[jira] [Commented] (CASSANDRA-7252) RingCache cannot be configured to use local DC only

["Robbie Strickland (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-7252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14003408#comment-14003408 ] 

Robbie Strickland commented on CASSANDRA-7252:
----------------------------------------------

[~iamaleksey] I see you changed the fix version to 2.0.9.  Do you want me to rebase the patch?

> 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: Jonathan Ellis
>              Labels: patch
>             Fix For: 2.0.9
>
>         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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