[
https://issues.apache.org/jira/browse/HADOOP-5444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720520#action_12720520
]
Hong Tang commented on HADOOP-5444:
-----------------------------------
Would the program litter partially copied directories if the command fails or
interrupted by the client?
> 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
> Attachments: d_retries_atomic.patch
>
>
> 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.
