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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2834) Iterator for MapFileOutputFormat
Date Mon, 10 Mar 2008 23:06:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12577242#action_12577242
] 

Doug Cutting commented on HADOOP-2834:
--------------------------------------

Would this return a new Entry per key/value pair?  Would these each contain new key/value
instances?  The existing API encourages object reuse, which can provide substantial performance
improvements.  Do we want to encourage developers to develop suboptimal code?

> 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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