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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5303) A symlink within a snapshot pointing to a target outside the snapshot root can cause the snapshot contents to appear to change.
Date Sat, 05 Oct 2013 00:40:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13786811#comment-13786811
] 

Colin Patrick McCabe commented on HDFS-5303:
--------------------------------------------

I don't think this is a problem.  Symlinks are just references to things, not the things themselves.

Every other snapshotting filesystem (btrfs, ZFS, etc) allows snapshots to contain symlinks
to paths outside the snapshot.  We currently do the same, and that should be fine.

> A symlink within a snapshot pointing to a target outside the snapshot root can cause
the snapshot contents to appear to change.
> -------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5303
>                 URL: https://issues.apache.org/jira/browse/HDFS-5303
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Chris Nauroth
>
> A snapshot is supposed to represent the point-in-time state of a directory.  However,
if the directory contains a symlink that targets a file outside the snapshot root, then the
snapshot contents will appear to change if someone changes the target file (i.e. delete or
append).



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