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Posted to common-issues@hadoop.apache.org by "Zheng Shao (JIRA)" <ji...@apache.org> on 2010/03/25 21:05:27 UTC

[jira] Commented: (HADOOP-6660) add Writable wrapper for Avro data

    [ https://issues.apache.org/jira/browse/HADOOP-6660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12849876#action_12849876 ] 

Zheng Shao commented on HADOOP-6660:
------------------------------------

How does the Writable class get the metadata (like type information)?
Are we going to serialize metadata with data for each key(or value)? That will be a loss of efficiency.



> add Writable wrapper for Avro data
> ----------------------------------
>
>                 Key: HADOOP-6660
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6660
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: io
>            Reporter: Doug Cutting
>             Fix For: 0.22.0
>
>
> To permit passing Avro data through MapReduce we can add a wrapper class that implements Writable.

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