fanshilun created HADOOP-18427:
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             Summary: Improve ZKDelegationTokenSecretManager#startThead With 
recommended methods.
                 Key: HADOOP-18427
                 URL: https://issues.apache.org/jira/browse/HADOOP-18427
             Project: Hadoop Common
          Issue Type: Improvement
          Components: common
    Affects Versions: 3.4.0
            Reporter: fanshilun
            Assignee: fanshilun


When reading the code, I found a deprecated method to use. In 
ZKDelegationTokenSecretManager#startThead, the code here uses the Curator's 
EnsurePath,
But EnsurePath is deprecated, use the recommended method instead

public class EnsurePath
Deprecated.
Since 2.9.0 - Prefer 
CuratorFramework.create().creatingParentContainersIfNeeded() or 
CuratorFramework.exists().creatingParentContainersIfNeeded()



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