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From "Chandni Singh (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (YARN-8160) Yarn Service Upgrade: Support upgrade of service that use docker containers
Date Wed, 08 Aug 2018 21:31:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16573888#comment-16573888
] 

Chandni Singh edited comment on YARN-8160 at 8/8/18 9:30 PM:
-------------------------------------------------------------

The reapContainer and cleaning of container files during cleanup can be mutually exclusive
to the run. Attached is the patch for it. I am testing it.


was (Author: csingh):
The cleaning of container files during cleanup can be mutually exclusive to the run. Attached
is the patch for it.

> 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
>              Labels: Docker
>         Attachments: YARN-8610.001.patch, container_e02_1533231998644_0009_01_000003.nm.log
>
>
> Ability to upgrade dockerized  yarn native services.
> Ref: YARN-5637
> *Background*
> Container upgrade is supported by the NM via {{reInitializeContainer}} api. {{reInitializeContainer}}
does *NOT* change the ContainerId of the upgraded container.
> NM performs the following steps during {{reInitializeContainer}}:
> - kills the existing process
> - cleans up the container
> - launches another container with the new {{ContainerLaunchContext}}
> NOTE: {{ContainerLaunchContext}} holds all the information that needs to upgrade the
container.
> With {{reInitializeContainer}}, the following does *NOT* change
> - container ID. This is not created by NM. It is provided to it and here RM is not creating
another container allocation.
> - {{localizedResources}} this stays the same if the upgrade does *NOT* require additional
resources IIUC.
>  
> The following changes with {{reInitializeContainer}}
> - the working directory of the upgraded container changes. It is *NOT* a relaunch. 
> *Changes required in the case of docker container*
> - {{reInitializeContainer}} seems to not be working with Docker containers. Investigate
and fix this.
> - [Future change] Add an additional api to NM to pull the images and modify {{reInitializeContainer}}
to trigger docker container launch without pulling the image first which could be based on
a flag.
>     -- When the service upgrade is initialized, we can provide the user with an option
to just pull the images  on the NMs.
>     -- When a component instance is upgrade, it calls the {{reInitializeContainer}} with
the flag pull-image set to false, since the NM will have already pulled the images.



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