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https://issues.apache.org/jira/browse/CASSANDRA-1654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924754#action_12924754
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Jon Hermes commented on CASSANDRA-1654:
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A region is a DC, a zone is a Rack.
The metadata is per-node, so it'll have to go somewhere in Config.
> EC2Snitch
> ---------
>
> Key: CASSANDRA-1654
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1654
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Jon Hermes
> Fix For: 0.7.1
>
>
> This will be a snitch extending AbstractNetworkTopologySnitch that pulls DC
> from instance metadata placement_availability_zone.
> I don't think we can get rack information so the choice is between picking
> something unique-per-machine to be the rack or assigning everything in the DC
> the same rack. Second seems easier, so let's use placement_availability_zone
> for rack, too.
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