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https://issues.apache.org/jira/browse/YARN-913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14153748#comment-14153748
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Steve Loughran commented on YARN-913:
-------------------------------------
Oh, and I renamed the field:
{code}
/**
* Pattern of a single entry in the registry path. : {@value}.
* <p>
* This is what constitutes a valid hostname according to current RFCs.
* Alphanumeric first two and last one digit, alphanumeric
* and hyphens allowed in between.
* <p>
* No upper limit is placed on the size of an entry.
*/
String VALID_PATH_ENTRY_PATTERN =
"([a-z0-9]|[a-z0-9][a-z0-9\\-]*[a-z0-9])";
{code}
> 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, 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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