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https://issues.apache.org/jira/browse/MAPREDUCE-5287?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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nicu marasoiu reassigned MAPREDUCE-5287:
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Assignee: nicu marasoiu (was: Owen O'Malley)
> Create a generic InputFormat wrapping any other InputFormat, to control the
> number of map tasks
> -----------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5287
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5287
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv1, performance
> Reporter: nicu marasoiu
> Assignee: nicu marasoiu
> Priority: Minor
> Original Estimate: 4h
> Remaining Estimate: 4h
>
> I wrote a generic InputFormat that wraps any other InputFormat, and creates
> CompositeInputSplits to reduce the number of map tasks in a controllable
> manner while preserving data locality. A correspondent CompositeRecordReader
> is written to iterate through underlying RecordReaders as created by the
> underlying InputFormat for each underlying raw split.
> An application to this is to group TableSplits when the raw splits are coming
> from multiple regions and are filtered with key ranges. We use this to
> shard/distribute a time based incremental access to an hbase table.
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