Wangda Tan commented on YARN-2904:

I'm not sure if this problem related to YARN-3561, looks like similar problem. 
Linked the two JIRAs.

> Use linux cgroups to enhance container tear down
> ------------------------------------------------
>                 Key: YARN-2904
>                 URL: https://issues.apache.org/jira/browse/YARN-2904
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager
>    Affects Versions: 2.6.0
>            Reporter: Nathan Roberts
> If we are launching yarn containers within cgroups, linux provides some 
> guarantees that can help completely tear down a container.  Specifically, 
> linux guarantees that tasks can't escape a cgroup. We can use this fact to 
> tear down a yarn container without leaking tasks.
> Today, a SIGTERM is sent to the session (normally lead by bash). When the 
> session leader exits, the LCE sees this and assumes all resources have been 
> given back to the system. This is not guaranteed. Example: YARN-2809 
> implements a workaround that is only necessary because tasks are still 
> lingering within the cgroup when the nodemanager attempts to delete it.  

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