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https://issues.apache.org/jira/browse/HADOOP-6392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12782645#action_12782645
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Tom White commented on HADOOP-6392:
-----------------------------------

Colocation is the default, but splitting the namenode/jobtracker is better for 
large clusters. Good point about using a larger instance for the master - I've 
opened HADOOP-6393 for this.

> Run namenode and jobtracker on separate EC2 instances
> -----------------------------------------------------
>
>                 Key: HADOOP-6392
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6392
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: contrib/ec2
>            Reporter: Tom White
>            Assignee: Tom White
>
> Replace concept of "master" with that of "namenode" and "jobtracker". Still 
> need to be able to run both on one node, of course.

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