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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
