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https://issues.apache.org/jira/browse/HADOOP-18519?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Melissa You resolved HADOOP-18519.
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    Resolution: Fixed

> Backport HDFS-15383 and HADOOP-17835 to branch-3.3
> --------------------------------------------------
>
>                 Key: HADOOP-18519
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18519
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 3.3.5
>            Reporter: Melissa You
>            Assignee: Melissa You
>            Priority: Major
>              Labels: pull-request-available
>
> This is a sub-task of HADOOP-18518 to upgrade zk&curator on 3.3 branches.
> It contains clean cherry pick from 
> [https://github.com/apache/hadoop/pull/3266] which solved the deprecation of 
> PathChildrenCache/TreeCache in new ZK. 
> Also clean cherry pick from https://issues.apache.org/jira/browse/HDFS-15383 
> because PR-3266 is based on this earlier change, specifically 
> isTokenWatcherEnabled was introduced in 
> [ZKDelegationTokenSecretManager.java|https://github.com/apache/hadoop/pull/2047/files#diff-f65a8ac81e253e85af159ba041fbad62fbb34b5bd909c1e9fc93d58222f406b9]



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