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https://issues.apache.org/jira/browse/ZOOKEEPER-383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705990#action_12705990
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Flavio Paiva Junqueira commented on ZOOKEEPER-383:
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createLedger, openLedger, and closeLedger are operations that do not involve 
talking to bookies, so they don't go into the same pipeline as addEntry and 
readEntry operations. Instead, they are executed by the application thread when 
invoked. These operations do require talking to ZooKeeper, though. 

Making such operations asynchronous in the sense that a different thread 
executes the operation may require some restructuring. Perhaps what we can do 
is have ClientCBWorker executing the operation and calling back the application 
client. 

> Asynchronous version of createLedger()
> --------------------------------------
>
>                 Key: ZOOKEEPER-383
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-383
>             Project: Zookeeper
>          Issue Type: New Feature
>          Components: contrib-bookkeeper
>            Reporter: Utkarsh Srivastava
>            Assignee: Flavio Paiva Junqueira
>
> While there are async versions for read and write, there is no async version 
> for creating a ledger. This can cause applications to have to change their 
> whole thread design. 
> It should be easier and more consistent to add an async version of 
> createLedger().

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