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https://issues.apache.org/jira/browse/ZOOKEEPER-1167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13444695#comment-13444695
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Mahadev konar commented on ZOOKEEPER-1167:
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Marshall,
  Would you have sometime to add tests to the patch? Would be good to have this 
in the next 3.4 release if possible.
                
> C api lacks synchronous version of sync() call.
> -----------------------------------------------
>
>                 Key: ZOOKEEPER-1167
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1167
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: c client
>    Affects Versions: 3.3.3, 3.4.3, 3.5.0
>            Reporter: Nicholas Harteau
>            Assignee: Marshall McMullen
>             Fix For: 3.4.4, 3.5.0
>
>         Attachments: ZOOKEEPER-1167.patch
>
>
> Reading through the source, the C API implements zoo_async() which is the 
> zookeeper sync() method implemented in the multithreaded/asynchronous C API.  
> It doesn't implement anything equivalent in the non-multithreaded API.
> I'm not sure if this was oversight or intentional, but it means that the 
> non-multithreaded API can't guarantee consistent client views on critical 
> reads.
> The zkperl bindings depend on the synchronous, non-multithreaded API so also 
> can't call sync() currently.

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