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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8298) Yarn Service Upgrade: Support express upgrade of a service
Date Wed, 08 Aug 2018 23:56:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16574051#comment-16574051

Eric Yang commented on YARN-8298:

[~csingh] While developing this patch, it was intended for the patch to run with Hadoop 3.1.2
CLI, and issue upgrade command to ServiceAM started by Hadoop 3.1.1.  This is the reason that
orchestration logic runs in ServiceClient as part of resource manager instead of ServiceAM.
 From architectural point of view, it would be best for upgrade logic to run in ServiceAM.
 Hadoop 3.1.1 ServiceAM does not have express upgrade logic.  Therefore, express upgrade is
triggered using ServiceState that can be understood by older ServiceAM.  For architectural
correctness, it is in our interest to introduce a ServiceState that can be understood by ServiceAM
as express upgrade.  This helps us to move orchestration logic from ServiceClient to ServiceMaster.
 RM can be relief from upgrade logic burden.  

This would be an incompatible change to ServiceAM to gain new express upgrade abilities. 
Therefore, I remove 3.1.2 from targeted version.

> Yarn Service Upgrade: Support express upgrade of a service
> ----------------------------------------------------------
>                 Key: YARN-8298
>                 URL: https://issues.apache.org/jira/browse/YARN-8298
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 3.1.1
>            Reporter: Chandni Singh
>            Assignee: Chandni Singh
>            Priority: Major
>         Attachments: YARN-8298.001.patch, YARN-8298.002.patch
> Currently service upgrade involves 2 steps
>  * initiate upgrade by providing new spec
>  * trigger upgrade of each instance/component
> We need to add the ability to upgrade the service in one shot:
>  # Aborting the upgrade will not be supported
>  # Upgrade finalization will be done automatically.

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