[ http://issues.apache.org/jira/browse/HADOOP-839?page=all ]
Doug Cutting updated HADOOP-839:
--------------------------------
Summary: Improvements to GenericWritable (was: CLONE -hadoop should
provide a common way to wrap instances with different types into one type)
Description: GenericWritable has a few easily addressed problems. (was:
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.)
> Improvements to GenericWritable
> -------------------------------
>
> Key: HADOOP-839
> URL: http://issues.apache.org/jira/browse/HADOOP-839
> Project: Hadoop
> Issue Type: Improvement
> Components: io
> Environment: All environment
> Reporter: Feng Jiang
> Fix For: 0.9.0
>
> Attachments: patch.839.r488924
>
>
> GenericWritable has a few easily addressed problems.
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