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https://issues.apache.org/jira/browse/YARN-2022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14030143#comment-14030143
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Mayank Bansal commented on YARN-2022:
-------------------------------------
Hi [~vinodkv]
what you are saying make sense and I agree to that however I think we still
need this patch as that will ensure we are give least priority to kill AM's.
Thoughts?
[~sunilg] Thanks for the patch.
here are some high level comments
{code}
+ public static final String SKIP_AM_CONTAINER_FROM_PREEMPTION =
"yarn.resourcemanager.monitor.capacity.preemption.skip_am_container";
{code}
Please run the formatter , it doesn't seems to be the standard length of the
line
{code}
+ skipAMContainer = config.getBoolean(SKIP_AM_CONTAINER_FROM_PREEMPTION,
+ false);
{code}
By default it should be true, as we always wanted am to be least priority.
Did you run the test on the cluster?
Thanks,
Mayank
> Preempting an Application Master container can be kept as least priority when
> multiple applications are marked for preemption by
> ProportionalCapacityPreemptionPolicy
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-2022
> URL: https://issues.apache.org/jira/browse/YARN-2022
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: resourcemanager
> Affects Versions: 2.4.0
> Reporter: Sunil G
> Assignee: Sunil G
> Attachments: YARN-2022-DesignDraft.docx, YARN-2022.2.patch,
> YARN-2022.3.patch, YARN-2022.4.patch, Yarn-2022.1.patch
>
>
> Cluster Size = 16GB [2NM's]
> Queue A Capacity = 50%
> Queue B Capacity = 50%
> Consider there are 3 applications running in Queue A which has taken the full
> cluster capacity.
> J1 = 2GB AM + 1GB * 4 Maps
> J2 = 2GB AM + 1GB * 4 Maps
> J3 = 2GB AM + 1GB * 2 Maps
> Another Job J4 is submitted in Queue B [J4 needs a 2GB AM + 1GB * 2 Maps ].
> Currently in this scenario, Jobs J3 will get killed including its AM.
> It is better if AM can be given least priority among multiple applications.
> In this same scenario, map tasks from J3 and J2 can be preempted.
> Later when cluster is free, maps can be allocated to these Jobs.
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