[jira] [Commented] (YARN-7730) Add memory management configs to yarn-default

["Miklos Szegedi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-7730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16321685#comment-16321685 ] 

Miklos Szegedi commented on YARN-7730:
--------------------------------------

[~yeshavora], thank you for reporting this. Please review YARN-7064, the docs in question are being updated there together with adding additional configuration, so you might need to merge with this jira. I like the additional information, that you provided in the description. Please note that I think swappiness is not precisely the amount of memory that can be swapped out just the aggressiveness of the swapping algorithm.

> Add memory management configs to yarn-default
> ---------------------------------------------
>
>                 Key: YARN-7730
>                 URL: https://issues.apache.org/jira/browse/YARN-7730
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Yesha Vora
>            Priority: Minor
>
> Add below configuration and description to yarn-defaults.xml
> {code}
> "yarn.nodemanager.resource.memory.enabled"
> // the default value is false, we need to set to true here to enable the cgroups based memory monitoring.
> "yarn.nodemanager.resource.memory.cgroups.soft-limit-percentage"
> // the default value is 90.0f, which means in memory congestion case, the container can still keep/reserve 90% resource for its claimed value. It cannot be set to above 100 or set as negative value.
> "yarn.nodemanager.resource.memory.cgroups.swappiness"
> // The percentage that memory can be swapped or not. default value is 0, which means container memory cannot be swapped out. If not set, linux cgroup setting by default set to 60 which means 60% of memory can potentially be swapped out when system memory is not enough.{code}



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