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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4757) [Umbrella] Simplified discovery of services via DNS mechanisms
Date Mon, 14 Mar 2016 18:00:37 GMT

    [ https://issues.apache.org/jira/browse/YARN-4757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15193769#comment-15193769
] 

Robert Joseph Evans commented on YARN-4757:
-------------------------------------------

[~aw], I am not expert on DNS so it is good to hear that you have thought through this and
done your homework.  I read up a little on SRV records and it looks like a good fit.  It still
does not change the need for 2 way authentication and making sure that we can restrict who
registers for a service, but because SRV records are not a drop in replacement for A/CNAME
records it should not be as big of an issue.

Clients are likely going to need to make changes to support SRV records, and from what I can
tell java does not come with built in support, not the end of the world, but also likely non-trivial.
 Especially when it looks like the industry has not decided on how they want to support http.
(Although I could be wrong on all of that, because like I said I am not an expert here)

I just want to be sure that you are thinking things through, and it looks like you are so
I am happy.

> [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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