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https://issues.apache.org/jira/browse/HADOOP-18110?focusedWorklogId=727970&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-727970
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ASF GitHub Bot logged work on HADOOP-18110:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 16/Feb/22 00:55
Start Date: 16/Feb/22 00:55
Worklog Time Spent: 10m
Work Description: xinglin opened a new pull request #3994:
URL: https://github.com/apache/hadoop/pull/3994
Fixes #3956
(cherry picked from commit ca8ba24051b7fca4612c9c182cb49f5183ce33ba)
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### Description of PR
Cherry-pick the patch from trunk to branch-2.10, with a few other changes,
to make it work for branch-2.10.
### How was this patch tested?
Manually run the new test cases from Intellij.
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Issue Time Tracking
-------------------
Worklog Id: (was: 727970)
Time Spent: 3h 10m (was: 3h)
> 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
> Assignee: Xing Lin
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> 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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