Kishore Chaliparambil updated YARN-2884:
    Attachment: YARN-2884-V6.patch

Fixed the checkstyle issues.

Could not address couple of issues:
1) Checkstyle: YarnConfiguration.java - File length exceeds 2000 lines.
2) Checkstyle:ApplicationMasterService.java: two lines are 81 char long
3) Checkstyle:ContainerLaunch.java:689:3: Method length is 172 lines (max 
allowed is 150)
4) Checkstyle: Warning that "member hides a field" is not fixed. This happens 
in even for all existing members
5) Findbug report is empty

> Proxying all AM-RM communications
> ---------------------------------
>                 Key: YARN-2884
>                 URL: https://issues.apache.org/jira/browse/YARN-2884
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager, resourcemanager
>            Reporter: Carlo Curino
>            Assignee: Kishore Chaliparambil
>         Attachments: YARN-2884-V1.patch, YARN-2884-V2.patch, 
> YARN-2884-V3.patch, YARN-2884-V4.patch, YARN-2884-V5.patch, YARN-2884-V6.patch
> We introduce the notion of an RMProxy, running on each node (or once per 
> rack). Upon start the AM is forced (via tokens and configuration) to direct 
> all its requests to a new services running on the NM that provide a proxy to 
> the central RM. 
> This give us a place to:
> 1) perform distributed scheduling decisions
> 2) throttling mis-behaving AMs
> 3) mask the access to a federation of RMs

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