Bikas Saha commented on YARN-445:

Sounds like an enhancement in the NM API. Moving under YARN-386. Please unlink 
if that is not correct.

I can see the usecase this seeks to solve. I am wondering what is the 
abstraction in the general case. That would help us to not change stuff for 
every similar use case. Keeping platform neutrality would be beneficial so that 
the usecases continue to work for non Java AM/tasks or on Windows.
> Ability to signal containers
> ----------------------------
>                 Key: YARN-445
>                 URL: https://issues.apache.org/jira/browse/YARN-445
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: nodemanager
>    Affects Versions: 2.0.5-beta
>            Reporter: Jason Lowe
> It would be nice if an ApplicationMaster could send signals to contaniers 
> such as SIGQUIT, SIGUSR1, etc.
> For example, in order to replicate the jstack-on-task-timeout feature 
> implemented by MAPREDUCE-1119 in Hadoop 0.21 the NodeManager needs an 
> interface for sending SIGQUIT to a container.  For that specific feature we 
> could implement it as an additional field in the StopContainerRequest.  
> However that would not address other potential features like the ability for 
> an AM to trigger jstacks on arbitrary tasks *without* killing them.  The 
> latter feature would be a very useful debugging tool for users who do not 
> have shell access to the nodes.

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