[jira] Updated: (CASSANDRA-197) Expose ring map to client for more direct access

["Jun Rao (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jun Rao updated CASSANDRA-197:
------------------------------

    Attachment: issue197.patchv1

Attach a patch.
--a new thrift api for obtaining the ring map.

--a RingCache class for the client to easily cache the ring map.

--an example test/org.apache.cassandra.service.TestRingCache.java that uses RingCache

> 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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