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https://issues.apache.org/jira/browse/CASSANDRA-197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713034#action_12713034
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Jonathan Ellis commented on CASSANDRA-197:
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It will be a JVM-only option since that is what the server runs on, but that's 
less of an issue than you might think given how many languages have excellent 
JVM implementations (JRuby, Jython, ...)

> Expose ring map to client for more direct access
> ------------------------------------------------
>
>                 Key: CASSANDRA-197
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-197
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jun Rao
>            Assignee: Jun Rao
>         Attachments: issue197.patchv1
>
>
> For certain applications, it would be nice if a read is sent to a node that 
> owns the data locally. This saves an extra network hop. To do that, a client 
> will need to cache the ring map and use it to figure out the nodes owning a 
> row.

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