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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4167) Add support for restoring/rolling back to a snapshot
Date Mon, 19 May 2014 03:36:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14001360#comment-14001360

Tsz Wo Nicholas Sze commented on HDFS-4167:

> ... If the directory /foo/bar was deleted after snapshot s1, and then a user wants to
restore /foo/.snapshot/s1/bar/file, it is hard to determine where we should put the file.

The file should be restored to the original location, i.e. its location before taking snapshot

> ... Also the filesystem API must be defined as you suggested in the jira. However, the
relative path may seem confusing since users usually use relative path against the working
directory of the file system.

Then we may use the snapshot path as the parameter e.g. fs.restoreSnapshot(/foo/.snapshot/s0/bar).

> Add support for restoring/rolling back to a snapshot
> ----------------------------------------------------
>                 Key: HDFS-4167
>                 URL: https://issues.apache.org/jira/browse/HDFS-4167
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Suresh Srinivas
>            Assignee: Jing Zhao
>         Attachments: HDFS-4167.000.patch, HDFS-4167.001.patch, HDFS-4167.002.patch, HDFS-4167.003.patch,
> This jira tracks work related to restoring a directory/file to a snapshot.

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