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https://issues.apache.org/jira/browse/HADOOP-13975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zheng Shao updated HADOOP-13975:
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Status: Open (was: Patch Available)
> Allow DistCp to use MultiThreadedMapper
> ---------------------------------------
>
> Key: HADOOP-13975
> URL: https://issues.apache.org/jira/browse/HADOOP-13975
> Project: Hadoop Common
> Issue Type: New Feature
> Components: tools/distcp
> Affects Versions: 3.0.0-alpha1
> Reporter: Zheng Shao
> Assignee: Zheng Shao
> Priority: Minor
> Attachments: HADOOP-distcp-multithreaded-mapper-branch26.1.patch,
> HADOOP-distcp-multithreaded-mapper-branch26.2.patch,
> HADOOP-distcp-multithreaded-mapper-branch26.3.patch,
> HADOOP-distcp-multithreaded-mapper-trunk.1.patch,
> HADOOP-distcp-multithreaded-mapper-trunk.2.patch,
> HADOOP-distcp-multithreaded-mapper-trunk.3.patch
>
>
> Although distcp allow users to control the parallelism via number of mappers,
> sometimes it's desirable to run fewer mappers but more threads per mapper.
> Since distcp is network bound (either by throughput or more frequently by
> latency of creating connections, opening files, reading/writing files, and
> closing files), this can make each mapper much more efficient.
> In that way, a lot of resources can be shared so we can save memory and
> connections to NameNode.
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