[jira] [Commented] (YARN-4758) Enable discovery of AMs by containers

["Junping Du (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-4758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15491898#comment-15491898 ] 

Junping Du commented on YARN-4758:
----------------------------------

Put up a design doc as attached after discussed offline with Jian and Vinod. To mates who are watching this JIRA, welcome comments.
In the meanwhile, start to do some POC patch which target to work with MAPREDUCE-6608 end to end soon.

> Enable discovery of AMs by containers
> -------------------------------------
>
>                 Key: YARN-4758
>                 URL: https://issues.apache.org/jira/browse/YARN-4758
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Junping Du
>         Attachments: YARN-4758. AM Discovery Service for YARN Container.pdf
>
>
> {color:red}
> This is already discussed on the umbrella JIRA YARN-1489.
> Copying some of my condensed summary from the design doc (section 3.2.10.3) of YARN-4692.
> {color}
> Even after the existing work in Work­preserving AM restart (Section 3.1.2 / YARN-1489), we still haven’t solved the problem of old running containers not knowing where the new AM starts running after the previous AM crashes. This is a specifically important problem to be solved for long running services where we’d like to avoid killing service containers when AMs fail­over. So far, we left this as a task for the apps, but solving it in YARN is much desirable. [(Task) This looks very much like service­-registry (YARN-913), but for app­containers to discover their own AMs.
> Combining this requirement (of any container being able to find their AM across fail­overs) with those of services (to be able to find through DNS where a service container is running - YARN-4757) will put our registry scalability needs to be much higher than that of just service end­points. This calls for a more distributed solution for registry readers  something that is discussed in the comments section of YARN-1489 and MAPREDUCE-6608.
> See comment https://issues.apache.org/jira/browse/YARN-1489?focusedCommentId=13862359&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13862359



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