Siyao Meng commented on HDDS-2665:

Hi [~Sammi], as of the current impl in HDDS-2929, in order to use the temp 
mount, first an admin need to create the temp VOLUME during cluster setup. This 
only need to be done once:
ozone sh volume create tmp
ozone sh volume setacl tmp -al world::a
The volume name {{tmp}} is hard-coded at the moment.

Then each new user shall run the following once to initialize their temp BUCKET:
ozone fs -mkdir ofs://om/tmp/
This will create a bucket inside the above temp volume for that user.
Now {{ofs://om/tmp/}} is a mount of volume {{tmp}} and bucket 
{{md5(username)}}. The user can use {{ofs://om/tmp/}} as they would normally do.

> Implement new Ozone Filesystem scheme ofs://
> --------------------------------------------
>                 Key: HDDS-2665
>                 URL: https://issues.apache.org/jira/browse/HDDS-2665
>             Project: Hadoop Distributed Data Store
>          Issue Type: New Feature
>            Reporter: Siyao Meng
>            Assignee: Siyao Meng
>            Priority: Major
>         Attachments: Design ofs v1.pdf
>          Time Spent: 40m
>  Remaining Estimate: 0h
> Implement a new scheme for Ozone Filesystem where all volumes (and buckets) 
> can be access from a single root.
> Alias: Rooted Ozone Filesystem.

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