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https://issues.apache.org/jira/browse/YARN-2344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14072323#comment-14072323
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Allen Wittenauer commented on YARN-2344:
----------------------------------------

Moving this to YARN.

We still need a way to pause the Resource Manager from accepting new 
submissions.

> Provide a mechanism to pause the jobtracker
> -------------------------------------------
>
>                 Key: YARN-2344
>                 URL: https://issues.apache.org/jira/browse/YARN-2344
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: resourcemanager
>            Reporter: Hemanth Yamijala
>
> We've seen scenarios when we have needed to stop the namenode for a 
> maintenance activity. In such scenarios, if the jobtracker (JT) continues to 
> run, jobs would fail due to initialization or task failures (due to DFS). We 
> could restart the JT enabling job recovery, during such scenarios. But 
> restart has proved to be a very intrusive activity, particularly if the JT is 
> not at fault itself and does not require a restart. The ask is for a 
> admin-controlled feature to pause the JT which would take it to a state 
> somewhat analogous to the safe mode of DFS.



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