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From "Richard Theige (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5444) Add atomic move option
Date Mon, 09 Mar 2009 22:23:50 GMT
Add atomic move option
----------------------

                 Key: HADOOP-5444
                 URL: https://issues.apache.org/jira/browse/HADOOP-5444
             Project: Hadoop Core
          Issue Type: New Feature
          Components: tools/distcp
    Affects Versions: 0.18.3
            Reporter: Richard Theige


Provide support for update to move directories/files atomically by copying the src directory
to a tmp directory (with random/unique name) then move the directory to its target destination
name after all subdirs/files are copied and verified.

example option ideas
  hadoop ... distcp -update -move src dst
or
  hadoop ... distcp -update -atomic src dst

to assure file correctness at the destination, before distcp performs the  'move' at the end
of the copy process, it should first perform a strong signature/cksum (e.g. MD4) on the files.

The issue/need for this is that applications may attempt to start processing data (because
files are present), prior to completion of a whole directory copy -- resulting in work against
an incomplete data set.

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