Xing Lin created HADOOP-18110:
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Summary: ViewFileSystem: Add Support for Localized Trash Root
Key: HADOOP-18110
URL: https://issues.apache.org/jira/browse/HADOOP-18110
Project: Hadoop Common
Issue Type: Improvement
Components: common
Reporter: Xing Lin
getTrashRoot() in ViewFileSystem calls getTrashRoot() from underlying
filesystem, to return the trash root. Most of the time, we get a trash root in
user home dir. This can lead to problems when an application wants to delete a
file in a mounted point using moveToTrash() in TrashPolicyDefault, because we
can not rename across multiple filesystems/hdfs namenodes.
We propose the following extension to getTrashRoot/getTrashRoots in
ViewFileSystem: add a flag to return a localized trash root for ViewFileSystem.
A localized trash root is a trash root which starts from the root of a mount
point (e.g., /mountpointRoot/.Trash/\{user}).
* If CONFIG_VIEWFS_MOUNT_POINT_LOCAL_TRASH is not set to true, or
* when the path p is in a snapshot or an encryption zone, return
* the default trash root in user home dir.
*
* when CONFIG_VIEWFS_MOUNT_POINT_LOCAL_TRASH is set to true,
* 1) if path p is mounted from the same targetFS as user home dir,
* return a trash root in user home dir.
* 2) else, return a trash root in the mounted targetFS
*
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