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From "Stephen Chu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6620) Snapshot docs should specify about preserve options with cp command
Date Wed, 02 Jul 2014 18:21:28 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6620?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Stephen Chu updated HDFS-6620:

    Attachment: HDFS-6620.001.patch

Attaching a patch that

* changes the cp snapshot doc example to use the -ptopax option. I added a note that the example
shows how to preserve timestamp, ownership, permissions, acls, and xattrs.

* Added an additional XAttr + Snapshot unit test to verify that users can copy a snapshot
file and preserve its attributes.

> Snapshot docs should specify about preserve options with cp command
> -------------------------------------------------------------------
>                 Key: HDFS-6620
>                 URL: https://issues.apache.org/jira/browse/HDFS-6620
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 3.0.0, 2.5.0
>            Reporter: Uma Maheswara Rao G
>            Assignee: Stephen Chu
>         Attachments: HDFS-6620.001.patch
> Currently snapshot docs contains the cp command details for copying the snapshot files
to regular dfs tree.
> http://hadoop.apache.org/docs/r2.3.0/hadoop-project-dist/hadoop-hdfs/HdfsSnapshots.html#Snapshot_Paths
> Copying a file from snapshot s0:
> hdfs dfs -cp /foo/.snapshot/s0/bar /tmp
> Since there are important properties(acls, xattrs..etc) for a file may need to copy back.
But looking at this doc may mislead to copy with out using any options. So, It may be worth
mentioning aboit that properties. Infact it should copy all properties  by default from snapshot

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