Steve Loughran updated YARN-913:
    Attachment: YARN-913-001.patch

YARN 913 registry, patch 001

# ZK based registry YARN service running in the RM. It is currently optional as 
to whether this is enabled
# yarn service for clients to use & register
# mini ZK service for use in tests —and an optional feature of any 
MiniYarnCluster (credit to Twill team here)

Not implemented
# cleanup policies (after container exit, app attempt, app exit)
# full security (The RM-based service creates the user dir, but the policies 
need to be set up to give the user write access under that —and nobody else)

> 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, 
> RegistrationServiceDetails.txt, YARN-913-001.patch
> 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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