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From "Harsh J (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-218) Map/Reduce job with SequenceFileOutputFormat should be able to add user specified metadata to the output file
Date Mon, 16 Jan 2012 10:40:40 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harsh J resolved MAPREDUCE-218.
-------------------------------

    Resolution: Won't Fix

Users may override/extend the SFOF if they want to utilize SequenceFile.Writer's new metadata
methods/features.
                
> Map/Reduce job with SequenceFileOutputFormat should be able to add user specified metadata
to the output file
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-218
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-218
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>            Reporter: Runping Qi
>
> When creating a map/reduce job with SequenceFileFormat, 
> the user would like to add some metada to the output files automatically. 
> In particular, if the output value class was a JuteRecord class generated from a Jute
IDL, 
> we would like to add JUTE_IDL/IDL_STRING as a attribute/value pair of the metadata.
> This way, the output files will be self describing: 
> When an application that tries to use the files may not have the value class with it.

> But the application can use Jute tool to generate the classes on demand.
> Or better yet, the SequenceFile record reader may be able to do that automatically.

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