Steve Loughran commented on YARN-2139:

I don't think I was clear enough, sorry

HDFS disk IO takes place in the datanode *not in any YARN container*. 
Accordingly cgroup throttling of container disk IO has no effect on HDFS 
bandwidth/IOPs. Network throttling could, if it it limited loopback and remote 
network load -but anything over the unix-domain-sockets bypass isn't going over 
the tcp stack.

> Add support for disk IO isolation/scheduling for containers
> -----------------------------------------------------------
>                 Key: YARN-2139
>                 URL: https://issues.apache.org/jira/browse/YARN-2139
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Wei Yan
>            Assignee: Wei Yan

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