[jira] Commented: (CASSANDRA-1654) EC2Snitch

["Jon Hermes (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-1654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924754#action_12924754 ] 

Jon Hermes commented on CASSANDRA-1654:
---------------------------------------

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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