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https://issues.apache.org/jira/browse/YARN-4041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sunil G updated YARN-4041:
--------------------------
    Attachment: 0002-YARN-4041.patch

Thank you [~jianhe] and [~jlowe].
As per latest jenkins, patch needs rebase. Attaching a rebased version. Tests 
are passing locally.

> Slow delegation token renewal can severely prolong RM recovery
> --------------------------------------------------------------
>
>                 Key: YARN-4041
>                 URL: https://issues.apache.org/jira/browse/YARN-4041
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Sunil G
>         Attachments: 0001-YARN-4041.patch, 0002-YARN-4041.patch
>
>
> When the RM does a work-preserving restart it synchronously tries to renew 
> delegation tokens for every active application.  If a token server happens to 
> be down or is running slow and a lot of the active apps were using tokens 
> from that server then it can have a huge impact on the time it takes the RM 
> to process the restart.



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