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From "Anubhav Dhoot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3119) Memory limit check need not be enforced unless aggregate usage of all containers is near limit
Date Mon, 02 Feb 2015 19:07:35 GMT

    [ https://issues.apache.org/jira/browse/YARN-3119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14301698#comment-14301698
] 

Anubhav Dhoot commented on YARN-3119:
-------------------------------------

Thanks [~leftnoteasy], [~aw] for your comments. All of the problems listed are already possible
with the current memory management model which uses monitoring and not cgroups.

> Memory limit check need not be enforced unless aggregate usage of all containers is near
limit
> ----------------------------------------------------------------------------------------------
>
>                 Key: YARN-3119
>                 URL: https://issues.apache.org/jira/browse/YARN-3119
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager
>            Reporter: Anubhav Dhoot
>            Assignee: Anubhav Dhoot
>         Attachments: YARN-3119.prelim.patch
>
>
> Today we kill any container preemptively even if the total usage of containers for that
is well within the limit for YARN. Instead if we enforce memory limit only if the total limit
of all containers is close to some configurable ratio of overall memory assigned to containers,
we can allow for flexibility in container memory usage without adverse effects. This is similar
in principle to how cgroups uses soft_limit_in_bytes.



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