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From "Sidharta Seethana (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4599) Set OOM control for memory cgroups
Date Thu, 05 May 2016 02:11:12 GMT

    [ https://issues.apache.org/jira/browse/YARN-4599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15271794#comment-15271794

Sidharta Seethana commented on YARN-4599:

We are likely better off setting hard limit for all yarn containers so they don't interfere
anything else on the machine. We could disable OOM control on the cgroup corresponding to
all yarn containers (not including NM) and if all containers are paused, the NM can decide
what tasks to kill. This is particularly useful if we are oversubscribing the node.

[~kasha] By tasks, do you mean entire containers? How would the NM know which containers are
paused ? We would probably need to hook into the OOM notification mechanism for this. I am
not sure how well that works in practice.  That being said, it would be good to know that
the container got killed because of an OOM event - otherwise it would be pretty hard to debug
applications that run into this. (I think we might have hit this already with some internal
testing with the memory cgroup)

> Set OOM control for memory cgroups
> ----------------------------------
>                 Key: YARN-4599
>                 URL: https://issues.apache.org/jira/browse/YARN-4599
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.9.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: yarn-4599-not-so-useful.patch
> YARN-1856 adds memory cgroups enforcing support. We should also explicitly set OOM control
so that containers are not killed as soon as they go over their usage. Today, one could set
the swappiness to control this, but clusters with swap turned off exist.

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