[jira] Commented: (HADOOP-957) Map/Reduce job with SequenceFileOutputFormat should be able to add user specified metadata to the output file

["Doug Cutting (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12468448 ] 

Doug Cutting commented on HADOOP-957:
-------------------------------------

Could this be done as a subclass of SequenceFileOutputFormat, RecordOutputFormat?

> Map/Reduce job with SequenceFileOutputFormat should be able to add user specified metadata to the output file
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-957
>                 URL: https://issues.apache.org/jira/browse/HADOOP-957
>             Project: Hadoop
>          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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