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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-14086) Improve DistCp Speed for small files
Date Wed, 15 Feb 2017 21:55:41 GMT
Zheng Shao created HADOOP-14086:
-----------------------------------

             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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