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https://issues.apache.org/jira/browse/ZOOKEEPER-555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12766154#action_12766154
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Patrick Hunt commented on ZOOKEEPER-555:
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That sounds reasonable. 

Alternately, might you use the sequence numbers themselves to ascertain the 
"version"?

I was thinking something like: you have a child list with seq numbers

version = x,y  where x is count, y is last seq number

1 2 3 => version is 3,3
znode 2 drops
1 3 => version is 2,3
a new znode is added
1 3 4 => version is 3,4

so the server would see 3,3 2,3 3,3 2,3 in your example

x,y where x can only decrease as time increases unless y increases. therefore 
the second 3,3 2,3 would be ignored (ie old version)

> Add stat information to GetChildrenResponse
> -------------------------------------------
>
>                 Key: ZOOKEEPER-555
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-555
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: c client, contrib-bindings, java client, server
>    Affects Versions: 3.3.0
>            Reporter: Árni Már Jónsson
>            Assignee: Árni Már Jónsson
>            Priority: Minor
>             Fix For: 3.3.0
>
>         Attachments: getchildren_stat.patch
>
>
> GetChildren() is the only non-create/delete API which does not include the 
> node stat information. I propose that the definition of GetChildren() should 
> be:
>     class GetChildrenResponse {
>         vector<ustring> children;
>         org.apache.zookeeper.data.Stat stat;
>     }
> There is a trivial fix to the server (FinalRequestProcessor.java): rsp = new 
> GetChildrenResponse(children, stat);
> And something similar to the  client library.

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