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Posted to common-issues@hadoop.apache.org by "Zheng Shao (JIRA)" <ji...@apache.org> on 2017/02/15 21:55:41 UTC

[jira] [Created] (HADOOP-14086) Improve DistCp Speed for small files

Zheng Shao created HADOOP-14086:
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             Summary: Improve DistCp Speed for small files
                 Key: HADOOP-14086
                 URL: https://issues.apache.org/jira/browse/HADOOP-14086
             Project: Hadoop Common
          Issue Type: Improvement
          Components: tools/distcp
    Affects Versions: 2.6.5
            Reporter: Zheng Shao
            Assignee: Zheng Shao
            Priority: Minor


When using distcp to copy lots of small files,  NameNode naturally becomes a bottleneck.

The current distcp code did *not* optimize to reduce the NameNode calls.  We should restructure the code to reduce the number of NameNode calls as much as possible to speed up the copy of small files.




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