Steve Loughran updated YARN-913:
    Attachment: YARN-913-002.patch

Patch -002

# adds persistence policy
# {{RegistryOperationsService}} implements callbacks for various RM events, and 
implements the setup/purge behaviour underneath.
# adds a new class in the resource manager, {{RegistryService}}. This bridges 
from YARN to the registry by subscribing to application and container events, 
translating and forwarding to the  {{RegistryOperationsService}} where they may 
trigger setup/purge operations 
# Hooks this up to the RM
# Extends the DistributedShell by enabling it to register service records with 
the different persistence options.
# Adds a test to verify the distributed shell does register the entries, and 
that the purgeable ones are purged after the application completes.

This means the {{TestDistributedShell}} test is now capable of verifying that 
YARN applications can register themselves, that they can then be discovered, 
and that the RM cleans up after they terminate.

> Add a way to register long-lived services in a YARN cluster
> -----------------------------------------------------------
>                 Key: YARN-913
>                 URL: https://issues.apache.org/jira/browse/YARN-913
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: api, resourcemanager
>    Affects Versions: 2.5.0, 2.4.1
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>         Attachments: 2014-09-03_Proposed_YARN_Service_Registry.pdf, 
> 2014-09-08_YARN_Service_Registry.pdf, RegistrationServiceDetails.txt, 
> YARN-913-001.patch, YARN-913-002.patch, yarnregistry.pdf, yarnregistry.tla
> In a YARN cluster you can't predict where services will come up -or on what 
> ports. The services need to work those things out as they come up and then 
> publish them somewhere.
> Applications need to be able to find the service instance they are to bond to 
> -and not any others in the cluster.
> Some kind of service registry -in the RM, in ZK, could do this. If the RM 
> held the write access to the ZK nodes, it would be more secure than having 
> apps register with ZK themselves.

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