Jason Lowe created YARN-4041:
--------------------------------

             Summary: 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


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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