[jira] [Commented] (YARN-4757) [Umbrella] Simplified discovery of services via DNS mechanisms

[Jonathan Maron (JIRA)]

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https://issues.apache.org/jira/browse/YARN-4757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15178629#comment-15178629
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Jonathan Maron commented on YARN-4757:
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I've actually been working on a DNS approach for some time.  I'll upload a 
document describing the approach soon.

> [Umbrella] Simplified discovery of services via DNS mechanisms
> --------------------------------------------------------------
>
>                 Key: YARN-4757
>                 URL: https://issues.apache.org/jira/browse/YARN-4757
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Jonathan Maron
>
> [See overview doc at YARN-4692, copying the sub-section (3.2.10.2) to track 
> all related efforts.]
> In addition to completing the present story of service­-registry (YARN-913), 
> we also need to simplify the access to the registry entries. The existing 
> read mechanisms of the YARN Service Registry are currently limited to a 
> registry specific (java) API and a REST interface. In practice, this makes it 
> very difficult for wiring up existing clients and services. For e.g, dynamic 
> configuration of dependent end­points of a service is not easy to implement 
> using the present registry­-read mechanisms, *without* code-changes to 
> existing services.
> A good solution to this is to expose the registry information through a more 
> generic and widely used discovery mechanism: DNS. Service Discovery via DNS 
> uses the well-­known DNS interfaces to browse the network for services. 
> YARN-913 in fact talked about such a DNS based mechanism but left it as a 
> future task. (Task) Having the registry information exposed via DNS 
> simplifies the life of services.



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