Sanjay Radia commented on YARN-913:

Some feedback:
# rename {{RegistryOperations.create()}} to {{bind()}}
# rename {{org/apache/hadoop/yarn/registry/client/services}} to
# move all ZK classes under
{{org/apache/hadoop/yarn/registry/client/impl/zk}}, i.e. the current
implementations of the registry client
# {{RegistryOperations}} implementations to remove declaration of
exceptions other than IOE.
# {{RegistryOperations.resolve()} implementation should not mention
record headers in exception text: that's an implementation detail
# Add README under {{org.apache.hadoop.yarn.registry.server}} to
emphasize this is server-side code
# Allow {{ServiceRecord}} to support arbitrary key-values
# remove {{yarn_id}} & {{yarn_persistence}} ffields rom
{{ServiceRecord}}, moving them to the set of arbitrary key-values This
ensures that there isn't explicit hard-coding of the assumption "these
are YARN apps" from the records.

> 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, YARN-913-003.patch, 
> YARN-913-003.patch, YARN-913-004.patch, YARN-913-006.patch, 
> YARN-913-007.patch, YARN-913-008.patch, YARN-913-009.patch, 
> YARN-913-010.patch, YARN-913-011.patch, YARN-913-012.patch, 
> YARN-913-013.patch, YARN-913-014.patch, YARN-913-015.patch, 
> YARN-913-016.patch, YARN-913-017.patch, YARN-913-018.patch, yarnregistry.pdf, 
> 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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