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https://issues.apache.org/jira/browse/YARN-913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14161465#comment-14161465
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Steve Loughran commented on YARN-913:
-------------------------------------
Sanjay, I can do most of these,
* w.r.t. the README, we have a javadoc {{package-info.java}}, that's enough.
* I propose restricting the custom values that a service record to have to
string attributes. support arbitrary JSON opens things up to people embedding
entire custom JSON docs in there, which could kill the notion of having
semi-standardised records that other apps can work with + published API
endpoints for any extra stuff *outside the registry*
* I'm going to rename the yarn fields back to {{yarn:id}} and
{{yarn:persistence}} if Jersey+jackson marshalls them reliably once they aren't
introspection-driven. It makes the yarn-nature of them clearer.
> 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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