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https://issues.apache.org/jira/browse/AMBARI-24483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17611669#comment-17611669
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Zhiguo Wu commented on AMBARI-24483:
------------------------------------

Thanks [~jonathanhurley] ! Would you like to create another PR for trunk branch 
?

> Timeline v2 HBase Does Start After Upgrade Due to Missing System Queue
> ----------------------------------------------------------------------
>
>                 Key: AMBARI-24483
>                 URL: https://issues.apache.org/jira/browse/AMBARI-24483
>             Project: Ambari
>          Issue Type: Bug
>    Affects Versions: 2.7.0
>            Reporter: Jonathan Hurley
>            Assignee: Jonathan Hurley
>            Priority: Blocker
>              Labels: pull-request-available
>             Fix For: 2.7.1
>
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> *During Upgrade*
> # If cluster is big i.e >50GB and each machines has minimum 10GB resources
> #* If *yarn-system* queue doesn't exist then we shall create a queue with 
> *zero capacity*. 
> #* All the necessary setting for queue such as *queue-priority*, 
> *queue-acls*, *disabling pre-emption* for this queue are set.
> #* ats-hbase app queue name also set to *yarn-system*
> #* But *do NOT* enable system service mode by default. Let upgrade happens in 
> embedded mode successfully. 
> #* Post upgrade, admin can change flag to enable system_service mode if 
> required by providing sufficient capacity to *yarn-system* queue. This step 
> *need to be documented.*
> # If cluster is small
> #* Continue upgrade in embedded mode without creating a yarn-system queue. 



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