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

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-18110?focusedWorklogId=719531&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-719531 ]

ASF GitHub Bot logged work on HADOOP-18110:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 02/Feb/22 17:43
            Start Date: 02/Feb/22 17:43
    Worklog Time Spent: 10m 
      Work Description: xinglin opened a new pull request #3956:
URL: https://github.com/apache/hadoop/pull/3956


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   ### Description of PR
   
   We modified getTrashRoot()/getTrashRoots() in ViewFileSystem to return a localized trash root that is within a mount point when CONFIG_VIEWFS_MOUNT_POINT_LOCAL_TRASH is set.
    
   ### How was this patch tested?
   
   mvn test -Dtest=TestView*
   
   Manually ran three newly added unit tests using intellij. 
   
   
   


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Issue Time Tracking
-------------------

            Worklog Id:     (was: 719531)
    Remaining Estimate: 0h
            Time Spent: 10m

> 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
>          Time Spent: 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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