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From "Miklos Szegedi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6757) Refactor the usage of yarn.nodemanager.linux-container-executor.cgroups.mount-path
Date Fri, 30 Jun 2017 20:04:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16070635#comment-16070635
] 

Miklos Szegedi commented on YARN-6757:
--------------------------------------

See also the discussion in YARN-6515, why we need this.

> Refactor the usage of yarn.nodemanager.linux-container-executor.cgroups.mount-path
> ----------------------------------------------------------------------------------
>
>                 Key: YARN-6757
>                 URL: https://issues.apache.org/jira/browse/YARN-6757
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 3.0.0-alpha4
>            Reporter: Miklos Szegedi
>            Assignee: Miklos Szegedi
>            Priority: Minor
>         Attachments: YARN-6757.000.patch
>
>
> We should add the ability to specify a custom cgroup path. This is how the documentation
of inux-container-executor.cgroups.mount-path would look like:
> {code}
> Requested cgroup mount path. Yarn has built in functionality to discover
>     the system cgroup mount paths, so use this setting only, if the discovery does not
work.
>     This path must exist before the NodeManager is launched.
>     The location can vary depending on the Linux distribution in use.
>     Common locations include /sys/fs/cgroup and /cgroup.
>     If cgroups are not mounted, set yarn.nodemanager.linux-container-executor.cgroups.mount
>     to true. In this case it specifies, where the LCE should attempt to mount cgroups
if not found.
>     If cgroups is accessible through lxcfs or some other file system,
>     then set this path and yarn.nodemanager.linux-container-executor.cgroups.mount to
false.
>     Yarn tries to use this path first, before any cgroup mount point discovery.
>     If it cannot find this directory, it falls back to searching for cgroup mount points
in the system.
>     Only used when the LCE resources handler is set to the CgroupsLCEResourcesHandler
> {code}



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