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https://issues.apache.org/jira/browse/MAPREDUCE-815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12790947#action_12790947
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Jacob Rideout commented on MAPREDUCE-815:
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> only one of key and value will be useful and the other will be null.
Thanks Doug, that makes sense.

What about the AvroOutputFormat? Does the same condition apply? I can see 
ignoring keys for the output of the reducer, but what about the output of a map?

> Add AvroInputFormat and AvroOutputFormat so that hadoop can use Avro 
> Serialization
> ----------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-815
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-815
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>            Reporter: Ravi Gummadi
>            Assignee: Ravi Gummadi
>
> MapReduce needs AvroInputFormat similar to other InputFormats like 
> TextInputFormat to be able to use avro serialization in hadoop. Similarly 
> AvroOutputFormat is needed.

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