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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10014) Symlink resolution is fundamentally broken for multi-layered filesystems
Date Thu, 12 May 2016 22:27:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15282178#comment-15282178

Sangjin Lee commented on HADOOP-10014:

There has been no movement on this for a while. We'll need to move it out of scope for 2.8.0
soon. Let me know if you disagree.

> Symlink resolution is fundamentally broken for multi-layered filesystems
> ------------------------------------------------------------------------
>                 Key: HADOOP-10014
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10014
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs
>    Affects Versions: 2.0.0-alpha, 3.0.0-alpha1
>            Reporter: Daryn Sharp
>            Priority: Critical
> Symlink resolution is performed on a per-filesystem basis.  In a multi-layered filesystem,
the symlinks need to be resolved relative to the highest level filesystem in the stack.  Otherwise,
fs implementations like viewfs and chroot fs behave incorrectly.  Absolute symlinks may violate
the base of the chroot.  Links that should have crossed viewfs mount points are again incorrectly
resolved relative to the base filesystem.
> Symlink resolution has occur above the level of any individual fs to allow a multi-layered
fs stack to work correctly, such as via a symlink-aware {{FilteredFileSystem}} that wraps
any arbitrary fs to ensure links are resolved from the top-down of the stack.

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