[jira] [Created] (HADOOP-18110) ViewFileSystem: Add Support for Localized Trash Root

["Xing Lin (Jira)" <ji...@apache.org>]

Xing Lin created HADOOP-18110:
---------------------------------

             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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