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From "Sidharta Seethana (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2194) Cgroups cease to work in RHEL7
Date Thu, 18 Jun 2015 17:13:02 GMT

    [ https://issues.apache.org/jira/browse/YARN-2194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14592122#comment-14592122
] 

Sidharta Seethana commented on YARN-2194:
-----------------------------------------

[~ywskycn] ,  I see the following in the patch :

{code}
+++ hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/privileged/PrivilegedOperationExecutor.java
@@ -30,6 +30,7 @@
 import org.apache.hadoop.util.Shell.ExitCodeException;
 import org.apache.hadoop.yarn.api.ApplicationConstants;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.hadoop.yarn.server.nodemanager.LinuxContainerExecutor;
{code}

Please note that {{LinuxContainerExecutor}} already has a dependency on {{PrivilegedOperation}}
and indirectly on {{PrivilegedOperationExecutor}} ( via resource handlers ). It doesn't make
sense to add a dependency on {{LinuxContainerExecutor}} here - it makes it a circular dependency
of sorts. {{PrivilegedOperationExecutor}} is a wrapper around the container-executor binary
and the idea is move all invocations of container-executor to use this mechanism.  I recommend
instead adding this constant in {{PrivilegedOperation}} or {{PrivilegedOperationExecutor}}
as mentioned before. 


> Cgroups cease to work in RHEL7
> ------------------------------
>
>                 Key: YARN-2194
>                 URL: https://issues.apache.org/jira/browse/YARN-2194
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.7.0
>            Reporter: Wei Yan
>            Assignee: Wei Yan
>            Priority: Critical
>         Attachments: YARN-2194-1.patch, YARN-2194-2.patch, YARN-2194-3.patch, YARN-2194-4.patch,
YARN-2194-5.patch
>
>
> In RHEL7, the CPU controller is named "cpu,cpuacct". The comma in the controller name
leads to container launch failure. 
> RHEL7 deprecates libcgroup and recommends the user of systemd. However, systemd has certain
shortcomings as identified in this JIRA (see comments). 
> This JIRA only fixes the failure, and doesn't try to use systemd.



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