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https://issues.apache.org/jira/browse/HADOOP-16034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16737165#comment-16737165
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Steve Loughran commented on HADOOP-16034:
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Patch for trunk; for anyone backporting, note that HADOOP-15821 moved the
registry module, so a simple cherrypick will not suffice
> Hadoop/Yarn registry to create Curator binding on demand
> --------------------------------------------------------
>
> Key: HADOOP-16034
> URL: https://issues.apache.org/jira/browse/HADOOP-16034
> Project: Hadoop Common
> Issue Type: Improvement
> Components: registry
> Affects Versions: 3.1.1
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
> Attachments: HADOOP-16034-001.patch
>
>
> If enough slider worker nodes are created, and then each create a Registry
> client, then ZK can overload even when they aren't making calls of the
> registry. Why so? Because curator gets started up on serviceStart(), even
> when not used.
> Proposed fix: make it on-demand on use of a ZK read/write operation
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