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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1024) Define a virtual core unambigiously
Date Mon, 05 Aug 2013 22:44:48 GMT

    [ https://issues.apache.org/jira/browse/YARN-1024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13730077#comment-13730077
] 

Arun C Murthy commented on YARN-1024:
-------------------------------------

[~jlowe] Yep, it does make sense to talk about a more explicit 'vector of cores' model as
we've discussed in past - that said, I agree it's too early.
                
> 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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