Patrick Hunt commented on ZOOKEEPER-472:

In general we should have tests but I'm fine with the no-test in this case, 
this is an optimization not a bug fix 
and I can't think of any test we could add that would benefit, we already have 
good test coverage on this area.

> Making DataNode not instantiate a HashMap when the node is ephmeral
> -------------------------------------------------------------------
>                 Key: ZOOKEEPER-472
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-472
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: server
>    Affects Versions: 3.1.1, 3.2.0
>            Reporter: Erik Holstad
>            Assignee: Erik Holstad
>            Priority: Minor
>             Fix For: 3.3.0
>         Attachments: zookeeper-472.patch, zookeeper-472.patch, 
> zookeeper-472.patch, zookeeper-472.patch, zookeeper-472.patch, 
> zookeeper-472.patch
> Looking at the code, there is an overhead of a HashSet object for that nodes 
> children, even though the node might be an ephmeral node and cannot have 
> children.

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