Zhijie Shen updated YARN-2715:
    Attachment: YARN-2715.1.patch

Made a patch with the following changes:

1. Use "yarn.resourcemanager.proxyuser" instead of 
"yarn.resourcemanager.webapp.proxyuser" as the RM proxy user prefix for both 
RPC and HTTP channel.

2. Before setting ProxyUsers#sip, use "yarn.resourcemanager.proxyuser" to 
overwrite "hadoop.proxyuser" configurations if it exists.

3. Always read configurations with "hadoop.proxyuser" for consistency.

> Proxy user is problem for RPC interface if 
> yarn.resourcemanager.webapp.proxyuser is not set.
> --------------------------------------------------------------------------------------------
>                 Key: YARN-2715
>                 URL: https://issues.apache.org/jira/browse/YARN-2715
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>            Priority: Blocker
>         Attachments: YARN-2715.1.patch
> After YARN-2656, if people set hadoop.proxyuser for the client<-->RM RPC 
> interface, it's not going to work, because ProxyUsers#sip is a singleton per 
> daemon. After YARN-2656, RM has both channels that want to set this 
> configuration: RPC and HTTP. RPC interface sets it first by reading 
> hadoop.proxyuser, but it is overwritten by HTTP interface, who sets it to 
> empty because yarn.resourcemanager.webapp.proxyuser doesn't exist.
> The fix for it could be similar to what we've done for YARN-2676: make the 
> HTTP interface anyway source hadoop.proxyuser first, then 
> yarn.resourcemanager.webapp.proxyuser.

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