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Date: Thu, 15 Aug 2013 21:37:52 +0000 (UTC)
From: "Robert Joseph Evans (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12661610.1375642116299.75865.1376602672130@arcas>
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Subject: [jira] [Commented] (YARN-1024) Define a virtual core unambigiously
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    [ https://issues.apache.org/jira/browse/YARN-1024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741518#comment-13741518 ] 

Robert Joseph Evans commented on YARN-1024:
-------------------------------------------

I am fine with that too.
                
> Define a virtual core unambigiously
> -----------------------------------
>
>                 Key: YARN-1024
>                 URL: https://issues.apache.org/jira/browse/YARN-1024
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>
> We need to clearly define the meaning of a virtual core unambiguously so that it's easy to migrate applications between clusters.
> For e.g. here is Amazon EC2 definition of ECU: http://aws.amazon.com/ec2/faqs/#What_is_an_EC2_Compute_Unit_and_why_did_you_introduce_it
> Essentially we need to clearly define a YARN Virtual Core (YVC).
> Equivalently, we can use ECU itself: *One EC2 Compute Unit provides the equivalent CPU capacity of a 1.0-1.2 GHz 2007 Opteron or 2007 Xeon processor.*

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