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https://issues.apache.org/jira/browse/HADOOP-11561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14310688#comment-14310688
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Jens Rabe commented on HADOOP-11561:
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I posted this in the wrong category, as MapReduce already has a
CompositeInputFormat which does exactly this task. With my feature request I
wanted to address client functionality.
> It should be possible to chain-load multiple MapFiles on the fly and read the
> records in an ascending order
> -----------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-11561
> URL: https://issues.apache.org/jira/browse/HADOOP-11561
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Jens Rabe
> Priority: Minor
> Labels: mapfile
> Original Estimate: 96h
> Remaining Estimate: 96h
>
> In a scenario where there are many MapFiles which all share the same
> key/value types, e.g., when dealing with measured data from sensors, it
> should be possible to chain-load multiple MapFiles. That means, there should
> be a reader which can be supplied with one or more directories containing
> MapFiles, and it should be possible to read the records of all files in order.
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