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Date: Sun, 17 Aug 2014 20:18:18 +0000 (UTC)
From: "Aleksey Yeschenko (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.12714856.1400269384420.17856.1408306698326@arcas>
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Subject: [jira] [Commented] (CASSANDRA-7252) RingCache cannot be configured
 to use local DC only
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    [ https://issues.apache.org/jira/browse/CASSANDRA-7252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14100092#comment-14100092 ] 

Aleksey Yeschenko commented on CASSANDRA-7252:
----------------------------------------------

bq. Do you want me to create another ticket for the address option?

If you feel like it and still need it - go for it. (This doesn't mean I'm for it - I haven't looked into the need for it, myself).

> RingCache cannot be configured to use local DC only
> ---------------------------------------------------
>
>                 Key: CASSANDRA-7252
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7252
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>            Reporter: Robbie Strickland
>            Assignee: Robbie Strickland
>              Labels: patch
>             Fix For: 2.0.10, 2.1.1
>
>         Attachments: cassandra-2.0.7-7252-2.txt, cassandra-2.0.7-7252.txt
>
>
> RingCache always calls describe_ring, returning the entire cluster.  Considering it's used in the context of writing from Hadoop (which is typically in a multi-DC configuration), this is often not desirable behavior.  In some cases there may be high-latency connections between the analytics DC and other DCs.
> I am attaching a patch that adds an optional config value to tell RingCache to use local nodes only, in which case it calls describe_local_ring instead.  It also adds helpful failed host information to IOExceptions thrown in AbstractColumnFamilyOutputFormat.createAuthenticatedClient, CqlRecordWriter, and ColumnFamilyRecordWriter.  This allows a user to more easily solve related connectivity issues.


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