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Sandy Ryza commented on YARN-1024: ---------------------------------- bq. The speed that hardware permits a task to read from disk or over the network has can have just as large an impact on the processing power it consumes as whatever the task is doing. Meant: The speed that hardware permits a task to read from disk or over the network can have just as large an impact on the processing power it consumes as whatever the task is doing. > 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.* -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira