expunge is safe option. I do -rm -r and some times wanted to clean, run
expunge command.
On 11/4/16 12:17 PM, Lantao Jin (JIRA) wrote:
Lantao Jin shared an issue with you
-----------------------------------
Deleting .Trash without -skipTrash should be confirmed
------------------------------------------------------
Key: HDFS-11102
URL: https://issues.apache.org/jira/browse/HDFS-11102
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs
Reporter: Lantao Jin
As a Hadoop DEVOPS, I saw lots of cases that user delete their data by mistake.
Most of them can be recovered from trash but the rest ones were not luck.
A system can’t guess user's purpose，but a good system should help user to avoid
their mistakes.
There is a very common case like:
If a user want to delete some dir from HDFS, they may use:
{code}
hadoop -fs -rm -r /user/someone/pathToBeDelete
{code}
The directory /user/someone/pathToBeDelete will move into
{code}
/user/someone/.Trash/current/user/someone/pathToBeDelete
{code}
If user want delete it permanently, option "-skipTrash" can be attached. That's
the design and Hadoop knows the user's purpose well.
Usually, user didn't use "skipTrash" for safety consideration. That's good till
now.
But the purpose is to delete some data for saving more space. Then the user
begin to delete it from Trash with the below command:
{code}
hadoop -fs -rm -r /user/someone/ .Trash
{code}
Why not just delete "/user/someone/.Trash/current/user/someone/pathToBeDelete"
is that because the user knows only pathToBeDelete in trash directory now.
The trash include pathToBeDelete will be deleted permanently.
*But Wait! Do you see the blank space before the dot?*
If you also type this command by "copy-paste" include some space or invisible
char, the whole /user/someone directory and the whole /user/someone/.Trash will be
deleted unfortunately. *Jesus, that's means the directory /user/someone is deleted
permanently and unexpectedly!*
So I think *any ".Trash" word appears in the "rm" command without "skip" should
be launched a double checking by system to help people to avoid their mistake.*
If you also agree this design, I will offer a patch.
Also shared with
[email protected]
[email protected]
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