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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5830) Avoid preempting AM containers
Date Tue, 03 Jan 2017 18:37:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-5830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15795778#comment-15795778

Karthik Kambatla commented on YARN-5830:

Discussed with Yufei offline. 

I have a couple of high-level concerns:
# When identifying a node and containers to preempt, the patch differentiates between a set
with AM containers and a set without. However, it doesn't look into the number of AM containers.

# The method {{identifyContainersToPreempt}} is too long and might benefit from more modularity.

One approach we discussed was to add a new method, {{identifyContainersToPreemptOnNode}} that
works on a single node and takes maximum number of allowed AM containers. 

> Avoid preempting AM containers
> ------------------------------
>                 Key: YARN-5830
>                 URL: https://issues.apache.org/jira/browse/YARN-5830
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: fairscheduler
>            Reporter: Karthik Kambatla
>            Assignee: Yufei Gu
>         Attachments: YARN-5830.001.patch, YARN-5830.002.patch
> While considering containers for preemption, avoid AM containers unless absolutely necessary.

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