Daryn Sharp created HADOOP-15212:
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             Summary: Add independent secret manager method for logging expired 
tokens
                 Key: HADOOP-15212
                 URL: https://issues.apache.org/jira/browse/HADOOP-15212
             Project: Hadoop Common
          Issue Type: Improvement
          Components: security
    Affects Versions: 2.7.6
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp


{{AbstractDelegationTokenSecretManager#removeExpiredToken}} has two phases.  
First phase synchronizes to collect expired tokens.  Second phase loops over 
the collected tokens to log them while not holding the monitor.

HDFS-13112 needs to acquire the namesystem lock during the second logging 
phase, which requires splitting the method apart to allow a method override.



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