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https://issues.apache.org/jira/browse/ZOOKEEPER-1721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13703403#comment-13703403
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Raul Gutierrez Segales commented on ZOOKEEPER-1721:
---------------------------------------------------

In Linux this is as easy as setting dataDir and dataLogDir to somewhere inside 
/dev/shm (possibly other platforms support something similar). Not sure it's 
worth supporting this with code as it might unnecessarily complicate other 
sections. 
                
> Ability to run without writing to disk
> --------------------------------------
>
>                 Key: ZOOKEEPER-1721
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1721
>             Project: ZooKeeper
>          Issue Type: New Feature
>          Components: server
>    Affects Versions: 3.4.5
>            Reporter: Radim Kolar
>
> I use zookeeper for cluster synchronization. We have no need for keeping 
> persistent state across zookeeper restarts. For performance enhancement would 
> be good to have possibility to run without writing snapshots and logs.

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