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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4758) Disallow nested snapshottable directories
Date Thu, 25 Apr 2013 22:48:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642328#comment-13642328
] 

Jing Zhao commented on HDFS-4758:
---------------------------------

bq. it might result in issues where a user has taken a snapshot of /user/foo/dir1 and admin
finds that system-wide snaps cannot be taken at say /user dir levels since there are several
users with their snapshots at lower directories.

This may not be an issue because only admin can allow snapshot on a directory (i.e., to convert
a directory to a snapshottable directory). The admin can specify a set of snapshottable directories
in the beginning under which no more snapshottable directory will be allowed in the future.
                
> 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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