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From "Andrzej Bialecki (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2834) Iterator for MapFileOutputFormat
Date Mon, 10 Mar 2008 23:22:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12577244#action_12577244
] 

Andrzej Bialecki  commented on HADOOP-2834:
-------------------------------------------

The implementation in the latest patch doesn't create new Entries, it reuses a single instance.
Though I agree that considering your doubt, and the already existing MapFile.Reader API, it
would be more intuitive to create a MapFileOutputFormat.Reader, as Enis suggested.

I'll prepare an updated patch.

> Iterator for MapFileOutputFormat
> --------------------------------
>
>                 Key: HADOOP-2834
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2834
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.17.0
>            Reporter: Andrzej Bialecki 
>             Fix For: 0.17.0
>
>         Attachments: map-file-v2.patch, map-file-v3.patch
>
>
> MapFileOutputFormat produces output data that is sorted locally in each part-NNNNN file
- however, there is no easy way to iterate over keys from all parts in a globally ascending
order.

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