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https://issues.apache.org/jira/browse/CASSANDRA-6157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13866406#comment-13866406
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sankalp kohli commented on CASSANDRA-6157:
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Here are the problems and why i chose what we have.
{'dc1', 'dc2'} and ['dc1', 'dc2'] - If you specify this, snake yaml does not
accept it as a string. It needs to be wrapped in "" like "{'dc1','dc2'}"
"dc1,dc2" or "dc1"- This can be done. In Java, this will come as a string
dc1,dc2 or dc1(without quotes") .
One of the problems with this is that if someone has a typo in true or false,
it will treat is as a data center name. I have to do something like
if (hinted_handoff_enabled.toLowerCase().equals("true") ||
hinted_handoff_enabled.toLowerCase().equals("false"))
{
hinted_handoff_enabled_default =
Boolean.parseBoolean(hinted_handoff_enabled);
} else {
split it by , and get the dc names.
}
So if someone types it as true1, we will treat it as a data center name.
If this is fine, I can do the changes.
> 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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