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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4758) Disallow nested snapshottable directories
Date Thu, 25 Apr 2013 22:08:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642280#comment-13642280
] 

Suresh Srinivas commented on HDFS-4758:
---------------------------------------

The current branch does support nested snapshots. The reason why this is being proposed is
to provide limited functionality early on and if that suffices remove complexity associated
with supporting and testing nested snapshots at arbitrary levels. If we support nested snapshots
now, it will not be possible to take it away in the future. In my discussion with Jing and
Nicholas we had considered the following:
# Allow snapshot of / as a special case and that is the only snapshottable directory with
in which another snapshottable directory is allowed.
# Disallow nested snapshots in the first phase. See how how this is used by the users and
enable it either as stated in the first bullet or remove the restriction altogether.

If the current restrictions takes away some use cases, so be it. Lets turn it back on later
if we cannot live without it.


                
> Disallow nested snapshottable directories
> -----------------------------------------
>
>                 Key: HDFS-4758
>                 URL: https://issues.apache.org/jira/browse/HDFS-4758
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>
> Nested snapshottable directories are supported by the current implementation.  However,
it seems that there are no good use cases for nested snapshottable directories.  So we disable
it for now until someone has a valid use case for it.

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