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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6157) Selectively Disable hinted handoff for a data center
Date Thu, 09 Jan 2014 03:08:51 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13866244#comment-13866244
] 

Jonathan Ellis commented on CASSANDRA-6157:
-------------------------------------------

So...  not to bikeshed myself, but what format should we use here?

I suggested {{ {'dc1', 'dc2'} }} (python set literals, admittedly somewhat obscure), other
options could be {{ ['dc1', 'dc2'] }} (json list) or {{ "dc1,dc2" }} (CDL).  What we have
here is {{ {dc1,dc2} }} which is invalid just about everything. :)

Suggest just switching to CDL?

(I don't think we can have a YAML construct that can be "either a string, or a yaml list"
but I'm not an expert so I may be wrong on that point.)

P.S. We typically just use Config as a "raw values" dump and do extra parsing in DatabaseDescriptor
if necessary.

> 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: 2.0.5
>
>         Attachments: trunk-6157-v2.diff, trunk-6157-v3.diff, trunk-6157-v4.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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