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From "Shane Kumpf (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8160) Yarn Service Upgrade: Support upgrade of service that use docker containers
Date Tue, 17 Apr 2018 15:43:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16441045#comment-16441045
] 

Shane Kumpf commented on YARN-8160:
-----------------------------------

{quote}It might help to refine relaunch logic and reuse some of the existing code.
{quote}
 

I think there are parts of Relaunch that could be useful in the upgrade case, but I believe
some semantics will clash. The idea behind Relaunch is tore use the same NodeManager, the
container id, localization, and the working directory. In the Docker case, we go a step further
and run a {{docker start}} on the existing container. IIUC, the current upgrade design uses
re-init which cleans up the existing container prior to launching with a new CLC. These are
quite different in their approaches.

Where I see Relaunch features being beneficial is the reuse of the container id/NM, which
may allow for reusing the IP address previously assigned. Reuse of the existing work dir could
also be useful in some case, but I expect those cases are limited. However, I'm concerned
about Relaunch skipping localization and {{docker start}} won't work. At this point, it seems
like re-init might be more appropriate.

[~csingh] - based on your experience here, do you have a high level idea of how this will
work in the Docker case?

 

> Yarn Service Upgrade: Support upgrade of service that use docker containers 
> ----------------------------------------------------------------------------
>
>                 Key: YARN-8160
>                 URL: https://issues.apache.org/jira/browse/YARN-8160
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Chandni Singh
>            Assignee: Chandni Singh
>            Priority: Major
>
> Ability to upgrade dockerized  yarn native services.
> Ref: YARN-5637



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