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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4726) [Umbrella] Allocation reuse for application upgrades
Date Thu, 31 Mar 2016 17:00:29 GMT

    [ https://issues.apache.org/jira/browse/YARN-4726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15220217#comment-15220217

Wangda Tan commented on YARN-4726:


Thanks for raising these JIRAs, they are required by a couple of scheduling improvements.
Before starting implementation, could you add a design doc so we can understand better about

> [Umbrella] Allocation reuse for application upgrades
> ----------------------------------------------------
>                 Key: YARN-4726
>                 URL: https://issues.apache.org/jira/browse/YARN-4726
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Vinod Kumar Vavilapalli
> See overview doc at YARN-4692, copying the sub-section to track all related efforts.
> Once auto-­restart of containers is taken care of (YARN-4725), we need to address what
I believe is the second most important reason for service containers to restart : upgrades.
Once a service is running on YARN, the way container allocation-­lifecycle works, any time
the container exits, YARN will reclaim the resources. During an upgrade, with multitude of
other applications running in the system, giving up and getting back resources allocated to
the service is hard to manage. Things like N​ode­Labels in YARN ​help this cause but
are not straight­forward to use to address the app­-specific use­cases.
> We need a first class way of letting application reuse the same resource­allocation
for multiple launches of the processes inside the container. This is done by decoupling allocation
lifecycle and the process life­cycle.
> The JIRA YARN-1040 initiated this conversation. We need two things here: 
>  - (1) (​Task) ​the ApplicationMaster should be able to use the same container-allocation
and issue multiple s​tartContainer​requests to the NodeManager.
>  - (2) [(Task) To support the upgrade of the ApplicationMaster itself, clients should
be able to inform YARN to restart AM within the same allocation but with new bits.
> The JIRAs YARN-3417 and YARN-4470 talk about the second task above ...

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