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https://issues.apache.org/jira/browse/YARN-7715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16321730#comment-16321730
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Miklos Szegedi commented on YARN-7715:
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I would separate {{preStart}} into two functions, {{preStart}} and {{apply}}.
Both would get the container as a parameter. {{preStart}} would create the
cgroup and call {{apply}}. {{apply}} would set the cgroup settings based on the
current state of the cgroup.
> Update CPU and Memory cgroups params on container update as well.
> -----------------------------------------------------------------
>
> Key: YARN-7715
> URL: https://issues.apache.org/jira/browse/YARN-7715
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Arun Suresh
>
> In YARN-6673 and YARN-6674, the cgroups resource handlers update the cgroups
> params for the containers, based on opportunistic or guaranteed, in the
> *preStart* method.
> Now that YARN-5085 is in, Container executionType (as well as the cpu, memory
> and any other resources) can be updated after the container has started. This
> means we need the ability to change cgroups params after container start.
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