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Posted to commits@cassandra.apache.org by "Sylvain Lebresne (JIRA)" <ji...@apache.org> on 2014/08/06 11:27:12 UTC
[jira] [Updated] (CASSANDRA-7252) RingCache cannot be configured to
use local DC only
[ https://issues.apache.org/jira/browse/CASSANDRA-7252?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sylvain Lebresne updated CASSANDRA-7252:
----------------------------------------
Reviewer: Jonathan Ellis
> 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
>
> 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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