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From "Chandni Singh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8298) Yarn Service Upgrade: Support express upgrade of a service
Date Mon, 20 Aug 2018 18:25:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16586347#comment-16586347
] 

Chandni Singh commented on YARN-8298:
-------------------------------------

[~eyang] Supporting orchestration of upgrade by ServiceMaster requires much more work and
is blocked by https://issues.apache.org/jira/browse/YARN-8665

There is another major problem with express upgrade. The instances of a single component should
also be done one by one (rolling fashion). Otherwise, upgrade can cause disruption in component
availability. One of the main reasons behind upgrade is that service is not disrupted. However
if we upgrade all the instances in parallel, then failure in upgrade causes disruption.

There are 2 ways to proceed:
1. Support canceling upgrade first https://issues.apache.org/jira/browse/YARN-8665 and then
re-work this jira
2. We merge this way of express upgrade where all instances are upgraded in parallel. It is
a convenient way for dev testing.

I am fine with either way. 

> 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, YARN-8298.003.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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