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https://issues.apache.org/jira/browse/HADOOP-2834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12580422#action_12580422
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Andrzej Bialecki commented on HADOOP-2834:
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I'm working on an updated patch, and I just realized that we can only iterate
over entries (using RawKeyValueIterator), and we can't support some other
methods in the Reader abstraction, methods that are available in other readers
such as seek ... We can only implement next(), get(), reset() and close(). If
people feel that this still falls under the Reader rather than Iterator I'll
complete the patch that implements it.
> 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
> Assignee: 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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