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https://issues.apache.org/jira/browse/YARN-2014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14988106#comment-14988106
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Jason Lowe commented on YARN-2014:
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No, AFAIK this was never fixed.  As I mentioned earlier, my best guess was that 
it was related to the significantly increased classloading that 2.x is doing 
relative to 0.23.

> Performance: AM scaleability is 10% slower in 2.4 compared to 0.23.9
> --------------------------------------------------------------------
>
>                 Key: YARN-2014
>                 URL: https://issues.apache.org/jira/browse/YARN-2014
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.4.0
>            Reporter: patrick white
>            Assignee: Jason Lowe
>
> Performance comparison benchmarks from 2.x against 0.23 shows AM scalability 
> benchmark's runtime is approximately 10% slower in 2.4.0. The trend is 
> consistent across later releases in both lines, latest release numbers are:
> 2.4.0.0     runtime 255.6 seconds (avg 5 passes)
> 0.23.9.12 runtime 230.4 seconds (avg 5 passes)
> Diff: -9.9% 
> AM Scalability test is essentially a sleep job that measures time to launch 
> and complete a large number of mappers.
> The diff is consistent and has been reproduced in both a larger (350 node, 
> 100,000 mappers) perf environment, as well as a small (10 node, 2,900 
> mappers) demo cluster.



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