luhuachao created HADOOP-16069:
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             Summary: Support configure ZK_DTSM_ZK_KERBEROS_PRINCIPAL in 
ZKDelegationTokenSecretManager using principal with Schema /_HOST
                 Key: HADOOP-16069
                 URL: https://issues.apache.org/jira/browse/HADOOP-16069
             Project: Hadoop Common
          Issue Type: Improvement
    Affects Versions: 3.1.0
            Reporter: luhuachao


when use ZKDelegationTokenSecretManager with Kerberos, we cannot configure 
ZK_DTSM_ZK_KERBEROS_PRINCIPAL with principal like 'nn/_h...@example.com', we 
have to user principal like 'nn/hostn...@example.com'  here.



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