Fengnan Li created HDFS-15447:

             Summary: RBF: Add top owners metrics for delegation tokens
                 Key: HDFS-15447
                 URL: https://issues.apache.org/jira/browse/HDFS-15447
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Fengnan Li
            Assignee: Fengnan Li

Over time we have seen multiple times of token bombarding behavior either due 
to mistakes or user issuing huge amount of traffic. Having this metric will 
help figuring out much faster who/which service is owning these tokens and 
stopping the behavior quicker.

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