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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2834) Iterator for MapFileOutputFormat
Date Thu, 14 Feb 2008 21:17:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12569092#action_12569092
] 

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

Instead of creating a new ByteArrayInputStream and DataInputStream per key and value, why
not re-use a single DataInputBuffer, cached as a field in the iterator?

> 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.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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