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From "Miklos Szegedi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4599) Set OOM control for memory cgroups
Date Wed, 16 May 2018 20:10:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-4599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16478004#comment-16478004
] 

Miklos Szegedi commented on YARN-4599:
--------------------------------------

[~snemeth], thanks for the review.

oomHandlerTemp is necessary since we may throw an exception after we set it. An external code
optimized by JVM (setting a variable before the constructor is finished) may get a partial
copy of this object in case of the exception. It is better to set the fields after the exception
is not thrown.

3) This code has to be very fast do the same conversion for 1000s of containers potentially,
so I will keep the plainĀ multiplication instead of calling int external code that deals with
strings.

Ā 

> Set OOM control for memory cgroups
> ----------------------------------
>
>                 Key: YARN-4599
>                 URL: https://issues.apache.org/jira/browse/YARN-4599
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager
>    Affects Versions: 2.9.0
>            Reporter: Karthik Kambatla
>            Assignee: Miklos Szegedi
>            Priority: Major
>              Labels: oct16-medium
>         Attachments: Elastic Memory Control in YARN.pdf, YARN-4599.000.patch, YARN-4599.001.patch,
YARN-4599.002.patch, YARN-4599.003.patch, YARN-4599.004.patch, YARN-4599.005.patch, YARN-4599.006.patch,
YARN-4599.007.patch, YARN-4599.008.patch, YARN-4599.009.patch, YARN-4599.010.patch, YARN-4599.011.patch,
YARN-4599.sandflee.patch, 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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