Steve Loughran commented on YARN-2571:

All the registry code is there (slider uses it), except two bits of the RM side
# create the base user path on app launch (in case the app needs it). This 
needs to be done by a process with the right permissions on ZK; it also makes 
sure that the user path is created with the perms to allow the RM/admin to 
delete it
# purge entries on container/AM failure

There was push-back from the YARN team on #2; not for the RM. I do still think 
#2 is needed. Irrespective of that, there is a main() entry point in the 2.7+ 
code which offers a CLI to create the reg; its just without docs or tests. 
Email me direct if you want to start using the code & I'll help you

> RM to support YARN registry 
> ----------------------------
>                 Key: YARN-2571
>                 URL: https://issues.apache.org/jira/browse/YARN-2571
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>              Labels: BB2015-05-TBR
>         Attachments: YARN-2571-001.patch, YARN-2571-002.patch, 
> YARN-2571-003.patch, YARN-2571-005.patch, YARN-2571-007.patch, 
> YARN-2571-008.patch, YARN-2571-009.patch, YARN-2571-010.patch
> The RM needs to (optionally) integrate with the YARN registry:
> # startup: create the /services and /users paths with system ACLs (yarn, hdfs 
> principals)
> # app-launch: create the user directory /users/$username with the relevant 
> permissions (CRD) for them to create subnodes.
> # attempt, container, app completion: remove service records with the 
> matching persistence and ID

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