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From "Jun Rao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-197) Expose ring map to client for more direct access
Date Tue, 25 Aug 2009 00:16:59 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747153#action_12747153
] 

Jun Rao commented on CASSANDRA-197:
-----------------------------------

The intention of the new class RingCache is to make it easy to exploit the exposed endpoint
map. You just need to instantiate it and then call getEndPoint() to get the endpoints for
a given key. Take a look at it and see if it fits your need.

> 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
>          Components: Core
>            Reporter: Jun Rao
>            Assignee: Jun Rao
>         Attachments: flexjson.jar, issue197.patchv1, patch197.v2, patch197.v3
>
>
> 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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