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https://issues.apache.org/jira/browse/YARN-2904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15898688#comment-15898688
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Feng Yuan edited comment on YARN-2904 at 3/7/17 3:50 AM:
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In my humble opinion,Task process leak by some unknowable reason(YARN-6276) is
first step,and result to when deleteCgroup() will get os panic(this issue),so i
add the relation here.[~jlowe]
was (Author: feng yuan):
In my humble opinion,Task process leak but some unknowable
reason(YARN-6276),and result to when deleteCgroup() will get os panic(this
issue),so i add the relation here.[~jlowe]
> 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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