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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-197) Expose ring map to client for more direct access
Date Mon, 24 Aug 2009 16:22:59 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12746940#action_12746940
] 

Jonathan Ellis commented on CASSANDRA-197:
------------------------------------------

+1 on the approach in general.  some nits:

        partitioner_ = DatabaseDescriptor.getPartitioner();

inline this in declaration

        Map<Token,EndPoint>endpointMap

spacing

        for (String seed : seeds_)

shouldn't this break after getting an answer?  shouldn't need to contact all seeds each time

    private void retrofitPorts(EndPoint endPoints[])

this should be encapsulated in tokenmetadata (yeah, I know it's that way in existing code)
-- have a cloneControl and cloneStorage method instead of forcing consumers of the api to
know that they need to do this "magic" fixup later.

> 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
>
>
> 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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