Allen Wittenauer updated YARN-445:
    Labels: BB2015-05-TBR  (was: )

> Ability to signal containers
> ----------------------------
>                 Key: YARN-445
>                 URL: https://issues.apache.org/jira/browse/YARN-445
>             Project: Hadoop YARN
>          Issue Type: Task
>          Components: nodemanager
>            Reporter: Jason Lowe
>            Assignee: Andrey Klochkov
>              Labels: BB2015-05-TBR
>         Attachments: MRJob.png, MRTasks.png, YARN-445--n2.patch, 
> YARN-445--n3.patch, YARN-445--n4.patch, 
> YARN-445-signal-container-via-rm.patch, YARN-445.patch, YARNContainers.png
> 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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