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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-689) hadoop should provide a common way to wrap instances with different types into one type
Date Tue, 28 Nov 2006 18:19:26 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-689?page=comments#action_12454060 ] 
            
Hadoop QA commented on HADOOP-689:
----------------------------------

+1, http://issues.apache.org/jira/secure/attachment/12345896/HADOOP-689.patch.new applied
and successfully tested against trunk revision 480142

> 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, HADOOP-689.patch.new
>
>
> 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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