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Date: Tue, 29 Nov 2016 21:43:59 +0000 (UTC)
From: "Daniel Templeton (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.13019005.1478554169000.394235.1480455839200@Atlassian.JIRA>
In-Reply-To: <JIRA.13019005.1478554169000@Atlassian.JIRA>
References: <JIRA.13019005.1478554169000@Atlassian.JIRA> <JIRA.13019005.1478554169045@arcas>
Subject: [jira] [Commented] (YARN-5849) Automatically create YARN control
 group for pre-mounted cgroups
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archived-at: Tue, 29 Nov 2016 21:44:01 -0000


    [ https://issues.apache.org/jira/browse/YARN-5849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15706629#comment-15706629 ] 

Daniel Templeton commented on YARN-5849:
----------------------------------------

Thanks for the update.  A couple doc issues:

* In {{yarn-defaults.xml}}, you have "then the he."  Probably not what you meant.  Also, the sentence with that phrase doesn't make sense to me.  Do you mean that if the property is false, the directory doesn't exist, and the user has write permission, then the directory will be created?
* Same for {{NodeManagerCgroups.md}}

> Automatically create YARN control group for pre-mounted cgroups
> ---------------------------------------------------------------
>
>                 Key: YARN-5849
>                 URL: https://issues.apache.org/jira/browse/YARN-5849
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 2.7.3, 3.0.0-alpha1, 3.0.0-alpha2
>            Reporter: Miklos Szegedi
>            Assignee: Miklos Szegedi
>            Priority: Minor
>         Attachments: YARN-5849.000.patch, YARN-5849.001.patch, YARN-5849.002.patch, YARN-5849.003.patch, YARN-5849.004.patch, YARN-5849.005.patch
>
>
> Yarn can be launched with linux-container-executor.cgroups.mount set to false. It will search for the cgroup mount paths set up by the administrator parsing the /etc/mtab file. You can also specify resource.percentage-physical-cpu-limit to limit the CPU resources assigned to containers.
> linux-container-executor.cgroups.hierarchy is the root of the settings of all YARN containers. If this is specified but not created YARN will fail at startup:
> Caused by: java.io.FileNotFoundException: /cgroups/cpu/hadoop-yarn/cpu.cfs_period_us (Permission denied)
> org.apache.hadoop.yarn.server.nodemanager.util.CgroupsLCEResourcesHandler.updateCgroup(CgroupsLCEResourcesHandler.java:263)
> This JIRA is about automatically creating YARN control group in the case above. It reduces the cost of administration.


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