Daryn Sharp created HADOOP-10014:
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Summary: 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: Bug
Components: fs
Affects Versions: 2.0.0-alpha, 3.0.0
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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