Ming Ma updated YARN-1897:
    Attachment: YARN-1897-5.patch

Based on the offline discussion with [~djp] [~ste...@apache.org] [~xgong] 
w.r.t. to YARN-4131 and signal container functionality, we decided to speed up 
the open source effort for signal container functionality. Instead of defining 
a comprehensive API to all scenarios, we prefer to addressing immediate 
scenarios first.

Here is the draft patch that provides the core signal container functionality 
so that users can use YARN CLI to capture thread dump of a container or kill a 
container. Things that will be covered by other jiras are:

* WebUI support.
* Thread dump support on windows.
* Batch support so that AM or applications can send several ordered requests at 
* Allow applications to specify custom command and have NM run it against the 

> Define SignalContainerRequest and SignalContainerResponse
> ---------------------------------------------------------
>                 Key: YARN-1897
>                 URL: https://issues.apache.org/jira/browse/YARN-1897
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>         Attachments: YARN-1897-2.patch, YARN-1897-3.patch, YARN-1897-4.patch, 
> YARN-1897-5.patch, YARN-1897.1.patch
> We need to define SignalContainerRequest and SignalContainerResponse first as 
> they are needed by other sub tasks. SignalContainerRequest should use 
> OS-independent commands and provide a way to application to specify "reason" 
> for diagnosis. SignalContainerResponse might be empty.

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