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From "Brandon Williams (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-7839) Support standard EC2 naming conventions in Ec2Snitch
Date Fri, 12 Sep 2014 21:41:34 GMT


Brandon Williams commented on CASSANDRA-7839:

Let's a) target 3.0, b) switch the default to full so new clusters aren't stuck in legacy
mode (I'll mention the change in NEWS for upgraders) and c) add tests for full.

> Support standard EC2 naming conventions in Ec2Snitch
> ----------------------------------------------------
>                 Key: CASSANDRA-7839
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Gregory Ramsperger
>            Assignee: Gregory Ramsperger
>         Attachments: conditionally-use-full-Amazon-style-naming-for-dc.patch
> The EC2 snitches use datacenter and rack naming conventions inconsistent with those presented
in Amazon EC2 APIs as region and availability zone. A discussion of this is found in CASSANDRA-4026.
This has not been changed for valid backwards compatibility reasons. Using SnitchProperties,
it is possible to switch between the legacy naming and the full, AWS-style naming. 
> Proposal:
> * introduce a property (ec2_naming_scheme) to switch naming schemes.
> * default to current/legacy naming scheme
> * add support for a new scheme ("full") which is consistent AWS conventions
> ** data centers will be the region name, including the number
> ** racks will be the availability zone name, including the region name
> Examples:
> * * legacy* : datacenter is the part of the availability zone name preceding the last
"\-" when the zone ends in \-1 and includes the number if not \-1. Rack is the portion of
the availability zone name following  the last "\-".
> ** us-west-1a => dc: us-west, rack: 1a
> ** us-west-2b => dc: us-west-2, rack: 2b; 
> * *full* : datacenter is the part of the availability zone name preceding zone letter.
rack is the entire availability zone name.
> ** us-west-1a => dc: us-west-1, rack: us-west-1a
> ** us-west-2b => dc: us-west-2, rack: us-west-2b; 

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