GuoPhilipse commented on PR #4602:
URL: https://github.com/apache/hadoop/pull/4602#issuecomment-1322966990
> Did you test it? This behavior is consistent with the local file system.
Thanks for your review @tomscut , actually `chown ` command can be used for
change owner or group belong info.
i used chown to change the file group ,keeping the owner as the before.
maybe we can make it clearer ,if we use `chown` to change owner ,super user
is a must, if we use `chown` to change the group ,then user either may be the
owner of the files or the super user.
reproduce steps as the following
step1 :create new group
`groupadd philipse1`
step2:add user to the group
`useradd philipse -g philipse1`
step3: touch a file(any user)
hdfs dfs -touch /tmp/test2/test3
step4:use super user(hadoop is the super user) to change the owner and group
of the file to philipse
hdfs dfs -chown philipse:philipse /tmp/test2/test3
now we get the file info as the following:
`-rw-r--r-- 3 philipse philipse 0 2022-11-22 10:53
/tmp/test2/test3`
step5:use owner philipse to change new owner, there will be error,for
philipse is not the super user
`
hdfs dfs -chown root:philipse /tmp/test2/test3
chown: changing ownership of '/tmp/test2/test3': User philipse is not a
super user (non-super user cannot change owner).`
step6:use owner philipse to change new group, the command will be ok.
`hdfs dfs -chown philipse:philipse1 /tmp/test2/test3`
let's see the result,the group has been modifyed by `chown` command.
`
hdfs dfs -ls /tmp/test2/test3
-rw-r--r-- 3 philipse philipse1 0 2022-11-22 10:53
/tmp/test2/test3
`
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