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https://issues.apache.org/jira/browse/MAPREDUCE-5069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13603476#comment-13603476
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Robert Joseph Evans commented on MAPREDUCE-5069:
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+1 on the idea too.
> add concrete common implementations of CombineFileInputFormat
> -------------------------------------------------------------
>
> Key: MAPREDUCE-5069
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5069
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv1, mrv2
> Affects Versions: 2.0.3-alpha
> Reporter: Sangjin Lee
> Priority: Minor
>
> CombineFileInputFormat is abstract, and its specific equivalents to
> TextInputFormat, SequenceFileInputFormat, etc. are currently not in the
> hadoop code base.
> These sound like very common need wherever CombineFileInputFormat is used,
> and different folks would write the same code over and over to achieve the
> same goal. It sounds very natural for hadoop to provide at least the text and
> sequence file implementations of the CombineFileInputFormat class.
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