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From "Lyuben Todorov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6157) Selectively Disable hinted handoff for a data center
Date Sat, 15 Feb 2014 14:47:19 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13902413#comment-13902413
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Lyuben Todorov commented on CASSANDRA-6157:
-------------------------------------------

Tested with a dc named "dc 2" (setting looked like: {{hinted_handoff_enabled: dc 2,dc1}})
As for adding the csv parser, all that is left is to add the parser's licence to C*_HOME/lib/licences.
I've [posted a branch|https://github.com/lyubent/cassandra/tree/hints_per_dc] with the license
and patch 5 applied (commit on 6341148f971fbf6b73e891f8784b389fc8054c20). Also fixed imports
in o.a.c.config.Config

+1

> Selectively Disable hinted handoff for a data center
> ----------------------------------------------------
>
>                 Key: CASSANDRA-6157
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6157
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: sankalp kohli
>            Assignee: sankalp kohli
>            Priority: Minor
>             Fix For: 2.0.6
>
>         Attachments: super-csv-2.1.0.jar, trunk-6157-v2.diff, trunk-6157-v3.diff, trunk-6157-v4.diff,
trunk-6157-v5.diff, trunk-6157.txt
>
>
> Cassandra supports disabling the hints or reducing the window for hints. 
> It would be helpful to have a switch which stops hints to a down data center but continue
hints to other DCs.
> This is helpful during data center fail over as hints will put more unnecessary pressure
on the DC taking double traffic. Also since now Cassandra is under reduced reduncany, we don't
want to disable hints within the DC. 



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