instances with different types into one class type to
> reduce.
> In current code, ObjectWritable is a sole choice. but it costs too many
> space, because the class declaration will be appended into output file as a
> string for every Key-value pair.
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